Download QUIZ 1 Answers File

Stat 202 Quiz 1 Answers
1. What is the probability of making a Type II error if the null hypothesis is actually true?
A. 
B. 1
C. 0
D. 0.05
2. For a two-tailed test with a 0.05 significance level, what is the rejection region when n is
large and the population standard deviation is known?
A. Between 1.96
B. Between 1.65
C. Greater than +1.96 and less than -1.96
D. Greater than +1.65 and less than -1.65
3. What is the level of significance?
A. Probability of a Type II error
B. Probability of a Type I error
C. z-value of 1.96
D. Beta error.
4. What do we call the statement that determines if the null hypothesis is rejected?
A. Decision rule
B. Test statistic
C. Alternate hypothesis
D. Critical value.
5. A hypothesis regarding the weight of newborn infants at a community hospital is that the
mean is 6.6 pounds. A sample of seven infants is randomly selected and their weights at birth
are recorded as 9.0, 7.3, 6.0, 8.8, 6.8, 8.4, and 6.6 pounds. What is the alternate hypothesis?
A. µ = 6.6
B. µ  6.6
C. µ  6.6
D. µ > 7.6.
6. For a hypothesis test with an alternative hypothesis: µ > 6,700, where is the rejection region
for the hypothesis test located?
A. Both tails
B. Left or lower tail
C. Right or upper tail
D. Center.
7. If the critical z-value for a test statistic equals 2.45, what value of the test statistic would
provide the least chance of making a Type I error?
A. 3.74
B. 10,000
C. 2.46
D. 4.56
8. Which of the following is NOT one of the five steps in the hypothesis testing procedure?
A. Formulate a decision rule
B. State the null and alternate hypotheses
C. Select a level for 
D. Identify the test statistic.
9. A hypothesis regarding the weight of newborn infants at a community hospital is that the
mean is 6.6 pounds. A sample of seven infants is randomly selected and their weights at birth
are recorded as 9.0, 7.3, 6.0, 8.8, 6.8, 8.4, and 6.6 pounds. What is the decision for a statistical
significant change in average weights at birth at the 5% level of significance?
A. Fail to reject the null hypothesis and conclude the mean is 6.6 lb.
B. Reject the null hypothesis and conclude the mean is higher than 6.6 lb.
C. Reject the null hypothesis and conclude the mean is lower than 6.6 lb.
D. Cannot calculate because population standard deviation is unknown.
10. A hypothesis regarding the weight of newborn infants at a community hospital is that the
mean is 6.6 pounds. A sample of seven infants is randomly selected and their weights at birth
are recorded as 9.0, 7.3, 6.0, 8.8, 6.8, 8.4, and 6.6 pounds. What is the decision for a
significant increase in the average birthrate at a 5% level of significance?
A. Fail to reject the null hypothesis and conclude the mean is 6.6 lb.
B. Reject the null hypothesis and conclude the mean is lower than 6.6 lb.
C. Reject the null hypothesis and conclude the mean is greater than 6.6 lb.
D. Cannot calculate because population standard deviation is unknown.
Time Allowed: 25 minutes.