If 64% of a sample of 550 people leaving a shopping mall claims to have spent over $25. b) Determine the standard error and margin of error for a 90% confidence interval. c) Estimate the 90%...

If 64% of a sample of 550 people leaving a shopping mall claims to have spent over $25.

b) Determine the standard error and margin of error for a 90% confidence interval.

c) Estimate the 90% confidence interval for the proportion of shopping mall customers who spend over $25. Interpret.