HCD 300 - Homework 10

While doing research, Faith found that the p-value was 0.01. If she set her alpha as 0.5, should she reject the null hypothesis? Why?

- 0.010 < 0.5, reject the null hypothesis

While doing research, Faith performed a one-way ANOVA and found that the p-value was 0.023. If she set her alpha as 0.5, should she reject the null hypothesis? Why?

- 0.023<0.5, the finding for interaction is significant

While doing research, Faith performed a one-way ANOVA and found that the p-value was 0.049. If she set her alpha as 0.5, should she reject the null hypothesis? Why?

- 0.049 < 0.5, reject the null hypothesis

Researchers want to determine whether or not there is a difference in systolic blood pressure based on how many hours a person exercises per week. They divide a sample of 72 people into 3 groups based on how many hours they exercise per week. Group 1 exercises less than 2 hours per week, Group 2 exercises between 2 and 5 hours per week, and Group 3 exercises more than 5 hours per week. Researchers measure and record the systolic blood pressure for each participant. They choose α = 0.05 level to test their results. What is the between groups degrees of freedom for this study?

- 2

F(2, 33) = 5.5, p < 0.01 How many groups were in this study?

- 3

A group of 20 people were asked to remember as many items as possible from a list before and after being taught a memory device. Researchers want to see if there is a significant difference in the amount of items that people are able to remember before and after being taught the memory device. They also want to determine whether or not men and women perform differently on the memory test. They choose α = 0.05 level to test their results. What is the within groups degrees of freedom for this study?

- 36

F(2, 33) = 5.5, p < 0.01 How many participants were in this study?

- 36

Jessica is comparing the means of four groups and calculates a f ratio value of 4.5 if the critical value for interaction is 5, is the finding statistically significant?

- 4.5 < 5, the finding for interaction is not significant

For F(5, 35) = 6.5, p < 0.01, how many participants were in the study?

- 41

F(2, 33) = 5.5, p < 0.01 What is the F ratio?

- 5.5

For F(5, 35) = 6.5, p < 0.01, how many groups were in the study?

- 6

For F(5, 35) = 6.5, p < 0.01, what is the F ratio? If the critical value is 4.3, is there significance?

- 6.5 and the F ratio is significant

Which of the following assumptions does ANOVA have?

- Equal Variance

A group of 20 people were asked to remember as many items as possible from a list before and after being taught a memory device. Researchers want to see if there is a significant difference in the amount of items that people are able to remember before and after being taught the memory device. They also want to determine whether or not men and women perform differently on the memory test. They choose α = 0.05 level to test their results. True or False, performance on the memory test before and after being taught the memory device varies based on gender.

- False

A group of 20 people were asked to remember as many items as possible from a list before and after being taught a memory device. Researchers want to see if there is a significant difference in the amount of items that people are able to remember before and after being taught the memory device. They also want to determine whether or not men and women perform differently on the memory test. They choose α = 0.05 level to test their results. True or False, the relationship between gender and performance on the memory test is statistically significant.

- False

Alex is comparing the means for four groups and calculates a f-ratio value of -5.5 if the critical value for interaction is 1.5, is the finding statistically significant?

- He has made an error in his calculation.

In two-way ANOVA, what is the difference between interaction and main effect?

- Interaction is the the effect of one variable depends on the level of the other and main effect is effect of each of the independent variables

A set of researchers are trying to determine the best possible dose to treat Mycobacterium tuberculosis. Researchers have found a new drug that disrupts the waxy, Mycolic acid that makes us one of layers of the bacteria. To find the best dose, they perform a minimum bactericidal concentration (MBC) test. In the first group, 8 microgram/milliliter. In the second group, 16 microgram/milliliter. In the third group, 25 microgram/milliliter. What is the appropriate test to use?

- One-way ANOVA

If I used simple ANOVA, what type of ANOVA did I use?

- One-way ANOVA

Researchers want to determine if caffeine affects reaction time. They divide a sample of 150 people into 3 groups. Group 1 gets a regular drink with no caffeine, group 2 gets a drink with 95 mg of caffeine, and group 3 gets a drink with 250 mg of caffeine. Each group is then given a test to gauge their reaction time. What is the appropriate test to use?

- One-way ANOVA

Simple ANOVA is also known as?

- One-way ANOVA

Which of the following assumptions does ANOVA have?

- Quantitative data

Which of the following assumptions does ANOVA have?

