A manufacturer must test that his bolts are 1.00 cm long when they come off the assembly line. He must recalibrate his machines if the bolts are to long or too shortAfter sampling 49 randomly selected bolts off the assembly line, he calculates the sample mean to be 0.95 cm. He knows that the population standard deviation is 0.18 cm. Assuming a level of significance of 0.02is there sufficient evidence to show that the manufacturer needs to recalibrate the machines ? Step 2. Compute the value of statistic Step 3 draw conclusion and interpret the decision