Question: 4. (10 points) Use the following R code and output to answer the questions below: > CPSSW8 %>% summarise(variance_of_earnings = mean((earnings - mean(earnings))^2)) variance_of_earnings 1

4. (10 points) Use the following R code and output to answer the questions below:

 > CPSSW8 %>% summarise(variance_of_earnings = mean((earnings - mean(earnings))^2)) variance_of_earnings 1 102.5579 > my_sample = CPSSW8 %>% sample_n(99) > my_sample %>% summarise(mean(earnings)) mean(earnings) 1 18.6656

(a) Test the null hypothesis that the average earnings in theCPSSW8data set is $20/hour. Use a two-sided test with a 5% significance level.

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