4.) According to Expedia.com, workers in Italy lead the world in paid vacation days, averaging 42 days per year. The following data show the number of paid vacation days for a random sample of 20 Italian workers. 48 40 30 58 20 40 55 70 20 41 30 30 60 35 25 37 15 30 64 55 a.) Construct a 95% confidence interval to estimate the average number of paid vacation days for Italian workers. b.) Do the results from this sample validate Expedia.com's findings? C.) What assumptions need to be made about this population