{"id":455,"date":"2021-07-30T16:58:25","date_gmt":"2021-07-30T16:58:25","guid":{"rendered":"https:\/\/courses.lumenlearning.com\/introstatscorequisite\/?post_type=chapter&#038;p=455"},"modified":"2022-01-31T20:05:52","modified_gmt":"2022-01-31T20:05:52","slug":"hypergeometric-distribution","status":"publish","type":"chapter","link":"https:\/\/courses.lumenlearning.com\/introstatscorequisite\/chapter\/hypergeometric-distribution\/","title":{"raw":"What are Hypergeometric Experiments?","rendered":"What are Hypergeometric Experiments?"},"content":{"raw":"<div class=\"textbox learning-objectives\">\r\n<h3>Learning Outcomes<\/h3>\r\n<ul>\r\n \t<li>Describe the five characteristics of a hypergeometric experiment<\/li>\r\n<\/ul>\r\n<\/div>\r\n<p id=\"element-408\" class=\" \">There are five characteristics of a <strong>hypergeometric experiment<\/strong>.<\/p>\r\n\r\n<ol id=\"element-999\">\r\n \t<li>You take samples from\u00a0<strong>two<\/strong>\u00a0groups.<\/li>\r\n \t<li>You are concerned with a group of interest, called the first group.<\/li>\r\n \t<li>You sample\u00a0<strong>without replacement<\/strong>\u00a0from the combined groups. For example, you want to choose a softball team from a combined group of 11 men and 13 women. The team consists of ten players.<\/li>\r\n \t<li>Each pick is\u00a0<strong>not<\/strong>\u00a0independent, since sampling is without replacement. In the softball example, the probability of picking a woman first is [latex]\\frac{13}{24}[\/latex]. The probability of picking a man second is [latex]\\frac{11}{23}[\/latex]\u00a0if a woman was picked first. It is [latex]\\frac{10}{23}[\/latex]\u00a0if a man was picked first. The probability of the second pick depends on what happened in the first pick.<\/li>\r\n \t<li>You are\u00a0<strong>not<\/strong>\u00a0dealing with Bernoulli Trials.<\/li>\r\n<\/ol>\r\n<p id=\"fs-idp102799616\" class=\" \">The outcomes of a hypergeometric experiment fit a\u00a0<span id=\"term107\" data-type=\"term\">hypergeometric probability<\/span>\u00a0distribution. The random variable\u00a0[latex]X[\/latex]\u00a0= the number of items from the group of interest.<\/p>\r\n\r\n<div class=\"textbox exercises\">\r\n<h3>example<\/h3>\r\nA candy dish contains 100 jelly beans and 80 gumdrops. Fifty candies are picked at random. What is the probability that 35 of the 50 are gumdrops? The two groups are jelly beans and gumdrops. Since the probability question asks for the probability of picking gumdrops, the group of interest (first group) is gumdrops. The size of the group of interest (first group) is 80. The size of the second group is 100. The size of the sample is 50 (jelly beans or gumdrops). Let\u00a0[latex]X[\/latex]\u00a0= the number of gumdrops in the sample of 50.\u00a0[latex]X[\/latex] takes on the values\u00a0[latex]x[\/latex]\u00a0= 0, 1, 2, ..., 50. What is the probability statement written mathematically?\r\n\r\n[reveal-answer q=\"23824\"]Show Answer[\/reveal-answer]\r\n[hidden-answer a=\"23824\"]\r\n\r\n[latex]P(x=35)[\/latex]\r\n\r\n[\/hidden-answer]\r\n\r\n<\/div>\r\n<div class=\"textbox key-takeaways\">\r\n<h3>try it<\/h3>\r\nA bag contains letter tiles. Forty-four of the tiles are vowels, and 56 are consonants. Seven tiles are picked at random. You want to know the probability that four of the seven tiles are vowels. What is the group of interest, the size of the group of interest, and the size of the sample?