Unit Test: Modified

Name______Date______Class______

Statistical Models

Unit Test: Modified

Name______Date______Class______

How many females surveyed read more than 30 minutes per day?

A19

B56

C123

What is the joint relative frequency that a person surveyed likes jazz and country?

3.Suzanne had 100 people fill out a questionnaire about their favorite color. Of those people,45 of the respondents were male. Ten males said yellow was their favorite color. What was the conditional frequency that a participant’s favorite color is yellow, given the person is a male?

A0.10

B0.22

C0.45

4.Data set A has a correlation coefficient of and data set B has a correlation coefficient of 0.3. Which of the following statements is true?

AThe variables from set A have a strong negative correlation.

BThe variables from set A have a low negative correlation.

CThe variables from set B have a strong positive correlation.

5.Which correlation coefficient best matches the data on the scatterplot below?

A0.3

B0.6

6.What is the mean of the data set
{2, 2, 2, 3, 0, 5, 8, 3, 7, 10}?

A4.2

B10

C42

7.What is the outlier of the following set of data:8, 1, 6, 4, 0, 45, 3?

A8

C45

1[footer zone 1]

Name______Date______Class______

Statistical Models

Unit Test: Modified

Name______Date______Class______

8.The frequency table below shows the
ages and gender of the students at Morgan Middle School.

a.Complete the table.

Gender
Age / Male / Female / Total
10–11 / 105 / 98
12–13 / 90 / 102
14–15 / 95 / 110
Total

b.How many male students are 1213 years old?

______

c.In all, how many students are 1415years old?

______

d.Are there more males or females at Morgan Middle School? How many more?

______

9.The table shows the results of a survey of the primary mode of transportation of residents of East Palatka, Florida.

Bus / Bike / Car / Walking
118 / 75 / 147 / 60

a.How many residents were surveyed?

______

b.What is the relative frequency that a resident who was surveyed primarily bikes?

______

c.Thirty of the residents surveyed who ride a bike to work are males. What is the relative frequency that a person surveyed is a male, given that he rides a bike?

______

10.a.Complete the table.

s 2r 6
r / s(actual) / p(predicted) / residuals
1 / /
0 / /
1 / /
2 / 0 /

b.Find the sum of the squared residuals.

______

c.A second line of fit has a squared residual of 11. Which line is a better fit to the data?

______

11.Mariarecorded the following data for
the height, in inches, of students in her class:

{70, 68, 66, 61, 72, 67, 71, 62}

a.What is the median of the data?

______

b.What is the mean of the data?

______

6. D

7. a.

Gender
Age / Male / Female / Total
1314 / 82 / 108 / 190
1516 / 102 / 85 / 187
1718 / 63 / 98 / 161
1920 / 11 / 23 / 34
Total / 258 / 314 / 572

b. 187

c. 121

8. a. 0.28

c. 0.4

9. a. 10

3.75

b. The squared residual
is lower.

Unit 4 Test C

1. 20

2. 0.75

3. 0.72

4. A No B Yes C No D Yes

5. A No B Yes C Yes

7. a.

Gender
Age / Male / Female / Total
1827 / 10 / 5 / 15
2837 / 16 / 2 / 18
3847 / 18 / 10 / 28
4857 / 12 / 17 / 29
Total / 56 / 34 / 90

b. 28

c. 14 more 48- to 57-year-olds

8. a.

Bus / Bike / Car
Female / 20
/ 15
/ 30

Male / 12
/ 12
/ 36

b. 0.216

c. 0.6

9. a. 7.5

b. Possible answer The
squared residual is 3.75, which is
lower than 7.5.

10.a.

b. The scores of the students in the
afternoon class have a lower median
and a smaller interquartile range than
the scores fromthe morning class.

Unit 4 Test Modified

1. B

2. B

3. B

4. A

5. C

6. A

7. C

8. a.

Gender
Age / Male / Female / Total
1011 / 105 / 98 / 203
1213 / 90 / 102 / 192
1415 / 95 / 110 / 205
Total / 290 / 310 / 600

b. 90

c. 205

d. 20 more females

9. a. 400

b. 0.1875

c. 0.4

10.a.

r / s (actual) / p (predicted) / residuals
1 / / / 1
0 / / /
1 / / / 1
2 / 0 / / 2

b. 7

c. the first line of fit,

11.a. 67.125 in.

b. 67.5 in.

Unit 4 Performance Task

1. 60% of 100 students said they had a sister. 60%  100  60

2. Of the 60 students with a sister,
30% had a brother. 30%  60  18

3. There are 100 students altogether.
100  60  40

4. Of the 40 students who do not have a sister, 50% have a brother. 50%  40  20

5. The total of 60 includes 18 who have a brother. 60  18  42

Has a brother / Does not have a brother / TOTAL
Has a sister / 18 / 42 / 60
Does not have a sister / 20 / 20 / 40
TOTAL / 38 / 62 / 100

Has a brother / Does not have a brother / TOTAL
Has a sister / 18; 18% / 42; 42% / 60;  60%
Does not have a sister / 20;
 20% / 20;  20% / 40;  40%
TOTAL / 38;
 38% / 62;  62% / 100;
 100%

8. 20 percent of the people surveyed has a brother but does not have a sister.

9. The percentage is the higher of the two in the column. This means that those who have a brother are more likely to not have a sister.

UNIT 5 Linear Systems

Unit 5 Test A

1. D

2. (19, 14)

3. C

4. B

5. C

6. (0, 2)

7. 4 months

8. (2, 1)

1Holt McDougal Mathematics