Deck 10: Tests With Qualitative Data

Question 1

A survey of college students reported that in a sample of 384 males students, the average Construct a 90% confidence interval for the difference between men and women in the
Mean number of energy drinks consumed. Based on your results, is it reasonable to
Believe that the mean number of energy drinks consumed my be the same for both male
And female students?

A)No
B)Yes

Answer 1

A

Question 2

The following MINITAB output display presents a 95% confidence interval for the difference

Answer 2

C

Question 3

The concentration of hexane (a common solvent)was measured in units of micrograms It is reasonable to assume that both samples come from populations that are approximately
Normal. Construct a 99% confidence interval for the reduction of hexane concentration
After treatment.

A)(175.6, 180.8)
B)(175.1, 181.3)
C)(176.7, 179.7)
D)(170.9, 185.5)

Answer 3

D

Question 4

A computer software magazine compares the rates of malware infection for computers Assuming these to be random samples of infection rates for the two security software packages,
Construct a 98% confidence interval for the difference between the proportions of
Infection for the two types of security software packages. Does the confidence interval
Contradict the claim that the proportion of infections is the same for the two types of
Security software?

A)Yes
B)No

Question 5

The following display from a TI-84 Plus calculator presents a 95 % confidence interval for the difference between two means. The sample sizes are

How many degrees of freedom did the calculator use?

A) 15.229294
B) -0.549
C) 105.095
D) -35.082

Question 6

The following display from a TI-84 Plus calculator presents a 95% confidence interval for the

Question 7

Construct the confidence interval for the difference for the given level and values of
Level 98%:

A) (-0.084,0.288)
B) (-0.079,0.283)
C) (-0.062,0.266)
D) (-0.073,0.277)

Question 8

In an agricultural experiment,) Assume that the populations are approximately normal. Construct a 99% confidence interval for the difference between the mean yields for the two types of fertilizer. Based on your
Results, is it reasonable to conclude that the mean yields may be the same for fertilizers A
And B?

A)No
B)Yes

Question 9

The following MINITAB output display presents a 95% confidence interval for the difference

Question 10

A amateur golfer wishes to determine if there is a difference between the drive distances Assume that the populations are approximately normal. Construct a 95% confidence interval for the difference between the mean drive distances for the two drivers.

A)(-32.8, 18.2)
B)(-38.8, 24.1)
C)(-36.3, 21.9)
D)(-42.0, 27.3)

Question 11

In an agricultural experiment,)

Question 12

An amateur golfer wishes to determine if there is a difference between the drive Assume that the populations are approximately normal. Construct a 90% confidence interval for the difference between the mean drive distances for the two drivers. Based on your
Results, is it reasonable to conclude that the mean drive distances may be the same for
Drivers A and B?

A)No
B)Yes

Question 13

The following display from a TI-84 Plus calculator presents a 95 % confidence interval for the difference between two means. The sample sizes are

Compute the point estimate of

A) 48.498
B) -39.701
C) 105.575
D) -0.205

Question 14

The following MINITAB output display presents a 95% confidence interval for the difference

Question 15

The following display from a TI-84 Plus calculator presents a 95% confidence interval for the n

Question 16

A survey of college students reported that in a sample of 433 males students, the averagenumber of energy drinks consumed per month was 2.40 with a standard deviation of4.71, and in a sample of 63 female students, the average was 1.67 with a standarddeviation of 3.50.Construct a 98% confidence interval for the difference between men and women in themean number of energy drinks consumed.

A)(-0.53, 1.99)
B)(-9.61, 11.07)
C)(-0.38, 1.84)
D)(-0.49, 1.95)

Question 17

The following display from a TI-84 Plus calculator presents a 95% confidence interval for the difference between two means. The sample sizes are

Fill in the blanks: We are 95% confident that the difference between the means is between ____ and _____.

A) 111.710,127.190
B) 22.760,27.064
C) -34.165,3.205
D) 0,23.614386

Question 18

Construct the confidence interval for the difference for the given level and values of
Level 90% ,

A) (10.8,14.0)
B) (9.0,15.8)
C) (10.3,14.5)
D) (7.2,17.6)

Question 19

A computer software magazine compares the rates of malware infection for computers 28 out of 645 computers became infected after 1000 hours of internet interaction.
Assuming these to be random samples of infection rates for the two security software packages,
Construct a 95% confidence interval for the difference between the proportions of
Infection for the two types of security software packages.

A)(-0.028, 0.014)
B)(-0.025, 0.011)
C)(-0.027, 0.012)
D)(-0.029, 0.014)

Question 20

The following MINITAB output display presents a 95% confidence interval for the difference

Question 21

The following display from a TI-84 Plus calculator presents a 95% confidence interval for the

Question 22

Two microprocessors are compared on a sample of 6 benchmark codes to determine whether

Question 23

The following MINITAB output display presents a 95% confidence interval for the difference

Question 24

The following display from a TI-84 Plus calculator presents a 95% confidence interval

Question 25

The following output from MINITAB presents a confidence interval for the mean difference between matched pairs.

95 % CI for mean difference: (7.74239,9.78921)
Fill in the blanks: We are 95 % confident that the mean difference is between and

A) 6.5791,10.9525
B) 0,8.7658
C) 7.74239,9.78921
D) 0.488961,2.1867

Question 26

The following output from MINITAB presents a confidence interval for the mean differer between matched pairs.

95% CI for mean difference: (9.639447,12.773153)
What is the point estimate of

A) 11.2063
B) 17
C) 3.1508
D) 0.742651

Question 27

A group of six individuals with high cholesterol levels were given a new diet designed to lower A dietician claims that the mean reduction in cholesterol level is 50 milligrams per deciliter.
Does the 99% confidence interval contradict this claim? (Hint: you need to find the 99%
Confidence interval for the mean reduction in cholesterol level.)

A)Yes
B)No

Question 28

The following output from MINITAB presents a confidence interval for the mean differer between matched pairs.

95% CI for mean difference: (4.672247,8.894353)
How many degrees of freedom are there?

A) 4.1059
B) 16
C) 0.995827
D) 17

Question 29

A group of six individuals with high blood pressure volunteered to test whether petting cats for 10 A researcher claims that the mean reduction in systolic blood pressure is 11 mmHg. Does the 98% confidence interval contradict this claim? (Hint: you need to find the 98%
Confidence interval for the mean reduction in systolic blood pressure.)

A)Yes
B)No

Question 30

The following display from a TI-84 Plus calculator presents a 95% confidence interval for the

Question 31

A group of six individuals with high blood pressure volunteered to test whether petting cats for 10 Find the 98% confidence interval for the mean reduction in systolic blood pressure.

A)(0.05, 50.27)
B)(-3.90, 51.90)
C)(-2.27, -3.90)
D)(0.75, 47.25)

Question 32

Two microprocessors are compared on a sample of 6 benchmark codes to determine whether

Question 33

A group of six individuals with high cholesterol levels were given a new diet designed to lower Find the 95% confidence interval for the mean reduction in cholesterol level.

A)(12.87, 48.46)
B)(11.09, 9.85)
C)(11.98, 50.24)
D)(9.85, 51.49)