\r\n\r\n<\/div>\r\n<div class=\"textbox exercises\">\r\n<h3>example<\/h3>\r\nSuppose a shipment of 100 DVD players is known to have ten defective players. An inspector randomly chooses 12 for inspection. He is interested in determining the probability that, among the 12 players, at most two are defective. The two groups are the 90 non-defective DVD players and the 10 defective DVD players. The group of interest (first group) is the defective group because the probability question asks for the probability of at most two defective DVD players. The size of the sample is 12 DVD players. (They may be non-defective or defective.) Let\u00a0[latex]X[\/latex]\u00a0= the number of defective DVD players in the sample of 12. [latex]X[\/latex] takes on the values 0, 1, 2, ..., 10.\u00a0[latex]X[\/latex]\u00a0may not take on the values 11 or 12. The sample size is 12, but there are only 10 defective DVD players. Write the probability statement mathematically.\r\n\r\n[reveal-answer q=\"725624\"]Show Answer[\/reveal-answer]\r\n[hidden-answer a=\"725624\"]\r\n\r\n[latex]P(x\u22642)[\/latex]\r\n\r\n[\/hidden-answer]\r\n\r\n<\/div>\r\n<div class=\"textbox key-takeaways\">\r\n<h3>try it<\/h3>\r\nA gross of eggs contains 144 eggs. A particular gross is known to have 12 cracked eggs. An inspector randomly chooses 15 for inspection. She wants to know the probability that, among the 15, at most three are cracked. What is\u00a0[latex]X[\/latex], and what values does it take on?\r\n\r\n<\/div>\r\n<div class=\"textbox exercises\">\r\n<h3>example<\/h3>\r\n<p id=\"element-885\" class=\" \">You are president of an on-campus special events organization. You need a committee of seven students to plan a special birthday party for the president of the college. Your organization consists of 18 women and 15 men. You are interested in the number of men on your committee. If the members of the committee are randomly selected, what is the probability that your committee has more than four men?<\/p>\r\n<p id=\"element-990\" class=\" \">This is a hypergeometric problem because you are choosing your committee from two groups (men and women).<\/p>\r\n\r\n<div id=\"element-720\" class=\" unnumbered\" data-type=\"exercise\"><header><\/header><section>\r\n<div id=\"id43788540\" data-type=\"problem\">\r\n<div class=\"os-problem-container \">\r\n<p id=\"element-965\" class=\" \">a. Are you choosing with or without replacement?<\/p>\r\n<p id=\"element-356\" class=\" \">b. What is the group of interest?<\/p>\r\n<p id=\"element-378\" class=\" \">c. How many are in the group of interest?<\/p>\r\n<p id=\"element-730\" class=\" \">d. How many are in the other group?<\/p>\r\n<p id=\"element-304\" class=\" \">e. Let\u00a0[latex]X[\/latex]\u00a0= _________ on the committee. What values does\u00a0[latex]X[\/latex]\u00a0take on?<\/p>\r\n<p id=\"element-49\" class=\" \">f. The probability question is\u00a0[latex]P[\/latex](_______).<\/p>\r\n\r\n<\/div>\r\n[reveal-answer q=\"903035\"]Show Answer[\/reveal-answer]\r\n[hidden-answer a=\"903035\"]\r\n<p id=\"element-142\" class=\" \">a. without<\/p>\r\n&nbsp;\r\n<p id=\"element-80\" class=\" \">b. the men<\/p>\r\n&nbsp;\r\n<p id=\"element-597\" class=\" \">c. 15 men<\/p>\r\n&nbsp;\r\n<p id=\"element-465\" class=\" \">d. 18 women<\/p>\r\n&nbsp;\r\n<p id=\"element-529\" class=\" \">e. Let\u00a0[latex]X[\/latex]\u00a0=\u00a0<strong>the number of men<\/strong>\u00a0on the committee.\u00a0[latex]x[\/latex]\u00a0= 0, 1, 2, \u2026, 7.<\/p>\r\n&nbsp;\r\n<p id=\"element-0836\" class=\" \">f. [latex]P(x&gt;4)[\/latex]<\/p>\r\n[\/hidden-answer]\r\n\r\n<\/div>\r\n<\/section><\/div>\r\n<\/div>\r\n<div class=\"textbox key-takeaways\">\r\n<h3>try it<\/h3>\r\nA palette has 200 milk cartons. Of the 200 cartons, it is known that ten of them have leaked and cannot be sold. A stock clerk randomly chooses 18 for inspection. He wants to know the probability that among the 18, no more than two are leaking. Give five reasons why this is a hypergeometric problem.