A random sample of 20 purchases showed the amounts in the table in $). The mean is $48.71 and the standard deviation is

[answerhappygod]

A Random Sample Of 20 Purchases Showed The Amounts In The Table In The Mean Is 48 71 And The Standard Deviation Is 1 (25.47 KiB) Viewed 78 times

A random sample of 20 purchases showed the amounts in the table in $). The mean is $48.71 and the standard deviation is $20.55. a) Construct a 98% confidence interval for the mean purchases of all customers, assuming that the assumptions and conditions for the confidence interval have been met b) How large is the margin of error? c) How would the confidence interval change if you had assumed that the population standard deviation was known to be $217 20.34 45.99 55,610 40.71 68.33 5568 4233 08.35 35.75 2253 84 39 56.13 63 48 49.78 88.77 63.98 32.45 38.46 25.85 1535 c) What is the confidence interval using the given population standard deviation? Select the correct choice below and fill in the answer boxes within your choice (Round to two decimal places as needed.) A The new confidence interval is narrower than the interval from parta B. The new confidence interval is wider than the interval from part a # ! . S VE More