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A manufacturer knows that the number of items produced per hour by machine A and by machine B are normally distributed with a standard deviation of 4.4 items for machine A and a standard deviation of 6.7 items for machine B. The mean hourly amount produced by machine A for a random sample of 54 hours was 226 units; the mean hourly amount produced by machine B for a random sample of 45 hours was 215 units. Find a 99% confidence interval for the difference in mean parts produced per hour by these two machines. t The confidence interval is

A manufacturer knows that the number of items produced per hour by machine A and by machine B are normally distributed with a standard deviation of 4.4 items for machine A and a standard deviation of 6.7 items for machine B. The mean hourly amount produced by machine A for a random sample of 54 hours was 226 units; the mean hourly amount produced by machine B for a random sample of 45 hours was 215 units. Find a 99% confidence interval for the difference in mean parts produced per hour by these two machines. t The confidence interval is

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.5: Comparing Sets Of Data
Problem 14PPS
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A manufacturer knows that the number of items produced per hour by machine A and by machine B are normally distributed with a standard deviation of 4.4 items for machine A and a standard deviation of 6.7 items for machine B. The mean hourly amount produced by machine A for a random sample of 54 hours was 226 units; the mean hourly amount produced by machine B for a random sample of 45 hours was 215 units. Find a 99% confidence interval for the difference in mean parts produced per hour by these two machines. ( The confidence interval is <Hx-Hy 1 (Round to four decimal places as needed) 1
Transcribed Image Text:A manufacturer knows that the number of items produced per hour by machine A and by machine B are normally distributed with a standard deviation of 4.4 items for machine A and a standard deviation of 6.7 items for machine B. The mean hourly amount produced by machine A for a random sample of 54 hours was 226 units; the mean hourly amount produced by machine B for a random sample of 45 hours was 215 units. Find a 99% confidence interval for the difference in mean parts produced per hour by these two machines. ( The confidence interval is <Hx-Hy 1 (Round to four decimal places as needed) 1
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