{8,8} 0 {8,9} 0.5 {8,20} 6 {9,8} 0.5 {9,9} 0 {9,20} 5.5 {20,8} 6 {20,9} 5.5 {20,20} 0 (Type integers or decimals rounded to one decimal place as needed.) Calculate the mean of the sample mean absolute deviations. The mean of the sample mean absolute deviations is. (Type an integer or decimal rounded to one decimal place as needed.)

Can you redo the problem? I think the answer for part b should a number between 0 and 1

A manufacturer must test that his bolts are 4.00cm long when they come off the assembly line. He must recalibrate his machines if the bolts are too long or too short. After sampling 169 randomly selected bolts off the assembly line, he calculates the sample mean to be 4.07cm . He knows that the population standard deviation is 0.45cm . Assuming a level of significance of 0.02 , is there sufficient evidence to show that the manufacturer needs to recalibrate the machines? Step 2 of 3 : Compute the value of the test statistic. Round your answer to two decimal places.

This is part two of a question already asked. I have provided the answer sent, now there is a part 2 to the problem...its shown in picture 2.Part 2 is needed.