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In a survey to estimate the mean time spent by office workers per day checking for and sending out e-mails, a random sample of 30 office workers were selected. The sample mean time spent checking for and sending out e-mails by the 30 office workers per day was reported to be 2 hours. Assumed that the population standard deviation of time spent checking for and sending out e-mails per day was 20 minutes i. Estimate the 95% confidence interval for the true mean time spent checking for and sending out e-mails per day by all the office workers. ii. What must be the minimum sample size so that the sampling eror of part (i) do not exceed 5 minutes at the 95°% confidence level?

In a survey to estimate the mean time spent by office workers per day checking for and sending out e-mails, a random sample of 30 office workers were selected. The sample mean time spent checking for and sending out e-mails by the 30 office workers per day was reported to be 2 hours. Assumed that the population standard deviation of time spent checking for and sending out e-mails per day was 20 minutes i. Estimate the 95% confidence interval for the true mean time spent checking for and sending out e-mails per day by all the office workers. ii. What must be the minimum sample size so that the sampling eror of part (i) do not exceed 5 minutes at the 95°% confidence level?

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
Section10.3: Measures Of Spread
Problem 1GP
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In a survey to estimate the mean time spent by office workers per day checking for and sending out e-mails, a random sample of 30 office workers were selected. The sample mean time spent checking for and sending out e-mails by the 30 office workers per day was reported to be 2 hours. Assumed that the population standard deviation of time spent checking for and sending out e-mails per day was 20 minutes a. i. Estimate the 95% confidence interval for the true mean time spent checking for and sending out e-mails per day by all the office workers. ii. What must be the minimum sample size so that the sampling error of part (i) do not exceed 5 mimutes at the 95% confidence level? !!
Transcribed Image Text:In a survey to estimate the mean time spent by office workers per day checking for and sending out e-mails, a random sample of 30 office workers were selected. The sample mean time spent checking for and sending out e-mails by the 30 office workers per day was reported to be 2 hours. Assumed that the population standard deviation of time spent checking for and sending out e-mails per day was 20 minutes a. i. Estimate the 95% confidence interval for the true mean time spent checking for and sending out e-mails per day by all the office workers. ii. What must be the minimum sample size so that the sampling error of part (i) do not exceed 5 mimutes at the 95% confidence level? !!
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