Chapter 9 Quiz
In testing hypotheses, the researcher initially assumes:
the alternative hypothesis is true.
errors cannot be made.
the null hypothesis is true.
the population parameter of interest is known.
The probability of committing a Type I error is called:
the power of the test.
reliability.
the level of significance.
beta.
Which of the following is not one of the three types of hypotheses discussed in hypotheses
testing?
investigative hypotheses
substantive hypotheses
research hypotheses
statistical hypotheses
If a business researcher has a new theory about buying habits of consumers and wants to test it,
the new theory usually is formulated into the:
null hypothesis
critical value
alternative hypothesis
substantive hypothesis
Suppose the alternative hypothesis in a hypothesis test is "the population mean is greater than
65". If the sample size is 50 and alpha is .05, the critical value of z is:

1.96

1.645
1.9
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1.64
5
In a twotailed hypothesis about a population mean with a sample size of 100 and alpha is 0.10,
the rejection region is:
z > 1.645
z < 1.645 and z > 1.645
z > 1.28
z < 1.28 and z > 1.28
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 alpha is .05. If the sample mean is 58 and the population standard deviation is 16, the
observed z value is:

8.00

1.00

2.16
1.0
0
A business researcher has a theory that the average age of managers in a particular industry is
over 35 years old, and he wants to prove this. In conducting a statistical test on this theory, the
null hypothesis would be:
the population mean is ≥ 35
the population mean is > 35
the population mean is < 35
the population mean is = 35
A business researcher is conducting a twotailed test to determine if, on average, a shopper
spends $55.00 per visit at the grocery store. The researcher randomly samples 41 shoppers
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 Fall '10
 Black
 Statistics, Null hypothesis, Statistical hypothesis testing, researcher

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