Determine if the examples below describe a two-sample z test for proportions, tw
ID: 3249945 • Letter: D
Question
Determine if the examples below describe a two-sample z test for proportions, two-sample t test for means, or a paired t test
Paired t test.
Two-sample t test for means.
A two-sample z test for proportions
1.Thirty dogs were selected at random from those residing at the humane society last month. The 30 dogs were split at random into two groups. The first group of 15 dogs was trained to perform a certain task using a reward method. The second group of 15 dogs was trained to perform the same task using a reward-punishment method. The investigator of this study will have two sets of data: the learning times for the dogs trained with the reward method and the learning times for the dogs trained with the reward-punishment methodThirty dogs were selected at random from those residing at the humane society last month. The 30 dogs were split at random into two groups. The first group of 15 dogs was trained to perform a certain task using a reward method. The second group of 15 dogs was trained to perform the same task using a reward-punishment method. The investigator of this study will have two sets of data: the learning times for the dogs trained with the reward method and the learning times for the dogs trained with the reward-punishment method.
2.Three hundred registered voters were selected at random, 30 from each of 10 midwestern counties, to participate in a study on attitudes about how well the president is performing his job. They were each asked to answer a short multiple-choice questionnaire and then they watched a 20-minute video that presented information about the job description of the president. After watching the video, the same 300 selected voters were asked to answer a follow-up multiple-choice questionnaire. The investigator of this study will have two sets of data: the initial questionnaire scores and the follow-up questionnaire scores.
3.Twenty vegetarians were selected at random and asked if they were atheists. Twenty non-vegetarians were selected at random and asked if they were atheists. The investigator of this study will have two sets of data: a yes/no response from the vegetarians and a yes/no response from the non-vegetarians.
For the following research questios, briefly describe how you might design a study to address the question (discuss whether paired or independent samples would be obtained):
Do freshmen students use the library to study more often than senior students?
A.Paired t test.
B.Two-sample t test for means.
C.A two-sample z test for proportions
Explanation / Answer
Answer:
Determine if the examples below describe a two-sample z test for proportions, two-sample t test for means, or a paired t test
A.
Paired t test.
B.
Two-sample t test for means.
C.
A two-sample z test for proportions
1.Thirty dogs were selected at random from those residing at the humane society last month. The 30 dogs were split at random into two groups. The first group of 15 dogs was trained to perform a certain task using a reward method. The second group of 15 dogs was trained to perform the same task using a reward-punishment method. The investigator of this study will have two sets of data: the learning times for the dogs trained with the reward method and the learning times for the dogs trained with the reward-punishment method
B.
Two-sample t test for means.
2.Three hundred registered voters were selected at random, 30 from each of 10 midwestern counties, to participate in a study on attitudes about how well the president is performing his job. They were each asked to answer a short multiple-choice questionnaire and then they watched a 20-minute video that presented information about the job description of the president. After watching the video, the same 300 selected voters were asked to answer a follow-up multiple-choice questionnaire. The investigator of this study will have two sets of data: the initial questionnaire scores and the follow-up questionnaire scores.
A.
Paired t test.
3.Twenty vegetarians were selected at random and asked if they were atheists. Twenty non-vegetarians were selected at random and asked if they were atheists. The investigator of this study will have two sets of data: a yes/no response from the vegetarians and a yes/no response from the non-vegetarians.
C.
A two-sample z test for proportions
For the following research questions, briefly describe how you might design a study to address the question (discuss whether paired or independent samples would be obtained):
Do freshmen students use the library to study more often than senior students?
Independent samples of freshmen students and senior students obtained. This is a two group design.
A.
Paired t test.
B.
Two-sample t test for means.
C.
A two-sample z test for proportions
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