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13. A researcher is interested...

13. A researcher is interested in whether herbal remedies are effective in relieving allergies, and

if so, which ones are most effective. The researcher takes a group of 20 allergy sufferers

and randomly assigns each one to receive herbal tea, a homeopathic administration of

allergens, a traditional antihistamine, or a placebo pill. The dependent measure is the

number of allergy complaints by patients during weeks 2-3 of the treatments. The research

analyzed the data using an ANOVA, which resulted in the following table:

Analysis of Variance for Herbal Remedies

DF SS MS F P

Group 3 43.75 14.583 6.01 0.000

Error 16 38.80 2.425

Total 19 82.55

Using the above table, we can conclude that:

a. the data provide strong evidence that allergy complaints are related to herbal remedies.

b. the data provide strong evidence that allergy complaints are related to herbal remedies

in the following way: The mean number of allergy complaints for people who take

placebo pills is higher than The mean number of allergy complaints for people who take

herbal tea, which in turn is higher than the mean number of allergy complaints for people

who take homeopathics or traditional antihistamines.

c. the data provide strong evidence that the four mean allergy complaint scores

(representing the four allergy remedies) are all equal.

d. the data do not provide sufficient evidence that allergy complaints are related to herbal

remedies.

14. A fictional study was used to examine the effect of a new antianxiety drug on levels of

anxiety. Sixty participants were randomly assigned to one of two groups: 1) new

antianxiety pill and 2) placebo pill. One hour after taking the medication or placebo, all of

the participants were asked to complete the Beck Anxiety Inventory. What would be the

appropriate hypothesis testing technique to analyze the data from this study?

a. t-test for two independent samples

b. t-test for matched pairs

c. z-test for population mean

d. correlation

A psychologist is interested in whether the color of the walls of the rooms in Pediatric Units

has an effect on length of hospital stay, as measured in days in the hospital, after a routine

tonsillectomy. Ninety patients were randomly assigned to one of three room color conditions

(Pale Yellow, Pale Pink, or Pale Blue) and the number of days hospitalized for each patient

was recorded. What hypothesis testing technique should the psychologist use to analyze

the data from this study?

a. t-test for two independent samples

b. z-test for population mean

c. Chi square test for independence

d. ANOVA

16. A developmental researcher is interested in whether infants’ attention to their mothers’

voices increases in the first week of life. The researcher selects 15 full-term normal, healthy

infants and tested the number of seconds that they oriented in the direction of their mother’s

voice on Day 1 and on Day 7 after delivery. What hypothesis testing technique should the

developmental psychologist use to analyze the data from this study?

a. t-test for two independent samples

b. t-test for matched pairs

c. Chi square test for independence

d. correlation

17. A newspaper article reported that the typical American family spent an average of $75 for

Easter candy last year. A sample of N=16 families this year reported spending a mean of

$85, with a standard deviation of $20. What hypothesis testing technique should be used to

determine whether there has been a significant change in holiday spending?

a. t-test for two independent samples

b. t-test for matched pairs

c. z-test for population mean

d. t-test for population mean

18. A school psychologist is interested in comparing the math test scores of 3rd grade students

in his school to the national average. The national average score is 100 with a standard

deviation of 15. What hypothesis testing technique should the school psychologist use to

analyze the data from this study?

a. t-test for two independent samples

b. t-test for matched pairs

c. z-test for population mean

d. t-test for population mean

19. It has been suggested that the rate of forgetting (coded as normal vs. fast) for word lists

often used in psychological experiments may depend on the type of memory test

employed, either free-recall or recognition. What is the best way to test this hypothesis?

a. regression

b. z-test for population mean

c. ANOVA

d. Chi square test for independence

20. A professor is interested in the relationship between the number of hours students study for

a quiz and their quiz grades. She asked each student to record the number of hours that

he/she studied for the final exam. She also recorded the students’ grades in percentages

(ex. 86%). What technique should the professor use to analyze the data?

