10. ___ is the probability of accepting a false null hypothesis. a. 1- b. c. d.1
ID: 3129021 • Letter: 1
Question
10. ___ is the probability of accepting a false null hypothesis.
a. 1-
b.
c.
d.1-
e. None
11. Significance level is equal to:
a.
b.
c. 1-
d. 1- e. None
12. A professor wanted to test all possible pairwise comparisons among five means. How many comparisons did he need to compare?
a.5
b.6
c. 10
d. 15
e. None
13. A researcher wanted to compare the blood sugar level before and after breakfast among the same population. There were 100 participants in this study. The researcher measured their blood sugar level 30 minutes before breakfast and then he measured their blood sugar level again 30 minutes after breakfast. If he wanted to compare the mean blood sugar before and after breakfast by using a two-tailed t test, how many degrees of freedom were there?
a. 99
b. 100
c. 199
d. 200
e. None
14. Power is defined as ____
a.
b. 1-
c. 1- d.
e. None
15. 1-istheprobabilityof_______
a. Rejecting a true null hypothesis
b. Accepting a true null hypothesis
c. Accepting a false null hypothesis
d. Rejecting a false null hypothesis
e. None
Page 3 of 10
16. Over the past few decades, public health officials have examined the link between weight concerns and teen girls' smoking. Researchers surveyed a group of 273 randomly selected teen girls living in Massachusetts (between 12 and 15 years old). After four years the girls were surveyed again. Sixty-three said they smoked to stay thin. Is there good evidence that more than thirty percent of the teen girls smoke to stay thin? The alternative hypothesis is:
a.p<0.30
b.p0.30
c.p0.30
d.p>0.30
e. None
17. A statistics instructor believes that fewer than 20% of Evergreen Valley College (EVC) students attended the opening midnight showing of the latest Harry Potter movie. She surveys 84 of her students and finds that 11 of them attended the midnight showing. The Type I error is to conclude that the percent of EVC students who attended is ________.
a. at least 20%, when in fact, it is less than 20%.
b. 20%, when in fact, it is 20%.
c. less than 20%, when in fact, it is at least 20%.
d. less than 20%, when in fact, it is less than 20%.
e. None
18. Previously, an organization reported that teenagers spent 4.5 hours per week, on average, on the phone. The organization thinks that, currently, the mean is higher. Fifteen randomly chosen teenagers were asked how many hours per week they spend on the phone. The sample mean was 4.75 hours with a sample standard deviation of 2.0. Conduct a hypothesis test.
The null and alternative hypotheses are:
a.Ho: x =4.5,Ha : x >4.5
b.Ho :4.5,Ha :<4.5
c.Ho :=4.75,Ha :>4.75
d.Ho :=4.5Ha :>4.5
e. None
19. Suppose a statistics instructor believes that there is no significant difference between the mean class scores of statistics day students on Exam 2 and statistics night students on Exam 2. She takes random samples from each of the populations. The mean and standard deviation for 35 statistics day students were 75.86 and 16.91, respectively. The mean and standard deviation for 37 statistics night students were 75.41 and 19.73. The “day” subscript refers to the statistics day students. The “night” subscript refers to the statistics night students. An appropriate alternative hypothesis for the hypothesis test is:
a. day > night
b. day < night
c. day = night
d. day = night
e. None
Explanation / Answer
10. ___ is the probability of accepting a false null hypothesis.
a. 1-
b.
c.
d.1-
e. None
11. Significance level is equal to:
a.
b.
c. 1-
d. 1- e. None
12. A professor wanted to test all possible pairwise comparisons among five means. How many comparisons did he need to compare?
a.5
b.6
c. 10
d. 15
e. None
5*4/2=10
13. A researcher wanted to compare the blood sugar level before and after breakfast among the same population. There were 100 participants in this study. The researcher measured their blood sugar level 30 minutes before breakfast and then he measured their blood sugar level again 30 minutes after breakfast. If he wanted to compare the mean blood sugar before and after breakfast by using a two-tailed t test, how many degrees of freedom were there?
a. 99
b. 100
c. 199
d. 200
e. None
DF=n-1=100-1=99
14. Power is defined as ____
a.
b. 1-
c. 1-
d.
e. None
15. 1- is the probabilityof_______
a. Rejecting a true null hypothesis
b. Accepting a true null hypothesis
c. Accepting a false null hypothesis
d. Rejecting a false null hypothesis
e. None
Page 3 of 10
16. Over the past few decades, public health officials have examined the link between weight concerns and teen girls' smoking. Researchers surveyed a group of 273 randomly selected teen girls living in Massachusetts (between 12 and 15 years old). After four years the girls were surveyed again. Sixty-three said they smoked to stay thin. Is there good evidence that more than thirty percent of the teen girls smoke to stay thin? The alternative hypothesis is:
a.p<0.30
b.p0.30
c.p0.30
d.p>0.30
e. None
17. A statistics instructor believes that fewer than 20% of Evergreen Valley College (EVC) students attended the opening midnight showing of the latest Harry Potter movie. She surveys 84 of her students and finds that 11 of them attended the midnight showing. The Type I error is to conclude that the percent of EVC students who attended is ________.
a. at least 20%, when in fact, it is less than 20%.
b. 20%, when in fact, it is 20%.
c. less than 20%, when in fact, it is at least 20%.
d. less than 20%, when in fact, it is less than 20%.
e. None
18. Previously, an organization reported that teenagers spent 4.5 hours per week, on average, on the phone. The organization thinks that, currently, the mean is higher. Fifteen randomly chosen teenagers were asked how many hours per week they spend on the phone. The sample mean was 4.75 hours with a sample standard deviation of 2.0. Conduct a hypothesis test.
The null and alternative hypotheses are:
a.Ho: x =4.5,Ha : x >4.5
b.Ho :4.5,Ha :<4.5
c.Ho :=4.75,Ha :>4.75
d.Ho :=4.5Ha :>4.5
e. None
19. Suppose a statistics instructor believes that there is no significant difference between the mean class scores of statistics day students on Exam 2 and statistics night students on Exam 2. She takes random samples from each of the populations. The mean and standard deviation for 35 statistics day students were 75.86 and 16.91, respectively. The mean and standard deviation for 37 statistics night students were 75.41 and 19.73. The “day” subscript refers to the statistics day students. The “night” subscript refers to the statistics night students. An appropriate alternative hypothesis for the hypothesis test is:
a. day > night
b. day < night
c. day = night
d. day = night
e. None
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