We know if a histogram and stem and leaf plot of our quantitative data looks bell shaped and not too skewed or lopsided this is a good indicator for normality. We also know if mean = median or approximately close, this is a good sign of normality as well. Which of the below is false in regards to normality? a. skewness is between - 1 and 1
b. If skewness is less than -1 or greater than 1
c. If our komolgorov-smirnov's p-value < 0.05
d. If our komolgorov-smirnov's p-value > = 0.05

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.