a. t-test for two independent samples

b. t-test for matched pairs

c. Chi square test for independence

d. correlation

if so, which ones are most effective. The researcher takes a group of 20 allergy sufferers

and randomly assigns each one to receive herbal tea, a homeopathic administration of

allergens, a traditional antihistamine, or a placebo pill. The dependent measure is the

number of allergy complaints by patients during weeks 2-3 of the treatments. The research

analyzed the data using an ANOVA, which resulted in the following table:

Analysis of Variance for Herbal Remedies

DF SS MS F P

Group 3 43.75 14.583 6.01 0.000

Error 16 38.80 2.425

Total 19 82.55

Using the above table, we can conclude that:

a. the data provide strong evidence that allergy complaints are related to herbal remedies.

b. the data provide strong evidence that allergy complaints are related to herbal remedies

in the following way: The mean number of allergy complaints for people who take

placebo pills is higher than The mean number of allergy complaints for people who take

herbal tea, which in turn is higher than the mean number of allergy complaints for people

who take homeopathics or traditional antihistamines.

c. the data provide strong evidence that the four mean allergy complaint scores

(representing the four allergy remedies) are all equal.

d. the data do not provide sufficient evidence that allergy complaints are related to herbal

remedies.

14. A fictional study was used to examine the effect of a new antianxiety drug on levels of

anxiety. Sixty participants were randomly assigned to one of two groups: 1) new

antianxiety pill and 2) placebo pill. One hour after taking the medication or placebo, all of

the participants were asked to complete the Beck Anxiety Inventory. What would be the

appropriate hypothesis testing technique to analyze the data from this study?

a. t-test for two independent samples

b. t-test for matched pairs

c. z-test for population mean

d. correlation

A psychologist is interested in whether the color of the walls of the rooms in Pediatric Units

has an effect on length of hospital stay, as measured in days in the hospital, after a routine

tonsillectomy. Ninety patients were randomly assigned to one of three room color conditions

(Pale Yellow, Pale Pink, or Pale Blue) and the number of days hospitalized for each patient

was recorded. What hypothesis testing technique should the psychologist use to analyze

the data from this study?

a. t-test for two independent samples

b. z-test for population mean

c. Chi square test for independence

d. ANOVA

16. A developmental researcher is interested in whether infants’ attention to their mothers’

voices increases in the first week of life. The researcher selects 15 full-term normal, healthy

infants and tested the number of seconds that they oriented in the direction of their mother’s

voice on Day 1 and on Day 7 after delivery. What hypothesis testing technique should the

developmental psychologist use to analyze the data from this study?

a. t-test for two independent samples

b. t-test for matched pairs

c. Chi square test for independence

d. correlation

17. A newspaper article reported that the typical American family spent an average of $75 for

Easter candy last year. A sample of N=16 families this year reported spending a mean of

$85, with a standard deviation of $20. What hypothesis testing technique should be used to

determine whether there has been a significant change in holiday spending?

a. t-test for two independent samples

b. t-test for matched pairs

c. z-test for population mean

d. t-test for population mean

18. A school psychologist is interested in comparing the math test scores of 3rd grade students

in his school to the national average. The national average score is 100 with a standard

deviation of 15. What hypothesis testing technique should the school psychologist use to

analyze the data from this study?

a. t-test for two independent samples

b. t-test for matched pairs

c. z-test for population mean

d. t-test for population mean

19. It has been suggested that the rate of forgetting (coded as normal vs. fast) for word lists

often used in psychological experiments may depend on the type of memory test

employed, either free-recall or recognition. What is the best way to test this hypothesis?

a. regression

b. z-test for population mean

c. ANOVA

d. Chi square test for independence

20. A professor is interested in the relationship between the number of hours students study for

a quiz and their quiz grades. She asked each student to record the number of hours that

he/she studied for the final exam. She also recorded the students’ grades in percentages

(ex. 86%). What technique should the professor use to analyze the data?

a. t-test for two independent samples

b. t-test for matched pairs

c. Chi square test for independence

d. correlation

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