Question

Question 35

I) Suppose that you randomly select a sample of 40 part-time journalists in January, and find that the sample pay per hour is £20.10 and the sample SD is £3.15. Compute a 95% confidence interval for the mean hourly pay of all of the part-time journalists in January, and then provide an interpretation of your interval.


II) Suppose that part-time journalists earn £17.84 per hour on average in July. Test if the data collected in Part I) suggest that the part-time journalists in January earn, on average, more than those working as part-time journalists in July. Do a hypothesis test given a 10% significance level to answer this, and then provide a conclusion.

Answer 1

Theory(only for understanding)

I used "u "as "x bar " and "x bar" as a "x"

Thank you