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.

Solutions

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

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