AP Stat Quarter 1 Review

Male Female

teacher 200 600

engineer 400 400

What proportion of teachers i this sample are female?

• .60

• .75

• .375

• .50

Tags

CCSS.HSS.IC.B.4

CCSS.HSS.ID.B.5

Male Female

teacher 200 600

engineer 400 400

What proportion of males in this sample are engineers?

• .25

• .5

• .67

• .33

Tags

CCSS.7.RP.A.2

The standard deviation of a distribution is 2.4 m. What is the variance?

• 5.76 square m

• 5.76 m

• 1.5 square m

• 1.5 m

A sample of production records for an automobile manufacturer shows the following figures for production per shift.

705 700 690 705

What is the standard deviation of this sample?

• 8.2

• 49.4

• 7.07

• 701

Tags

CCSS.HSS.ID.A.2

According to the U.S. Bureau of Labor Statistics, the monthly percentage change in the number of jobs in a certain state for the twelve months of 2011 had a mean of 0.08% and a standard deviation of 1.70%. From this information we can conclude that

• the largest monthly change was 1.78%.

• the distribution of monthly changes is strongly skewed to the right.

• most of the monthly changes were negative.

• the magnitude of the monthly deviations from the mean change averaged about 1.70%.

A sample of 99 distances has a mean of 24 feet and a median of 24.5 feet. Unfortunately, it has just been discovered that the maximum value in the distribution, which was erroneously recorded as 40, actually had a value of 50. If we make this correction to the data, then

• the mean remains the same, but the median is increased.

• the mean and median remain the same.

• the median remains the same, but the mean is increased.

• the mean and median are both increased.

Tags

CCSS.HSS.ID.A.2

One hundred people work at Lagtime Internet Services. Suppose after a particularly successful year, the president of the company decided to double his own salary and not change anyone else’s. Assuming the president makes more than anyone else, which of the following statements about changes in measures of center and spread is true?

• The mean and standard deviation will increase, but the median and interquartile range will stay the same.

• The mean and interquartile range will increase, but the median and standard deviation will stay the same.

• The mean, standard deviation, and interquartile range will increase, but the median will stay the same.

• The mean will increase, but the median, standard deviation, and interquartile range will stay the same.

Tags

CCSS.HSS.ID.A.2

CCSS.HSS.ID.A.3

The five-number summary for scores on a statistics exam is 11, 35, 61, 70, 79. In all, 380 students took the test. About how many students had scores between 35 and 61?

• 26

• 76

• 95

• 190

The five-number summary of test scores for the 600 students in Mrs. Hughes’s Statistics class in Providence School is 52, 65, 78, 85, and 96. How many students scored higher than 65?

• 450

• 200

• 250

• not enough information

Here are the exam scores for the 14 students in Mrs. Novak’s statistics class:

60 61 61 65 72 75 75 78 81 81 85 89 91 98.

What is the percentile of the person whose score was 85?

• 67

• 45

• 85

• 79