Question

In a consumer research study, several Meijer and Walmart stores were surveyed at random and the average basket price was recorded for each. It was found that the average basket price for 9 Meijer stores was $132.43 with a standard deviation of $27.802. 12 Walmart stores had an average basket price of $152.44 with a standard deviation of $17.921. Construct a 99% confidence interval for the difference between the true average basket prices (Meijer - Walmart). You can assume that the standard deviations of the two populations are statistically similar. Question 8 options: 1) (-29.98, -10.04) 2) (-665.15, 625.13) 3) We only have the sample means, we need to know the population means in order to calculate a confidence interval. 4) (-45.7, 5.68) 5) (-48.54, 8.52)