SOLUTION: Question 1
You conduct a one-sample t test and find that t = -1.83. Your study has 81 participants. Your research hypothesis is directional. sketch a normal curve and
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Question 962101: Question 1
You conduct a one-sample t test and find that t = -1.83. Your study has 81 participants. Your research hypothesis is directional. sketch a normal curve and draw vertical lines for and label from -3σM to +3σM, locate and label the tabled critical t, and locate and label the computed t. Can you reject the null hypothesis at α = .01?
Yes
No
-no response
-no response
.
4 points
Question 2
You conduct a one-sample t test and find that t = -1.83. Your study has 81 participants. Your research hypothesis is directional. sketch a normal curve and draw vertical lines for and label from -3σM to +3σM, locate and label the tabled critical t, and locate and label the computed t. Can you reject the null hypothesis at α = .05?
Yes
No
Maybe
More information is needed
.
4 points
Question 3
A researcher conducts a one-tailed one-sample t test on 25 subjects and finds that t = 1.89. How many degrees of freedom are in this study?
26
25
24
23
.
4 points
Question 4
A researcher conducts a one-tailed one-sample t test on 25 subjects and finds that t = 1.89. About what is the actual Type 1 error for the study?
Around 3%
Around 4%
Around 5%
Around 6%
.
4 points
Question 5
A researcher conducts a one-tailed one-sample t test on 25 subjects and finds that t = 1.89. How confident can the researcher be that the results are true and not due to mere sampling error?
Around 98%
Around 97%
Around 96%
Around 95%
.
4 points
Question 6
A researcher conducts a one-tailed one-sample t test on 25 subjects and finds that t = 1.89. Report the results as they would appear in an academic journal entry.
t(25) = 1.89, p = 6.6
t(25) = 1.89, p = 4.8
t(25) = 1.89, p = 5.5
t(25) = 1.89, p = 3.9
.
4 points
Question 7
A researcher conducts a two-tailed one-sample t test on 24 subjects and find that t = 1.89. How many degrees of freedom are in this study?
22
23
24
25
.
4 points
Question 8
A researcher conducts a two-tailed one-sample t test on 24 subjects and find that t = 1.89. About what is the actual Type 1 error for the study?
8%
15%
26%
.01%
.
4 points
Question 9
A researcher conducts a two-tailed one-sample t test on 24 subjects and find that t = 1.89. How confident can the researcher be that the results are true and not due to mere sampling error?
.05%
85%
92%
100%
.
4 points
Question 10
A researcher conducts a two-tailed one-sample t test on 24 subjects and find that t = 1.89. Report the results as they would appear in an academic journal.
t(23) =1.89, p=.08
t(23) =1.89, p=.99
t(23) =1.89, p=.25
t(23) =1.89, p=.11
.
4 points
Question 11
Calculate σM1 - M2 for a study of self-esteem between the sexes, in which the value of σM for women is 1.32 and that for men is 1.94.
1.02
3.76
2.35
7.63
.
4 points
Question 12
In a study of the effect of a new drug on the alleviation of asthma symptoms, the σM for symptom relief in the patient group that received the new drug is 1.45, and the σM for symptom relief in the group that did not receive the new drug is 1.22. Calculate σ M1-M2
1.89
1.77
1.93
1.79
.
4 points
Question 13
Elena Martin is campaigning for the city council. . She has two types of lawn signs to distribute: large ones and small ones. She wonders if the size of the sign affects residents’ willingness to display the signs on their property. Early in the campaign, her staff obtain a list of homeowners in each of the city’s 10 voting districts who are registered in her political party and presumably not averse to advertising their support for her. The staff randomly selects homeowners in each of the 10 districts, to some of whom they send large signs and to others, small signs. Two weeks later, staff members drive by each home to which they sent the signs to record whether or not the sign is being displayed. Here are the percentages of homes displaying the signs in each district:
_______________________________
Large Sign
Small Sign
34
41
41
44
30
36
32
38
28
29
31
47
40
49
27
39
36
43
22
37
____________________________
Is the research hypothesis in this study directional or nondirectional?
directional
nondirectional
Not enough information
Both
.
4 points
Question 14
Elena Martin is campaigning for the city council. . She has two types of lawn signs to distribute: large ones and small ones. She wonders if the size of the sign affects residents’ willingness to display the signs on their property. Early in the campaign, her staff obtain a list of homeowners in each of the city’s 10 voting districts who are registered in her political party and presumably not averse to advertising their support for her. The staff randomly selects homeowners in each of the 10 districts, to some of whom they send large signs and to others, small signs. Two weeks later, staff members drive by each home to which they sent the signs to record whether or not the sign is being displayed. Here are the percentages of homes displaying the signs in each district:
__________________________________
Large Signs
Small Signs
6
7
7
10
5
8
7
5
8
9
6
10
10
7
9
6
6
5
7
6
5
8
7
6
__________________________________
State the research hypothesis.
