12D/13A/13B

Group Group 1 (Wikipedia) Group 2 (WebMD)
Sample size
Sample mean reading ease score
Sample standard deviation
Group Self-Monitor Group Fitness Tracker Group
Sample size 170 181
Sample mean weight loss 5.9 kg 3.5 kg
Sample standard deviation 3.5 kg 6.3 kg
Skill or Concept: I can . . . Questions to check your understanding Rating
from 1 to 5
Determine whether samples are independent or paired. 1, 2
Use information from independent samples to assess whether the assumptions/conditions for the two-sample t confidence interval are reasonably met. 3

Text that says "This is not hard to read (Arial font). This is hard to read (Mistral font)." Some tables and a graph. On the left is a heading reading “Descriptive Statistics.” Beneath this is a table with four columns, labeled “Group,” “Sample Size,” “Mean,” and “Standard Deviation.” The first row reads “Cell Phone” for group, 32 for sample size, 585.2 for mean, and 89.6 for standard deviation. The next row reads “NO Cell Phone” for group, 32 for sample size, 533.6 for mean, and 65.4 for standard deviation. Beneath this table is another heading reading “Estimate of Difference of Means,” with columns “Point Estimate,” “Standard Error,” and “Margin of Error.” For Point Estimate, it reads 51.6, for Standard Error, it reads 19.6, and for Margin of Error, it reads “plus or minus 39.3.” To the right is a graph labeled “Boxplot.” On the y-axis, it reads “Reaction Time (msec.).” For “Cell Phone,” the line begins at approximately 450 and extends to approximately 680, with the top of the box at approximately 610 and the bottom of the box at approximately 550. The middle line is at approximately 570. There is also a point at approximately 1000. For “No Cell Phone,” the line begins at approximately 425 and extends to approximately 650, with the top of the box at approximately 580 and the bottom at approximately 490. The middle line is at approximately 550.

Variable Description
country Country of cleanup
year Year (2019 or 2020)
parent_company Source of plastic
empty Category left empty count
hdpe High-density polyethylene count (plastic milk containers, plastic bags, bottle caps, trash cans, oil cans, plastic lumber, toolboxes, supplement containers)
Idpe Low-density polyethylene count (plastic bags, Ziploc bags, buckets, squeeze bottles, plastic tubes, chopping boards)
other_count Category marked other count
pet Polyester plastic count (polyester fibers, soft drink bottles, food containers [also see plastic bottles])
pp Polypropylene count (flower pots, bumpers, car interior trim, industrial fibers, carry-out beverage cups, microwavable food containers, DVD cases)
ps Polystyrene count (toys, video cassettes, ashtrays, trunks, beverage/food coolers, beer cups, wine and champagne cups, carry-out food containers, styrofoam)
pvc PVC plastic count (window frames, bottles for chemicals, flooring, plumbing pipes)
grand_total Grand total count (all types of plastic)
num_events Number of counting events
volunteers Number of volunteers
Skill or Concept: I can . . . Questions to check your understanding Rating
from 1 to 5
Calculate the mean and standard deviation of a variable. 1, 2
Create a histogram. 3
Describe the shape and spread of a histogram. 4
Describe null and alternative hypotheses. 5–8
Identify the difference between a one-tailed and two-tailed hypothesis test. 6, 7

NO ALT TEXT

A globe in the middle of a pile of garbage. A recycling symbol

A B C D E F G H
1 country year parent_company empty hdpe ldpe other_count pet
9502 Argentina 2020 The Coca-Cola Company 0 3 0 2 32
9588 Australia 2020 The Coca-Cola Company 0 3 3 17 37
9731 Bangladesh 2020 The Coca-Cola Company 0 0 0 0 66
9738 Benin 2020 The Coca-Cola Company 0 0 0 0 78
9757 Brazil 2020 The Coca-Cola Company 0 2 0 1 63
9774 Bulgaria 2020 The Coca-Cola Company 0 0 0 0 6
9788 Burkina Faso 2020 The Coca-Cola Company 0 0 0 0 204
9830 Canada 2020 The Coca-Cola Company 0 12 1 1 15
9943 Chile 2020 The Coca-Cola Company 0 0 2 0 119
2019 2020
Nestle Nestle
PepsiCo PepsiCo
Unilever
Mondelez International
Mars, Incorporated
Size Mean Standard Deviation
Sample 125 183.4 mg/dl 15
Skill or Concept: I can . . . Questions to check your understanding Rating
from 1 to 5
Identify the null and alternative hypotheses for a one-sample test for means. 1, 2
Identify that you collect sample data after stating the null and alternative hypotheses. 3, 4
Identify that you check test assumptions after collecting sample data. 5
Identify that you summarize the data using a test statistic after checking test assumptions. 6
Identify that you calculate a P-value after calculating the test statistic. 7
Identify that you interpret the test results in context after calculating the P-value. 8
independent samples
samples where one is selected from one population and another is independently selected from the second population.
paired samples
samples chosen in a way that results in the observations in one sample being paired with the observations in the other sample; also called dependent samples.