Math problems 10 questions

plesse just put the put the correct letter next to the number.

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QUESTION 1

A researcher conducts a one-way ANOVA test on three groups. The level of significance is set to alpha = .05. The test reveals a p-level of .38. Which of the following is the correct result of the test?

The null hypothesis is rejected. Post hoc tests consisting of pairwise comparisons must be conducted.

The null hypothesis is rejected. Post hoc tests do not need to be conducted.

The researcher fails to reject the null hypothesis. Post hoc tests do not need to be conducted.

The test results are inconclusive. The researcher will need to repeat the test.

2 points

QUESTION 2

What is the purpose of the post hoc tests that are conducted after an ANOVA test?

Pairwise comparisons are made to discover where the differences lie in the various groups.

Correlation tests are run between groups to examine the strength of the relationships.

Linear regression is analyzed to discover formulas for predicting values in each of the groups.

Descriptive statistic are organized in order to summarize the data collected in the groups.

2 points

QUESTION 3

What is the name of the tests that are performed after an ANOVA test if the null hypothesis is rejected?

Linear regression

Correlation

Post hoc tests

Descriptive statistics

2 points

QUESTION 4

A one-way ANOVA test is conducted on three groups, Group A, Group B, and Group C. The level of significance is set to alpha = .05. The results show a p-level of .01. The researcher rejects the null hypothesis and needs to conduct post hoc tests. How many pairwise comparisons will need to be made?

The researcher will need to make two comparisons:

1) Group A and Group B

2) Group B and Group C

The researcher will need to make two comparisons:

1) Group A & Group B

2) Group A & Group C

The researcher will need to make three comparisons:

1) Group A & Group B

2) Group A & Group C and

3) Group B & Group C

The researcher does not have to conduct post hoc tests, because the null hypothesis is rejected.

2 points

QUESTION 5

Which of the following would describe a new treatment that has substantive or practical significance?

A new treatment has a statistically significant impact in curing a disease. Additionally, ANOVA testing has shown that the new treatment is less effective than existing treatments.

A new treatment has a statistically significant impact in curing a disease. Additionally, ANOVA testing has shown that the new treatment is more effective than existing treatments.

A new treatment claims to be effective in curing a disease. No testing has been performed to determine the effectiveness of the treatment, but there are several testimonials describing its impact.

A new treatment claims to be effective in curing a disease. No testing has been performed on the effectiveness of the treatment.

2 points

QUESTION 6

A researcher conducts a one-way ANOVA test on three groups. The level of significance is set to alpha = .05. The test reveals a p-level of .02. Which of the following is the correct result of the test?

The null hypothesis is rejected. Post hoc tests consisting of pairwise comparisons must be conducted.

The researcher fails to reject the null hypothesis. Post hoc tests do not need to be conducted.

The researcher fails to reject the null hypothesis. Post hoc tests need to be conducted.

The test results are inconclusive. The researcher will need to repeat the test.

2 points

QUESTION 7

A researcher conducts a one-way ANOVA test on four groups. The level of significance is set to alpha = .05. Which of the following is the null hypothesis for the test?

There is a difference among the means of the groups; the means of the four groups are not equal.

One of the means of the groups is significantly greater than the means of the other three groups.

One of the means of the groups is significantly less than the means of the other three groups.

There is no difference among the means of the four groups; the means of the four groups are equal.

2 points

QUESTION 8

Match the following terms to their definitions.

Statistical significance

Substantive or practical significance

ANOVA Testing

A technique for comparing the means and variances of two or more populations.

A difference deemed to be important within the context of the research area.

A difference that cannot be explained by chance.

2 points

QUESTION 9

When are post hoc tests needed?

When the null hypothesis is accepted, post hoc tests must be performed.

When the researcher is dissatisfied with the results, post hoc tests must be performed.

When the p-level is equal to the alpha level, the results are inconclusive and post hoc tests must be performed.

When the null hypothesis is rejected, post hoc tests must be performed.

2 points

QUESTION 10

A researcher conducts a one-way ANOVA test on four groups. The level of significance is set to alpha = .05. Which of the following is the alternate hypothesis for the test?

There is a difference among the means of the groups; the means of the four groups are not equal.

One of the means of the groups is significantly greater than the means of the other three groups.

One of the means of the groups is significantly less than the means of the other three groups.

There is no difference among the means of the four groups; the means of the four groups are equal

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