1. Which of the following demonstrates a Type I Error? A. A researcher obtains a significant...
1. Which of the following demonstrates a Type I Error?
| A. |
A researcher obtains a significant result and rejects the null hypothesis when the result is actually due to random chance and sampling error. |
|
| B. |
A researcher obtains a significant result and fails to reject the null hypothesis when the result is actually due to random chance and sampling error. |
|
| C. |
A researcher obtains a nonsignificant result and rejects the null hypothesis when the result is actually due to a genuine effect of the variables. |
|
| D. |
A researcher obtains a nonsignificant result and fails to reject the null hypothesis when the result is actually due to a genuine effect of the variables. |
2. Which of the following demonstrates a Type II Error?
| A. |
A researcher obtains a significant result and rejects the null hypothesis when the result is actually due to random chance and sampling error. |
|
| B. |
A researcher obtains a significant result and fails to reject the null hypothesis when the result is actually due to random chance and sampling error. |
|
| C. |
A researcher obtains a nonsignificant result and rejects the null hypothesis when the result is actually due to a genuine effect of the variables. |
|
| D. |
A researcher obtains a nonsignificant result and fails to reject the null hypothesis when the result is actually due to a genuine effect of the variables. |
3. Which scenario would produce the highest t-obt. values for an independent samples t-test?
| A. |
Large mean differences between the samples, with high variability within each sample |
|
| B. |
Small mean differences between the samples, with high variability within each sample |
|
| C. |
Large mean differences between the samples, with low variability within each sample |
|
| D. |
Small mean differences between the samples, with low variability within each sample |
Homework Answers
1. Type I error:
A researcher obtains a significant result and rejects the null hypothesis when the result is actually due to random chance and sampling error. Option A is correct.
2. Type II error:
A researcher obtains a nonsignificant result and fails to reject the null hypothesis when the result is actually due to a genuine effect of the variables. Option D is correct.
3. Large mean differences between the samples, with low variability within each sample
Option C is correct.
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