Question 1

Data is collected on the error rate in completing forms. Several new employees are hired and the error rate increases, then decreases over the month. A run chart of the daily error rate would most likely depict

Group of answer choices

Only common cause variation

Special cause variation reflected in a temporary shift of the data reflected in a run above the mean

Special cause variation reflected in a monthly cycle

Special cause variation reflected in a point outside of naturally defined bounds.

Question 2

The standard error of the means is the same as the sample standard deviation.

Group of answer choices

True

False

Question 3

A sample has a mean of 48and standard deviation of 2.1. If samples of size 4are taken the standard error of the means of the samples is

Group of answer choices

0.525

0.939

1.050

0.586

Question 4

A process has a mean of 108 and standard deviation of 3.5. Samples of size 10 have been taken for several months. To determine the proportion of the population that would have a value less than 100, you must

Group of answer choices

A. Recognize whether the problem is asking about sample means or individual values.

B. Calculate the standard error of the means where n=10.

C. Calculate Z=(100-108)/3.5

D. Find the sample probability

A and B

A and C

Question 5

A population has a mean of 496and standard deviation of 6. Samples of size 5 are taken from the population. What percent of the sample averages will be less than 500?

Group of answer choices

75%

82%

93%

58%