Not enough information
Voting district will differ by the preference of sign size
The effectiveness of the city counsel will effect the community's preference of sign size
Homeowner’s willingness to display the campaign signs will differ by the size of the sign
.
4 points
Question 15
Elena Martin is campaigning for the city council. She has two types of lawn signs to distribute: large ones and small ones. She wonders if the size of the sign affects residents’ willingness to display the signs on their property. Early in the campaign, her staff obtain a list of homeowners in each of the city’ s 10 voting districts who are registered in her political party and presumably not averse to advertising their support for her. The staff randomly selects homeowners in each of the 10 districts, to some of whom they send large signs and to others, small signs. Two weeks later, staff members drive by each home to which they sent the signs to record whether or not the sign is being displayed.
Refer to question 4 on page 242 for the table.
Calculate t and compare it with the tabled critical t at the .01 α level. Can you reject the null hypothesis?
Yes
No
Not enough information
Both
.
4 points
Question 16
An Internet provider wonders if its cable Internet customers are significantly more satisfied with one or the other of its two packages -- free e-mail or free basic TV. The company surveys 12 customers currently receiving free e-mail with their cable Internet and 12 customers currently receiving free basic TV with their cable Internet. Satisfaction scores range from 1 to 10 based on answers to the survey questions. Here are the scores. Conduct a two-tailed t test at the .05 α level. Are the customers significantly more satisfied with one package or the other?
Reject the null hypothesis
Do not reject the null hypothesis
Not enough information
Both
.
4 points
Question 17
An Internet provider wonders if its cable Internet customers are significantly more satisfied with one or the other of its two packages -- free e-mail or free basic TV. *The company surveys 12 customers currently receiving free e-mail with their cable Internet and 12 customers currently receiving free basic TV with their cable Internet. Satisfaction scores range from 1 to 10 based on answers to the survey questions. Conduct a two-tailed t test at the .05 α level. Are the customers significantly more satisfied with one package or the other?
Reject the null hypothesis
Do not reject the null hypothesis
Not enough information
Both
.
4 points
Question 18
A research conducts a one-tailed two-sample t test on 32 subjects (16 subjects in each group) and finds that t = 2.182. How many degrees of freedom are there in this study?
32
31
30
29
.
4 points
Question 19
A research conducts a one-tailed two-sample t test on 32 subjects (16 subjects in each group) and finds that t = 2.182. About what is the actual Type 1 error for the study?
between 2.5 and 3
between 0 and .05
between 3 and 3.5
between 1 and 2.5
.
4 points
Question 20
A research conducts a one-tailed two-sample t test on 32 subjects (16 subjects in each group) and finds that t = 2.182. How confident can the researcher be that the results are true and not due to mere sampling error?
Around 98%
Around 86%
Around 84%
Around 62%
.
4 points
Question 21
A research conducts a one-tailed two-sample t test on 32 subjects (16 subjects in each group) and finds that t = 2.182. Report the results as they would appear in an academic journal.
t(30) = .05, p = .83
t(30) = .05, p = .02
t(30) = 2.182, p = .02
t(30) = 2.182, p = .83
.
4 points
Question 22
A researcher conducts a one-tailed independent samples t test on 20 subjects (10 subjects in each group) and finds that t = 2.32665. How many degrees of freedom are in this study?
18
19
20
21
.
4 points
Question 23
A researcher conducts a one-tailed independent samples t test on 20 subjects (10 subjects in each group) and finds that t = 2.32665.About what is the actual Type 1 error in the study?
Between 0 and .075
Between 1 and 2.5
Between 2.5 and 3.5
Between 3.5 and 4.5
.
4 points
Question 24
A researcher conducts a one-tailed independent samples t test on 20 subjects (10 subjects in each group) and finds that t = 2.32665.How confident can the research be that the results are true and not due to mere sampling error?
50
79
100
.
4 points
Question 25
A researcher conducts a one-tailed independent samples t test on 20 subjects (10 subjects in each group) and finds that t = 2.32665. Report the results as they would appear in an academic journal.
t(18) = 7.32568, p = .50
t(18) = 7.32568, p = .02
t(18) = 2.32665, p = .50
t(18) = 2.32665, p = .02
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