A. Reject the null hypothesis. Conclude that there is insufficient evidence that more than half of all voters prefer Democrats.


B. Do not reject the null hypothesis. Conclude that there is sufficient evidence that more than half of all voters prefer Democrats.


C. Reject the null hypothesis. Conclude that there is sufficient evidence that more than half of all voters prefer Democrats.


D. Do not reject the null hypothesis. Conclude that there is insufficient evidence that more than half of all voters prefer Democrats.

Question 2 of 40 
2.5 Points 
A. All games played by the team in question in which the attendance is over 4000


B. All future home games to be played by the team in question


C. All home games played by the team in question


D. None of the populations given are appropriate

Question 3 of 40 
2.5 Points 
In 1990, the average duration of longdistance telephone calls originating in one town was 9.4 minutes. A longdistance telephone company wants to perform a hypothesis test to determine whether the average duration of longdistance phone calls has changed from the 1990 mean of 9.4 minutes. The mean duration for a random sample of 50 calls originating in the town was 8.6 minutes. Does the data provide sufficient evidence to conclude that the mean call duration, µ, is different from the 1990 mean of 9.4 minutes? Perform the appropriate hypothesis test using a significance level of 0.01. Assume that s = 4.8 minutes.
A. With a z of 1.2 there is sufficient evidence to conclude that the mean
value has changed from the 1990 mean of 9.4 minutes. 

B. With a Pvalue of 0.2302 there is not sufficient evidence to conclude
that the mean value is less than the 1990 mean of 9.4 minutes. 

C. With a Pvalue of 0.2302 there is sufficient evidence to conclude that
the mean value is less than the 1990 mean of 9.4 minutes. 

D. With a z of –1.2 there is not sufficient evidence to conclude that the
mean value has changed from the 1990 mean of 9.4 minutes. 
Question 4 of 40 
2.5 Points 
A researcher wants to check the claim that convicted burglars spend an average of 18.7 months in jail. She takes a random sample of 35 such cases from court files and finds that months. Assume that the population standard deviation is 7 months. Test the null hypothesis that µ = 18.7 at the 0.05 significance level.
A.Do not reject the null hypothesis and conclude that the claim that the mean is different from 18.7 months is supported.


B.Do not reject the null hypothesis and conclude that the claim that the mean is different from 18.7 months cannot be supported.


C.Reject the null hypothesis and conclude that the claim that the mean is different from 18.7 months is supported.


D.Reject the null hypothesis and conclude that the claim that the mean is different from 18.7 months cannot be supported.

Question 5 of 40 
2.5 Points 
A. Since the test statistic is greater than the critical z, there is sufficient evidence to accept the null hypothesis and to support the claim that the mean content of acetaminophen is 600 mg.


B. Since the test statistic is greater than the critical z, there is sufficient evidence to reject the null hypothesis and to support the claim that the mean content of acetaminophen is not 600 mg.


C. Since the test statistic is less than the critical z, there is sufficient evidence to reject the null hypothesis and to support the claim that the mean content of acetaminophen is not 600 mg.


D. Since the test statistic is greater than the critical z, there is insufficient evidence to reject the null hypothesis and to support the claim that the mean content of acetaminophen is not 600 mg.

Question 6 of 40 
2.5 Points 
A. Conclusion: Support the claim that the mean is less than 9.4 minutes.


B. Conclusion: Support the claim that the mean is greater than 9.4 minutes.


C. Conclusion: Support the claim that the mean is equal to 9.4 minutes.


D. Conclusion: Do not support the claim that the mean is greater than 9.4 minutes.

Question 7 of 40 
2.5 Points 
A. There is sufficient evidence to support the claim that the true proportion is less than 29 percent.


B. There is not sufficient evidence to support the claim that the true proportion is greater than 29 percent.


C. There is sufficient evidence to support the claim that the true proportion is equal to 29 percent.


D. There is sufficient evidence to support the claim that the true proportion is greater than 29 percent.

Question 8 of 40 
2.5 Points 
The principal of a middle school claims that annual incomes of the families of the seventhgraders at his school vary more than the annual incomes of the families of the seventhgraders at a neighboring school, which have variation described by s = $13,700. Assume that a hypothesis test of the claim has been conducted and that the conclusion of the test was to reject the null hypothesis. Identify the population to which the results of the test apply.
A. The current seventh graders at the principal’s school


B. Seventh graders’ families at the school with a standard deviation of $13,700


C. All of the families of the class of seventh graders at the principal’s school


D. All seventh graders’ families

Question 9 of 40 
2.5 Points 
A. There is sufficient evidence to support the claim that the mean attendance is greater than 3000.


B. There is sufficient evidence to support the claim that the mean attendance is equal to 3000.


C. There is not sufficient evidence to support the claim that the mean attendance is greater than 3000.


D. There is not sufficient evidence to support the claim that the mean attendance is less than 3000.

Question 10 of 40 
2.5 Points 
A. Conclusion: Support the claim that the mean is equal to 16 ounces.


B. Conclusion: Support the claim that the mean is greater than 16 ounces.


C. Conclusion: Support the claim that the mean is not equal to 16 ounces.


D. Conclusion: Support the claim that the mean is less than 16 ounces.

Question 11 of 40 
2.5 Points 
In 1990, the average duration of longdistance telephone calls originating in one town was 9.3 minutes. A longdistance telephone company wants to perform a hypothesis test to determine whether the average duration of longdistance phone calls has changed from the 1990 mean of 9.3 minutes. Formulate the null and alternative hypotheses for the study described.
A.H_{o}: µ = 9.3 minutes H _{a} : µ < 9.3 minutes


B.H_{o}: µ = 9.3 minutes H _{a} : µ > 9.3 minutes


C.H_{o}: µ = 9.3 minutes H _{a} : µ ¹ 9.3 minutes


D.H_{o}: µ ¹ 9.3 minutes H _{a} : µ = 9.3 minutes

Question 12 of 40 
2.5 Points 
A. Do not reject the null hypothesis and conclude that there is evidence to support the claim that more than 1% of the DVDs are defective.


B. Reject the null hypothesis and conclude that there is insufficient evidence to support the claim that more than 1% of the DVDs are defective.


C. Do not reject the null hypothesis and conclude that there is insufficient evidence to support the claim that more than 1% of the DVDs are defective.


D. Reject the null hypothesis and conclude that there is sufficient evidence to support the claim that more than 1% of the DVDs are defective.

Part 1 of 2 – 
A study of a brand of “in the shell peanuts” gives the following results: A significant event at the 0.01 level is a fan getting a bag with how many peanuts?
without computing a Pvalue, determine whether the alternate hypothesis is supported and give a reason for your conclusion.
A righttailed test is conducted at the 5% significance level. Which of the following zscores is the smallest one in absolute value that leads to rejection of the null hypothesis?
