A new grocery store has opened near you. You want to be 95 % sure to find a range within which your total weekly bill would lie. You took a sample of 55 individuals and asked them for their grocery bills and found that the average is $149.5 and the standard deviation for the sample is $25.5. Prepare a 95% confidence interval for the true weekly expenditure. If the confidence level is 95%, then error probability, i.e., =.05.