1 pt
DOK: 2

2.

A random sample of 7 students had the following scores on a quiz: 8 points; 9 points; 8 points; 6 points; 7 points; 6 points; 2 points. Which of the following is the best approximation of the standard deviation of the sample of quiz scores?

A

1.30 points

B

2.13 points

C

2.30 points

D

3.13 points

1 pt
DOK: 2

4.

A data set consists of 8 values and has a mean of 227.5 gallons. Seven of the data values are as follows: 120 gallons; 280 gallons; 215 gallons; 325 gallons; 200 gallons; 135 gallons; 305 gallons. What is the 8th data value in the set?

A

220 gallons

B

230 gallons

C

240 gallons

D

250 gallons

1 pt
DOK: 1

6.

Which of the following sets of numbers has a median of 42?

A

{60, 42, 37, 22, 19}

B

{16, 28, 42, 48}

C

{42, 64, 20}

D

{12, 42, 40, 50}

1 pt
DOK: 3

8.

You are told that the interval that is most likely to contain all the people who walk their dog every day is between 13.5% and 22.1%. What is the margin of error, and what sample size is needed to obtain that margin of error?

A

±4.3%; 32

B

±17.8%; 541

C

±4.3%; 541

D

±17.8%; 32

1 pt
DOK: 2

9.

In a recent survey of 160 people, 31% said that they spend at least $50 a day on everyday expenses. What is the margin of error for this survey?

A

about 7.91%

B

about 0.0079%

C

about 0.625%

D

about 14.20%