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 34 meijer stores was $51.034 with a standard deviation of $10.784. similarly, 42 walmart stores had an average basket price of $58.923 with a standard deviation of $12.788. if a 90% confidence interval for the difference between the true average basket prices of meijer versus walmart is calculated, what is the margin of error? you can assume that the standard deviations of the two populations are statistically similar.