Smbober 31557
MA 116 - Chapter 9 review
Name___________________________________
SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.
A hypothesis test is to be performed. Determine the null and alternative hypotheses.
1) A manufacturer claims that the mean amount of juice in its 16 ounce bottles is 16.1 ounces. A consumer advocacy group wants to perform a hypothesis test to determine whether the mean amount is actually less than this.
Classify the hypothesis test as two-tailed, left-tailed, or right-tailed.
2) At one school, the average amount of time that tenth-graders spend watching television each week is
21.6 hours. The principal introduces a campaign to encourage the students to watch less television. One year later, the principal wants to perform a hypothesis test to determine whether the average amount of time spent watching television per week has decreased from the previous mean of 21.6 hours.
Provide an appropriate response.
3) Jenny is conducting a hypothesis test concerning a population mean. The hypotheses are as follows.
H : m = 50
0
H : m > 50 a She selects a sample and finds that the sample mean is 54.2. She then does some calculations and is able to make the following statement:
If H were true, the chance that the sample mean would have come out as big ( or bigger) than 54.2 is 0.3. Do
0
you think that she should reject the null hypothesis? Why or why not?
The graph portrays the decision criterion for a hypothesis test for a population mean. The null hypothesis is H 0 : m = m .
0
The curve is the normal curve for the test statistic under the assumption that the null hypothesis is true. Use the graph to solve the problem.
4) A graphical display of the decision criterion follows.
Determine the rejection region.
1
Construct a graph portraying the decision criterion for the specified hypothesis test.
5) A hypothesis test for a population mean is conducted. The hypotheses are:
H :m= m
0
0
a
m0
H :m>
The
Name___________________________________
SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.
A hypothesis test is to be performed. Determine the null and alternative hypotheses.
1) A manufacturer claims that the mean amount of juice in its 16 ounce bottles is 16.1 ounces. A consumer advocacy group wants to perform a hypothesis test to determine whether the mean amount is actually less than this.
Classify the hypothesis test as two-tailed, left-tailed, or right-tailed.
2) At one school, the average amount of time that tenth-graders spend watching television each week is
21.6 hours. The principal introduces a campaign to encourage the students to watch less television. One year later, the principal wants to perform a hypothesis test to determine whether the average amount of time spent watching television per week has decreased from the previous mean of 21.6 hours.
Provide an appropriate response.
3) Jenny is conducting a hypothesis test concerning a population mean. The hypotheses are as follows.
H : m = 50
0
H : m > 50 a She selects a sample and finds that the sample mean is 54.2. She then does some calculations and is able to make the following statement:
If H were true, the chance that the sample mean would have come out as big ( or bigger) than 54.2 is 0.3. Do
0
you think that she should reject the null hypothesis? Why or why not?
The graph portrays the decision criterion for a hypothesis test for a population mean. The null hypothesis is H 0 : m = m .
0
The curve is the normal curve for the test statistic under the assumption that the null hypothesis is true. Use the graph to solve the problem.
4) A graphical display of the decision criterion follows.
Determine the rejection region.
1
Construct a graph portraying the decision criterion for the specified hypothesis test.
5) A hypothesis test for a population mean is conducted. The hypotheses are:
H :m= m
0
0
a
m0
H :m>
The