5. A consumer group is trying to determine the mean amount that a family of four spends on food per week. They perform a phone survey of 300 random families of four and find a sample mean of $241.50 with a
standard deviation of $46.72.
(a) Determine an estimate for the standard (b) What is the margin of error for the mean
deviation of the sample means, O. Show your amount spent on food per week?
calculation.