Clark heter is an industrial engineer at lyons products. he would like to determine whether there are more units produced on the night shift than on the day shift. the mean number of units produced by a sample of 54 day-shift workers was 331. the mean number of units produced by a sample of 60 night-shift workers was 338. assume the population standard deviation of the number of units produced on the day shift is 19 and 26 on the night shift. at the .01 significance level, is the number of units produced on the night shift larger?

Kevin has a spinner that has 10 equal sections and 2 sections of each color—red, blue, green, yellow, and purple. kevin spins the spinner 180 times. kevin determines about how many times the spinner will land on red or green, and his work is shown below. -kevin has the formula reversed; it should be the total number of sections over the number of red or green sections. -kevin should have used a 4 in the numerator because there are 2 red sections and 2 green sections. -kevin should multiply by the number of sections in the spinner rather than the total number of spins. -kevin calculated the prediction correctly and did not make any mistakes.