- Samples are Independent

Which provides the correct steps in order to test a two-way ANOVA?

- State the null hypothesis, State the alternative hypothesis, Run a two-way ANOVA test, Interpret results

How does the primary purpose of one-way ANOVA differ from that of two-way ANOVA?

- The primary purpose of one-way ANOVA is to see if there is a group difference while two-way ANOVA has the added purpose of looking for interaction between the groups

Researchers want to determine whether or not there is a difference in systolic blood pressure based on how many hours a person exercises per week. They divide a sample of 72 people into 3 groups based on how many hours they exercise per week. Group 1 exercises less than 2 hours per week, Group 2 exercises between 2 and 5 hours per week, and Group 3 exercises more than 5 hours per week. Researchers measure and record the systolic blood pressure for each participant. They choose α = 0.05 level to test their results. True or False, this finding is statistically significant.

- True

Researchers want to see the effect grade level and gender have on SAT scores. Which test should you use?

- Two-way ANOVA

Looking at the table below, is this an example of one-way ANOVA or two-way Anova and WHY? (male v female. 3 groups, 5hrs, 10hrs, 20hrs per week)

- Two-way ANOVA because it looks at how both gender and the number of hours of participation affect language development scores.

If I used repeated measures, what type of ANOVA did I use?

- Two-way ANOVA with Replication

Which of the following outcomes is(are) possible in two-way ANOVA

- all are correct (significant main effect and significant interaction. no significant main effect; significant interaction. significant main effect, no significant interaction)

Which of the following assumptions does ANOVA have?

- equal variance

A group of 20 people were asked to remember as many items as possible from a list before and after being taught a memory device. Researchers want to see if there is a significant difference in the amount of items that people are able to remember before and after being taught the memory device. They also want to determine whether or not men and women perform differently on the memory test. They choose α = 0.05 level to test their results. Based on this information, the researcher should make the decision to ___________ the null hypothesis that there is no effect of gender on performance on the memory test.

- fail to reject

A group of 20 people were asked to remember as many items as possible from a list before and after being taught a memory device. Researchers want to see if there is a significant difference in the amount of items that people are able to remember before and after being taught the memory device. They also want to determine whether or not men and women perform differently on the memory test. They choose α = 0.05 level to test their results. What are the independent variable(s)?

- gender - use of memory device

Arnold compares the means of three groups and calculates a value of -2.01 for the F ratio. This F ratio implies that _______.

- he has made an error in his calculations

Trish conducts an analysis which shows that the level of alcohol consumption affects reaction times more when a person is sleep-deprived than when a person is well-rested. This is an example of ______.

- interaction

Researchers want to determine whether or not there is a difference in systolic blood pressure based on how many hours a person exercises per week. They divide a sample of 72 people into 3 groups based on how many hours they exercise per week. Group 1 exercises less than 2 hours per week, Group 2 exercises between 2 and 5 hours per week, and Group 3 exercises more than 5 hours per week. Researchers measure and record the systolic blood pressure for each participant. They choose α = 0.05 level to test their results. How do you interpret this finding? There ____ enough evidence to conclude that there is a difference between the blood pressure measurements for the 3 groups at the 0.05 significance level.

- is

A group of 20 people were asked to remember as many items as possible from a list before and after being taught a memory device. Researchers want to see if there is a significant difference in the amount of items that people are able to remember before and after being taught the memory device. They also want to determine whether or not men and women perform differently on the memory test. They choose α = 0.05 level to test their results. How do you interpret this finding? There ____ enough evidence to conclude that there is a difference between the performance of men and women on the memory test at the 0.05 significance level.

- is not

Which of the following assumptions does ANOVA have?

- normal distribution of data

Researchers want to determine whether or not there is a difference in systolic blood pressure based on how many hours a person exercises per week. They divide a sample of 72 people into 3 groups based on how many hours they exercise per week. Group 1 exercises less than 2 hours per week, Group 2 exercises between 2 and 5 hours per week, and Group 3 exercises more than 5 hours per week. Researchers measure and record the systolic blood pressure for each participant. They choose α = 0.05 level to test their results. Based on the determination of significance, the researcher should make the decision to ___________.

- reject the null hypothesis

ANOVA with replication is also known as?

- repeated measures

Researchers want to determine the effects of gender and socioeconomic status (i.e. high, medium, and low) on student achievement. What is the appropriate test to use?

- two-way ANOVA