\r\n\r\n<\/div>","rendered":"<div class=\"textbox learning-objectives\">\n<h3>Learning Outcomes<\/h3>\n<ul>\n<li>Describe the five characteristics of a hypergeometric experiment<\/li>\n<\/ul>\n<\/div>\n<p id=\"element-408\" class=\"\">There are five characteristics of a <strong>hypergeometric experiment<\/strong>.<\/p>\n<ol id=\"element-999\">\n<li>You take samples from\u00a0<strong>two<\/strong>\u00a0groups.<\/li>\n<li>You are concerned with a group of interest, called the first group.<\/li>\n<li>You sample\u00a0<strong>without replacement<\/strong>\u00a0from the combined groups. For example, you want to choose a softball team from a combined group of 11 men and 13 women. The team consists of ten players.<\/li>\n<li>Each pick is\u00a0<strong>not<\/strong>\u00a0independent, since sampling is without replacement. In the softball example, the probability of picking a woman first is [latex]\\frac{13}{24}[\/latex]. The probability of picking a man second is [latex]\\frac{11}{23}[\/latex]\u00a0if a woman was picked first. It is [latex]\\frac{10}{23}[\/latex]\u00a0if a man was picked first. The probability of the second pick depends on what happened in the first pick.<\/li>\n<li>You are\u00a0<strong>not<\/strong>\u00a0dealing with Bernoulli Trials.<\/li>\n<\/ol>\n<p id=\"fs-idp102799616\" class=\"\">The outcomes of a hypergeometric experiment fit a\u00a0<span id=\"term107\" data-type=\"term\">hypergeometric probability<\/span>\u00a0distribution. The random variable\u00a0[latex]X[\/latex]\u00a0= the number of items from the group of interest.<\/p>\n<div class=\"textbox exercises\">\n<h3>example<\/h3>\n<p>A candy dish contains 100 jelly beans and 80 gumdrops. Fifty candies are picked at random. What is the probability that 35 of the 50 are gumdrops? The two groups are jelly beans and gumdrops. Since the probability question asks for the probability of picking gumdrops, the group of interest (first group) is gumdrops. The size of the group of interest (first group) is 80. The size of the second group is 100. The size of the sample is 50 (jelly beans or gumdrops). Let\u00a0[latex]X[\/latex]\u00a0= the number of gumdrops in the sample of 50.\u00a0[latex]X[\/latex] takes on the values\u00a0[latex]x[\/latex]\u00a0= 0, 1, 2, &#8230;, 50. What is the probability statement written mathematically?<\/p>\n<div class=\"qa-wrapper\" style=\"display: block\"><span class=\"show-answer collapsed\" style=\"cursor: pointer\" data-target=\"q23824\">Show Answer<\/span><\/p>\n<div id=\"q23824\" class=\"hidden-answer\" style=\"display: none\">\n<p>[latex]P(x=35)[\/latex]<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"textbox key-takeaways\">\n<h3>try it<\/h3>\n<p>A bag contains letter tiles. Forty-four of the tiles are vowels, and 56 are consonants. Seven tiles are picked at random. You want to know the probability that four of the seven tiles are vowels. What is the group of interest, the size of the group of interest, and the size of the sample?<\/p>\n<\/div>\n<div class=\"textbox exercises\">\n<h3>example<\/h3>\n<p>Suppose a shipment of 100 DVD players is known to have ten defective players. An inspector randomly chooses 12 for inspection. He is interested in determining the probability that, among the 12 players, at most two are defective. The two groups are the 90 non-defective DVD players and the 10 defective DVD players. The group of interest (first group) is the defective group because the probability question asks for the probability of at most two defective DVD players. The size of the sample is 12 DVD players. (They may be non-defective or defective.) Let\u00a0[latex]X[\/latex]\u00a0= the number of defective DVD players in the sample of 12. [latex]X[\/latex] takes on the values 0, 1, 2, &#8230;, 10.