Problem 1: A program for reducing the number of days missed by food handlers in a certain restaurant chain was conducted

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Problem 1 A Program For Reducing The Number Of Days Missed By Food Handlers In A Certain Restaurant Chain Was Conducted 1 (158.26 KiB) Viewed 113 times

Problem 1: A program for reducing the number of days missed by food handlers in a certain restaurant chain was conducted. The owners hypothesized that after the program the workers would miss fewer days of work due to illness. The table shows the number of days 10 workers missed per month before and after completing the program. Before 2 3 4 5 3 1 0 0 After 1 4 3 8 3 3 1 0 1 0 a) Is there enough evidence to support the claim, at a = 0.05, that the food handlers missed fewer days after the program? b) Find the 90% confidence interval for the difference of the two means. Problem 2: In a sample of 80 Americans, 55% wished that they were rich. In a sample of 90 Europeans, 45% wished that they were rich. a) At a = 0.01, is there difference in the proportions? b) Find the 99% confidence interval for the differences of the two proportions. Problem 3: A researcher claims that the variation in the salaries of elementary school teachers is greater than the variation in the salaries of secondary school teachers. A sample of the salaries of 30 elementary school teachers has a variance of $8324, and a sample of the salaries of 30 secondary teacher schools has a variance of $2862. At a=0.05, can the researcher conclude that the variation in the elementary school teachers 'salaries is greater than the variation in the secondary teachers 'salaries?