The average and standard deviation of x-bar

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Reference no: EM132151260

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

Reference no: EM132151260

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