**Chapter 9 Quiz | Complete Solution**

ch 9

Consider the following null and alternative hypotheses.

Ho: μ ≤ 67

Ha: μ > 67

These hypotheses _______________.

indicate a onetailed test with a rejection area in the right tail

indicate a onetailed test with a rejection area in the left tail

are not mutually exclusive

indicate a twotailed test

3 points

QUESTION 2

Suppose you are testing the null hypothesis that a population mean is greater than or equal to 60,

against the alternative hypothesis that the population mean is less than 60. The sample size is 64

and α = .05. If the sample mean is 58 and the population standard deviation is 16, the

observed z value is _______. (hint: you can use the Excel file for homework problem 9.7)

58

1

8

8

1

3 points

QUESTION 3

A researcher is testing a hypothesis of a single mean. The critical z value

for α= .05 and a two-tailed test is +1.96. The observed z value from sample

data is -1.85. The decision made by the researcher based on this information

is to _____ the null hypothesis. (hint: compare the observed z value to the

values of the two tailed test)

change the alternate hypothesis into

fail to reject

reject

redefine

restate the null hypothesis

3 points

QUESTION 4

In performing a hypothesis test where the null hypothesis is that the population mean is 23

against the alternative hypothesis that the population mean is not equal to 23, a random sample

of 17 items is selected. The sample mean is 24.6 and the sample standard deviation is 3.3. It can

be assumed that the population is normally distributed. The degrees of freedom associated with

this are _______.

17

2

1

15

16

3 points

QUESTION 5

In performing a hypothesis test where the null hypothesis is that the

population mean is 4.8 against the alternative hypothesis that the population

mean is not equal to 4.8, a random sample of 25 items is selected. The

sample mean is 4.1 and the sample standard deviation is 1.4. It can be

assumed that the population is normally distributed. The level of

significance is selected to be 0.10. The table "t" value for this problem is

_______. (hint: look up answer in table on p799 after calculating degrees of

freedom and alpha)

1.318

3.227

2.797

2.492

1.711

3 points

QUESTION 6

According to the following graphic , X and Y have _________.

strong negative correlation

virtually no correlation

weak negative correlation

strong positive correlation

moderate negative correlation

3 points

QUESTION 7

According to the following graphic, X and Y have _________.

moderate negative correlation

strong negative correlation

weak negative correlation

virtually no correlation

strong positive correlation

3 points

QUESTION 8

In the regression equation, y = 49.56 + 0.97x, the slope is _______

49.56

1.00

-0.97

0.97

0.00

3 points

QUESTION 9

In the regression equation, y = 54.78 + 1.45x, the intercept is _______

-1.45

1.45

54.78

-54.78

0.00

3 points

QUESTION 10

The following data is to be used to construct a regression model: (hint: use

INTERCEPT Excel function)

The value of the intercept is ________.

X

y

3

5

1.43

16.49

1.30

0.75

1.19

5

4

7

5

4

4

8

7

10

10

9

8

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