Hannah wanted to investigate whether there was a difference in the time spent in the checkout line between two grocery stores in
a large city. She went to Grocery Store J on a Monday morning and recorded the time, in minutes, it took 30 customers to go through a checkout line. Then she went to Grocery Store K on Monday afternoon and recorded the time it took 30 customers to go through a checkout line. Hannah calculated the mean number of minutes for the customers in each line. She intends to conduct a two-sample tt-test for a difference in means between the two stores. Have all conditions for inference been met?
A. Yes, all conditions have been met.
B. No, the data were not collected using a random method.
C. No, the sample sizes are greater than 10 percent of the population.
D. NO, the sample sizes are not large enough to assume normality of the sampling distribution.
E. No, the distributions of the sample data are not approximately normal.
