Question

1.

What kind of measure are we looking for when we analyze a categorical variable?

Select one:

a. Proportion

b. Variance

c. Standard Deviation

d. Mean

2.

The amount of times (in seconds) needed to complete a critical task on an assembly line was measured for a sample of 200 assemblies. The data are summarized in the following cumulative percentage distribution.

Time (in Seconds)	Cumulative Percentage
Less than 15	6.5%
Less than 30	16.0%
Less than 45	25.0%
Less than 60	60.5%
Less than 75	79.0%
Less than 90	93.0%
Less than 105	100%

Most of the completion times in the sample fall on which interval?

Select one:

a. 60 but less than 75 seconds

b. 30 but less than 45 seconds

c. 90 but less than 105 seconds

d. 45 but less than 60 seconds

Answer 1

1). variance

2). D

Explanation:

1). for categorical variables we use variance to measure central tendency.

answer=variance

2).

here we have '

60-5-25=3.5% data is between 45 seconds and 60 seconds which is most , so the correct answer is

d. 45 but less than 60 seconds