\u00a0[latex]X[\/latex]\u00a0may not take on the values 11 or 12. The sample size is 12, but there are only 10 defective DVD players. Write the probability statement mathematically.<\/p>\n<div class=\"qa-wrapper\" style=\"display: block\"><span class=\"show-answer collapsed\" style=\"cursor: pointer\" data-target=\"q725624\">Show Answer<\/span><\/p>\n<div id=\"q725624\" class=\"hidden-answer\" style=\"display: none\">\n<p>[latex]P(x\u22642)[\/latex]<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"textbox key-takeaways\">\n<h3>try it<\/h3>\n<p>A gross of eggs contains 144 eggs. A particular gross is known to have 12 cracked eggs. An inspector randomly chooses 15 for inspection. She wants to know the probability that, among the 15, at most three are cracked. What is\u00a0[latex]X[\/latex], and what values does it take on?<\/p>\n<\/div>\n<div class=\"textbox exercises\">\n<h3>example<\/h3>\n<p id=\"element-885\" class=\"\">You are president of an on-campus special events organization. You need a committee of seven students to plan a special birthday party for the president of the college. Your organization consists of 18 women and 15 men. You are interested in the number of men on your committee. If the members of the committee are randomly selected, what is the probability that your committee has more than four men?<\/p>\n<p id=\"element-990\" class=\"\">This is a hypergeometric problem because you are choosing your committee from two groups (men and women).<\/p>\n<div id=\"element-720\" class=\"unnumbered\" data-type=\"exercise\">\n<header><\/header>\n<section>\n<div id=\"id43788540\" data-type=\"problem\">\n<div class=\"os-problem-container\">\n<p id=\"element-965\" class=\"\">a. Are you choosing with or without replacement?<\/p>\n<p id=\"element-356\" class=\"\">b. What is the group of interest?<\/p>\n<p id=\"element-378\" class=\"\">c. How many are in the group of interest?<\/p>\n<p id=\"element-730\" class=\"\">d. How many are in the other group?<\/p>\n<p id=\"element-304\" class=\"\">e. Let\u00a0[latex]X[\/latex]\u00a0= _________ on the committee. What values does\u00a0[latex]X[\/latex]\u00a0take on?<\/p>\n<p id=\"element-49\" class=\"\">f. The probability question is\u00a0[latex]P[\/latex](_______).<\/p>\n<\/div>\n<div class=\"qa-wrapper\" style=\"display: block\"><span class=\"show-answer collapsed\" style=\"cursor: pointer\" data-target=\"q903035\">Show Answer<\/span><\/p>\n<div id=\"q903035\" class=\"hidden-answer\" style=\"display: none\">\n<p id=\"element-142\" class=\"\">a. without<\/p>\n<p>&nbsp;<\/p>\n<p id=\"element-80\" class=\"\">b. the men<\/p>\n<p>&nbsp;<\/p>\n<p id=\"element-597\" class=\"\">c. 15 men<\/p>\n<p>&nbsp;<\/p>\n<p id=\"element-465\" class=\"\">d. 18 women<\/p>\n<p>&nbsp;<\/p>\n<p id=\"element-529\" class=\"\">e. Let\u00a0[latex]X[\/latex]\u00a0=\u00a0<strong>the number of men<\/strong>\u00a0on the committee.\u00a0[latex]x[\/latex]\u00a0= 0, 1, 2, \u2026, 7.<\/p>\n<p>&nbsp;<\/p>\n<p id=\"element-0836\" class=\"\">f. [latex]P(x>4)[\/latex]<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n<\/div>\n<\/div>\n<div class=\"textbox key-takeaways\">\n<h3>try it<\/h3>\n<p>A palette has 200 milk cartons. Of the 200 cartons, it is known that ten of them have leaked and cannot be sold. A stock clerk randomly chooses 18 for inspection. He wants to know the probability that among the 18, no more than two are leaking. Give five reasons why this is a hypergeometric problem.