STAT-2160-950 - Business Statistics - Elearning - Western Michigan University

1/

The owner of a local supermarket wants to estimate the difference between the average number of gallons of milk sold per day on weekdays and weekends. The owner samples 22 weekdays and finds an average of 223.298 gallons of milk sold on those days with a standard deviation of 35.444. 27 Saturdays and Sundays are sampled and the average number of gallons sold is 364.648 with a standard deviation of 44.662. If a 95% confidence interval is calculated to estimate the difference between the average number of gallons sold on weekdays and weekends, what is the margin of error? Assume both population standard deviations are equal.

1) 2.012

2) 22.969

3) 19.664

4) 11.719

5) 23.579

Quiz Submissions - Quiz 1 - STAT-2160-950 - Business Statistics - Elearning - Western Michigan University

2/

customer wants to estimate the average delivery time of a pizza from the local pizza parlor. Over the course of a few months, the customer orders 27 pizzas and records the delivery times. The average delivery time is 28.83 with a standard deviation of 9.394. If the customer estimates the time using a 95% confidence interval, what is the margin of error?

1) 3.7095

2) 3.0835

3) 1.8079

Quiz Submissions - Quiz 1 - STAT-2160-950 - Business Statistics - Elearning - Western Michigan University

4) 0.8457

5) 3.7161

3/

Quiz Submissions - Quiz 1 - STAT-2160-950 - Business Statistics - Elearning - Western Michigan University

You own a small storefront retail business and are interested in determining the average amount of money a typical customer spends per visit to your store. You take a random sample over the course of a month for 27 customers and find that the average dollar amount spent per transaction per customer is $93.43 with a standard deviation of $12.9466. When creating a 99% confidence interval for the true average dollar amount spend per customer, what is the margin of error?

1) 6.9234

2) 6.9034

3) 2.4916

4) 6.1757

5) 1.1543

could you plz show me the way to solve this problem