1. Men average 5’10” in height, with a standard deviation of 2”. If we take x-bars from groups of 10 men, what would be the average and standard deviation of x-bar?
a. 70, 0.2
b. 70, 0.63
c. 22.1, 0.2
d. 22.1, 0.63
2. An invoice has 7 different defects that it can contain. 400 invoices are checked and 80 defects are found. The DPU is
a. 80 / 400
b. 80 / (400 x 7)
c. 400 / 80
d. 80 / 7
3. An invoice has 7 different defects that it can contain. 400 invoices are checked and 80 defects are found. The defects per opportunity (DPO) is
a. 80 / 400
b. 80 / (400 x 7)
c. 400 / 80
d. 80 / 7
4. A large population is known to have a mean of 53 and a standard deviation of 5. 100 random samples, each of size 16, are selected. According to the Central Limit Theorem, the distribution of the 100 sample means has a mean of approximately
a. 53
b. 53 / SQRT(16)
c. 53 / SQRT(100)
d. 53 / SQRT(5)
5. For the regression line y = 12.2 + 7.8 x, 7.8 is the
a. correlation coefficient
b. r-squared
c. intercept
d. slope