What you’ll learn to do: Conduct hypothesis tests for a difference in two population means and calculate and interpret Cohen’s d

People from California and from New York often complain about the price of gasoline being so high. Is there a statistically significant difference in the average price of gasoline for California and New York? To answer this question, you would need to conduct a two-sample t-test for a difference in population means with unknown standard deviations. Additionally, you will learn how to calculate Cohen’s d, which measures the relative strength of the differences between the means of two populations based on sample data.