Question 1 of 10

1

.0 Points

Consider the following scenario in answering questions 1 through 4

.Results from previous studies showed 79% of all high school seniors from a certain city plan to attend college after graduation

. A random sample of 200 high school seniors from this city reveals that 162 plan to attend college

. Does this indicate that the percentage has increased from that of previous studies? Test at the 5% level of significance

.State the null and alternative hypotheses

.A

. H0: µ =

.79, H1: µ >

.79

B

. H0: p =

.79, H1: p ?

.79

C

. H0: p ?

.79, H1: p >

.79

D

.:

0

=

.79, H1:

>

.79

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Question 2 of 10

1

.0 Points

Consider the following scenario in answering questions 1 through 4

.Results from previous studies showed 79% of all high school seniors from a certain city plan to attend college after graduation

. A random sample of 200 high school seniors from this city reveals that 162 plan to attend college

. Does this indicate that the percentage has increased from that of previous studies? Test at the 5% level of significance

.Compute the z or t value of the sample test statistic

.A

. z = 0

.69

B

. t = 1

.645

C

. z = 1

.96

D

. z = 0

.62

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Question 3 of 10

1

.0 Points

Consider the following scenario in answering questions 1 through 4

.Results from previous studies showed 79% of all high school seniors from a certain city plan to attend college after graduation

. A random sample of 200 high school seniors from this city reveals that 162 plan to attend college

. Does this indicate that the percentage has increased from that of previous studies? Test at the 5% level of significance

.What is your conclusion?

A

. Do not reject H0

. There is not enough evidence to support the claim that the proportion of students planning to go to college is greater than

.79

.B

. Reject H0

. There is enough evidence to support the claim that the proportion of students planning to go to college is now greater than

.79

.C

. Cannot determine

D

. More seniors are going to college

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Question 4 of 10

1

.0 Points

Consider the following scenario in answering questions 1 through 4

.Results from previous studies showed 79% of all high school seniors from a certain city plan to attend college after graduation

. A random sample of 200 high school seniors from this city reveals that 162 plan to attend college

. Does this indicate that the percentage has increased from that of previous studies? Test at the 5% level of significance

.What is the p-value associated with your test of hypothesis?

A

. 0

.7563

B

. 0

.6874

C

. 0

.4874

D

. 0

.2437

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Question 5 of 10

1

.0 Points

Consider the following scenario in answering questions 5 through 7

.In an article appearing in Today’s Health a writer states that the average number of calories in a serving of popcorn is 75

. To determine if the average number of calories in a serving of popcorn is different from 75, a nutritionist selected a random sample of 20 servings of popcorn and computed the sample mean number of calories per serving to be 78 with a sample standard deviation of 7

.State the null and alternative hypotheses

.A

. H0:

= 75, H1:

? 75

B

. H0:

75, H1:

> 75

C

. H0:

75, H1:

< 75

D

. H0:

= 75, H1:

> 75

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Question 6 of 10

1

.0 Points

Consider the following scenario in answering questions 5 through 7

.In an article appearing in Today’s Health a writer states that the average number of calories in a

serving of popcorn is 75

. To determine if the average number of calories in a serving of popcorn is

different from 75, a nutritionist selected a random sample of 20 servings of popcorn and computed

the sample mean number of calories per serving to be 78 with a sample standard deviation of 7

.Compute the z or t value of the sample test statistic

.A

. z = 1

.916

B

. t = -1

.916

C

. t = 1

.916

D

. z = 1

.645

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Question 7 of 10

1

.0 Points

Consider the following scenario in answering questions 5 through 7

.In an article appearing in Today’s Health a writer states that the average number of calories in a

serving of popcorn is 75

. To determine if the average number of calories in a serving of popcorn is

different from 75, a nutritionist selected a random sample of 20 servings of popcorn and computed

the sample mean number of calories per serving to be 78 with a sample standard deviation of 7

.At the ? =

.05 level of significance, does the nutritionist have enough evidence to reject the

writer’s claim?

A

. No

B

. Yes

C

. Cannot Determine

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Question 8 of 10

1

.0 Points

Consider the following in answering questions 8 through 10

.A lab technician is tested for her consistency by taking multiple measurements of cholesterol levels from the same blood sample

. The target accuracy is a variance in measurements of 1

.2 or less

. If the lab technician takes 16 measurements and the variance of the measurements in the sample is 2

.2, does this provide enough evidence to reject the claim that the lab technician’s accuracy is within the target

accuracy?

State the null and alternative hypotheses

.2

2

2

2

A

. H0: ? < 1

.2, H1: ? ? 1

.2

B

. H0: ? ? 1

.2, H1: ? > 1

.2

2

2

2

2

C

. H0: ? ? 1

.2, H1: ? = 1

.2

D

. H0: ? ? 1

.2, H1: ? ? 1

.2

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Question 9 of 10

1

.0 Points

Consider the following in answering questions 8 through 10

.A lab technician is tested for her consistency by taking multiple measurements of cholesterol levels from the same blood sample

. The target accuracy is a variance in measurements of 1

.2 or less

. If the lab technician takes 16 measurements and the variance of the measurements in the sample is 2

.2, does this provide enough evidence to reject the claim that the lab technician’s accuracy is within the target

accuracy?

Compute the value of the appropriate test statistic

.A

. t = 27

.50

B

. z = 1

.65

C

.D

.= 27

.50

= 30

.58

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Question 10 of 10

1

.0 Points

Consider the following in answering questions 8 through 10

.A lab technician is tested for her consistency by taking multiple measurements of cholesterol levels from the same blood sample

. The target accuracy is a variance in measurements of 1

.2 or less

. If the lab technician takes 16 measurements and the variance of the measurements in the sample is 2

.2, does this provide enough evidence to reject the claim that the lab technician’s accuracy is within the target

accuracy?

At the ? =

.01 level of significance, what is your conclusion?

A

. Do not reject H0

. At the

=

.01 level of significance there is not sufficient evidence to

suggest that this technician’s true variance is greater than the target accuracy

.B

. Reject H0

. At the

=

.01 level of significance, there is enough evidence to support

the claim that this technician’s variance is larger than the target accuracy

.C

. Cannot determine

D

.Reject H0

. At the

=

.01 level of significance, there is not enough evidence to support

the claim that this technician’s true variance is larger than the target accuracy

.