A survey of 300 office-based workers asked whether they accessed Facebook during working hours. 192 of...

A survey of 300 office-based workers asked whether they accessed Facebook during working hours. 192 of the workers said that they did not access Facebook.

a. Construct a 90% confidence interval of the proportion of office workers who do use Facebook.

b. Interpret the confidence interval.

c. If it is known that 30% of all office workers accessed Facebook during working hours last year, at the 1% level test whether there has been a significant change in

the proportion of office workers who access the site.

d. Is it possible that you have committed a Type I error in Part c? Explain.

Expert Solution

Type I error is reject Ho when it is true.

Here we reject Ho hence type 1 error occur here.

orchestra answered 1 year ago

In a Survey respondents were asked whether or not they had a Facebook account. Of men...

In a Survey respondents were asked whether or not they had a Facebook account. Of men 215 men, 70 had an active facebook profile, while 347 had 85 active profiles. Given that facebook has had an approximately 50 million users. A) Are these two population dependent or independent? Explain B)Find the point estimate for each population rounded to two decimals. C) Can we say that this is normally distributed data? why? D) Are there more males than females on facebook?...

A survey of 300 hospital workers is taken. The question asked is "Do you think that...

A survey of 300 hospital workers is taken. The question asked is "Do you think that staffing is adequate at your hospital, yes or no?" Perform the Chi-square test to determine if the frequency of no responses is statistically larger than the frequency of yes responses. The following responses were received: yes - 120, no - 180.

1. A survey of 436 workers showed that 192 of them said that it was seriously...

1. A survey of 436 workers showed that 192 of them said that it was seriously unethical for employers to monitor employee emails without their knowledge. When a random sample of 121 senior-level executives were surveyed, 40% of them agreed with the employees, Use a 5% significance level to test the claim that the proportion of employees that feel that monitoring employee emails is seriously unethical is greater than the proportion of executives that share this view. a. What is...

workers implication on reduced working hours

A survey question of men and women workers asked if they expected to receive a raise...

A survey question of men and women workers asked if they expected to receive a raise or promotion during the upcoming year. Two hundred men and 200 women were sampled. Of the men, 110 said yes but only 90 of the women said yes. Develop the hypotheses and test at 95% confidence to see if the percentage of women expecting to receive a raise or promotion is less than that of the men. What is your conclusion?

You are a supervisor in a government office. Your workers are upset because their work hours...

You are a supervisor in a government office. Your workers are upset because their work hours have recently been changed to 8:00am-4:30pm after two years of having flextime in place. Previously, employees were required to be in the office between 10:00am-2:30pm as core hours and could work the remaining part of their eight-hour day anytime between 6:00am and 7:00pm. Employees were free to manage their own time and you did not track their work hours. Everything appeared to be working...

In a survey, students are asked how many hours they in a typical week. A five...

In a survey, students are asked how many hours they in a typical week. A five number summary of the responses is 4,5,8,12,20. Which interval describes the number of hours spent studying in a typical week for about 25% of the students sampled?

A survey asked orchestra members to estimate the number of hours they practice on a typical...

A survey asked orchestra members to estimate the number of hours they practice on a typical day. From the results, it was determined that 25 pianists reported practicing an average of 4.1 hours a day with a standard deviation of 0.77, while 31 percussionists reported practicing an average of 3.7 hours a day with a standard deviation of 1.03. Using alpha = 0.05, test the claim that pianists practice longer than percussionists. d. t-test or z-test? Explain how you know....

A survey was conducted to determine whether hours of sleep per night are independent of age. A sample of individuals was asked to indicate the number of hours of sleep per night with categorical option

A survey was conducted to determine whether hours of sleep per night are independent of age. A sample of individuals was asked to indicate the number of hours of sleep per night with categorical options: fewer than 6 hours, 6 to 6.9 hours, 7 to 7.9 hours, and 8 hours or more. Later in the survey, the individuals were asked to indicate their age with categorical options: age 39 or younger and age 40 or older. Sample data follow....

In a class survey, students are asked how many hours they sleep per night. In the...

In a class survey, students are asked how many hours they sleep per night. In the random sample of 18 students, the (sample) mean is 6.8 hours with a (sample) standard deviation of 1.9 hours. We wish to know if this shows that the class’s student population on average has not gotten at least the recommended 8 hours of sleep at the α = .1 level. The distribution of sleep for this population follows a normal distribution. c) Please use...

Question