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Chapter 9 Quiz | Complete Solution
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ch 9
Consider the following null and alternative hypotheses.
Ho: μ ≤ 67
Ha: μ &gt; 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 &quot;t&quot; 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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