Suppose a randomly selected sample of n = 64 men has a mean foot length of)? = 26.8 cm, and the standard deviation of the sample is 2 cm. Calculate an approximate 95% condence interval for the mean foot length of men. (Round the answers to one decimal place.) to cm How much money do people spend on graduation gifts? In 2007, a federation surveyed 2815 consumers who reported that they bought one or more graduation gifts that year. The sample was selected in a way designed to produce a sample representative of adult Americans who purchased graduation gifts in 2007. For this sample, the mean amount spent per gift was $52.05. Suppose that the sample standard deviation was $20. Construct a 98% condence interval for the mean amount of money spent per graduation gift in 2007. (Round your answers to three decimal places.) ( , ) Interpret the interval. ' ' We are condent that the mean amount of money spent per graduation gift in 2007 was within this interval 98% of the time. " We are 98% condent that the mean amount of graduation money spent was within this interval. We are condent that 98% of the amount of money spent per graduation gift in 2007 was within this interval. We are 98% condent that the mean amount of money spent per graduation gift in 2007 was within this interval