A random sample of 20 purchases showed the amounts in the table (in $). The mean...

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A random sample of 20 purchases showed the amounts in the table (in $). The mean is $50.03 and the standard deviation is $18.67. a) Construct a 90% 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 $19? 61.81 48.42 33.771 22.05 48.67 35.43 81.03 70.03 38.33 42.79 50.40 38.88 44.59 85.46 59.15 66.90 71.95 19.83 27.95 53.20 A random sample of 20 purchases showed the amounts in the table (in $). The mean is $50.03 and the standard deviation is $18.67. a) Construct a 90% 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 $19? 61.81 48.42 33.771 22.05 48.67 35.43 81.03 70.03 38.33 42.79 50.40 38.88 44.59 85.46 59.15 66.90 71.95 19.83 27.95 53.20

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Step 13 a confidence interval 5003 164518675003 16451867 1... View the full answer