<\/p>\n<\/div>\n\n\t\t\t <section class=\"citations-section\" role=\"contentinfo\">\n\t\t\t <h3>Candela Citations<\/h3>\n\t\t\t\t\t <div>\n\t\t\t\t\t\t <div id=\"citation-list-455\">\n\t\t\t\t\t\t\t <div class=\"licensing\"><div class=\"license-attribution-dropdown-subheading\">CC licensed content, Shared previously<\/div><ul class=\"citation-list\"><li>Hypergeometric Distribution. <strong>Provided by<\/strong>: OpenStax. <strong>Located at<\/strong>: <a target=\"_blank\" href=\"https:\/\/openstax.org\/books\/introductory-statistics\/pages\/4-5-hypergeometric-distribution\">https:\/\/openstax.org\/books\/introductory-statistics\/pages\/4-5-hypergeometric-distribution<\/a>. <strong>License<\/strong>: <em><a target=\"_blank\" rel=\"license\" href=\"https:\/\/creativecommons.org\/licenses\/by\/4.0\/\">CC BY: Attribution<\/a><\/em>. <strong>License Terms<\/strong>: Access for free at https:\/\/openstax.org\/books\/introductory-statistics\/pages\/1-introduction<\/li><\/ul><\/div>\n\t\t\t\t\t\t <\/div>\n\t\t\t\t\t <\/div>\n\t\t\t <\/section>","protected":false},"author":169134,"menu_order":22,"template":"","meta":{"_candela_citation":"[{\"type\":\"cc\",\"description\":\"Hypergeometric Distribution\",\"author\":\"\",\"organization\":\"OpenStax\",\"url\":\"https:\/\/openstax.org\/books\/introductory-statistics\/pages\/4-5-hypergeometric-distribution\",\"project\":\"\",\"license\":\"cc-by\",\"license_terms\":\"Access for free at https:\/\/openstax.org\/books\/introductory-statistics\/pages\/1-introduction\"}]","CANDELA_OUTCOMES_GUID":"","pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":[],"pb_section_license":""},"chapter-type":[],"contributor":[],"license":[],"class_list":["post-455","chapter","type-chapter","status-publish","hentry"],"part":240,"_links":{"self":[{"href":"https:\/\/courses.lumenlearning.com\/introstatscorequisite\/wp-json\/pressbooks\/v2\/chapters\/455","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/courses.lumenlearning.com\/introstatscorequisite\/wp-json\/pressbooks\/v2\/chapters"}],"about":[{"href":"https:\/\/courses.lumenlearning.com\/introstatscorequisite\/wp-json\/wp\/v2\/types\/chapter"}],"author":[{"embeddable":true,"href":"https:\/\/courses.lumenlearning.com\/introstatscorequisite\/wp-json\/wp\/v2\/users\/169134"}],"version-history":[{"count":16,"href":"https:\/\/courses.lumenlearning.com\/introstatscorequisite\/wp-json\/pressbooks\/v2\/chapters\/455\/revisions"}],"predecessor-version":[{"id":3594,"href":"https:\/\/courses.lumenlearning.com\/introstatscorequisite\/wp-json\/pressbooks\/v2\/chapters\/455\/revisions\/3594"}],"part":[{"href":"https:\/\/courses.lumenlearning.com\/introstatscorequisite\/wp-json\/pressbooks\/v2\/parts\/240"}],"metadata":[{"href":"https:\/\/courses.lumenlearning.com\/introstatscorequisite\/wp-json\/pressbooks\/v2\/chapters\/455\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/courses.lumenlearning.com\/introstatscorequisite\/wp-json\/wp\/v2\/media?parent=455"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/courses.lumenlearning.com\/introstatscorequisite\/wp-json\/pressbooks\/v2\/chapter-type?post=455"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/courses.lumenlearning.com\/introstatscorequisite\/wp-json\/wp\/v2\/contributor?post=455"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/courses.lumenlearning.com\/introstatscorequisite\/wp-json\/wp\/v2\/license?post=455"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}