A marketing research firm whishes to compare the prices charged by 2 supermarket chains - Publi's and Wally's . The research firm using a standardized one-week shopping plan (grocery lists, makes...

Extracted text: A marketing research firm whishes to compare the prices charged by 2 supermarket chains - Publi's and Wally's . The research firm using a standardized one-week shopping plan (grocery lists, makes identical purchases at 100 of each chain's stores. The stores for each chain are randomly selected, and all purchases are made durin a single week. It is reasonable to assume that the samples are independent. We are unwilling to assume that the population variances are equal. Weeky Expenses Publi's Average Weekly Expenses of the 100stores $120.92 Sample Variance $44.61 Wally's Average Weekly Expenses of the 100 stores $116.89 Sample Variance $64.32 At 95% confidence what is the margin of error (absolute value) If needed round your intermediate calculations to no more than 3 decimal places. Round your final answer to 3 decimal places.