Question 1

When the results of a t test are presented in a research article,the number(s)in parentheses that directly follow the t score is(are)the __________.

Accepted Answer

The answer of When the results of a t test...

Question 2

In terms of meeting assumptions of the t test for dependent means,the most common cause of serious problems is when a one-tailed test is used and the population distribution is highly __________.

Accepted Answer

The answer of In terms of meeting assumptions of the...

Question 3

An organizational psychologist is hired as a consultant to a company planning to open a coffee house for college students.The company wants to know if their customers will drink more coffee if the coffee house is decorated in a Paris motif or in a San Francisco motif,so the psychologist sets up two similar rooms with the two motifs.Eight students spend an afternoon in each room,drinking all the coffee they like.The order in which they sit in the rooms is rotated so that half spend their first afternoon in the Paris room and half in the San Francisco room.The amount of coffee each participant drinks in each room is shown below.Using the .05 significance level,is there a significant difference between the numbers of cups of coffee consumed in the two rooms?  a.Use the five steps of hypothesis testing.
b.Sketch the distributions involved.
c.Figure the effect size and find the approximate power of this study.
d.Explain the logic of what you did to a person who is familiar with hypothesis testing with a known population variance and a single sample,including understanding decision errors,effect size and power,but who knows nothing about t tests of any kind (for example,you do not need to describe the steps or logic of hypothesis testing).Be sure you explain how this problem differs from a problem with a known population variance and a single sample.Your answer should consist mainly of a thorough explanation of the characteristics of the comparison distribution and all the figuring you did to determine those characteristics.

Accepted Answer

The answer of An organizational psychologist is hired as a...

Question 4

The results of a study using a t test for dependent means involving 45 participants that yielded a t score of 2.89,which was significant at the .01 level,would be reported in a journal article in symbols and numbers as __________.

Accepted Answer

The answer of The results of a study using a...

Question 5

If the results of a study are reported in a research article as "t (29)= 2.31,p < .05," you can conclude that the result is __________.

Accepted Answer

The answer of If the results of a study are...

Question 6

In a study to test the effects of science fiction movies on people's belief in the supernatural,seven people completed a measure of belief in the supernatural before and after watching a popular science fiction movie.Participants' scores are listed below with high scores indicating higher levels of belief.Using the .01 significance level,carry out a t test for dependent means to test the experimenter's assumption that the participants' belief in the supernatural would change after watching the movie.  a.Use the five steps of hypothesis testing.
b.Sketch the distributions involved.
c.Figure the effect size and find the approximate power of this study.
d.Explain the logic of what you did to a person who is familiar with hypothesis testing with a known population variance and a single sample,including understanding decision errors,effect size and power,but who knows nothing about t tests of any kind (for example,you do not need to describe the steps or logic of hypothesis testing).Be sure you explain how this problem differs from a problem with a known population variance and a single sample.Your answer should consist mainly of a thorough explanation of the characteristics of the comparison distribution and all the figuring you did to determine those characteristics.

Accepted Answer

The answer of In a study to test the effects...

Question 7

t tests are often __________ to assumption violations.

Accepted Answer

The answer of t tests are often __________ to assumption...

Question 8

Knowing that a particular laboratory decision task takes the average person 2.5 seconds,an experimenter found that 30 randomly selected 80 year olds had a mean response time of 2.7 seconds with an estimated population standard deviation of 1.4 seconds.Using the .05 significance level,is the mean response time of older people slower than the response time of people in general?
a.Use the five steps of hypothesis testing.
b.Sketch the distributions involved.
c.Explain the logic of what you did to a person who is familiar with hypothesis testing with a known population variance and a single sample,but who knows nothing about t tests of any kind (for example,you do not need to describe the steps or logic of hypothesis testing).Be sure you explain how this problem differs from a problem with a known population variance and a single sample.Your answer should consist mainly of a thorough explanation of the characteristics of the comparison distribution and all the figuring you did to determine those characteristics.

Accepted Answer

The answer of Knowing that a particular laboratory decision task...

Question 9

A social psychologist gave a questionnaire about concern for farm workers to seven participants before and after they attended a film about union organization of farm workers.The results are shown below with high scores meaning high concern.Using the .05 significance level,do these results support the hypothesis that the film affected concern for the lives of farm workers?  a.Use the five steps of hypothesis testing.
b.Sketch the distributions involved.
c.Figure the effect size and find the approximate power of this study.
d.Explain the logic of what you did to a person who is familiar with hypothesis testing with a known population variance and a single sample,including understanding decision errors,effect size and power,but who knows nothing about t tests of any kind (for example,you do not need to describe the steps or logic of hypothesis testing).Be sure you explain how this problem differs from a problem with a known population variance and a single sample.Your answer should consist mainly of a thorough explanation of the characteristics of the comparison distribution and all the figuring you did to determine those characteristics.

Accepted Answer

The answer of A social psychologist gave a questionnaire about...

Question 10

A swimming school claimed that the average seven-year-old would be able to swim across an Olympic-sized pool in less than 2 minutes after taking lessons from their instructors.To test this claim,a consumer psychologist arranged for eight randomly selected seven-year-old children to take lessons at the school and recorded how long it took each child to swim across a pool at the end of the lessons.The times (in seconds)were 60,120,110,80,70,90,100,and 130.What conclusion would the psychologist draw following a t test for a single sample using 120 seconds as the "known" population mean and the .05 significance level?
a.Use the five steps of hypothesis testing.
b.Sketch the distributions involved.
c.Explain the logic of what you did to a person who is familiar with hypothesis testing with a known population variance and a single sample,but who knows nothing about t tests of any kind (for example,you do not need to describe the steps or logic of hypothesis testing).Be sure you explain how this problem differs from a problem with a known population variance and a single sample.Your answer should consist mainly of a thorough explanation of the characteristics of the comparison distribution and all the figuring you did to determine those characteristics.

Accepted Answer

The answer of A swimming school claimed that the average...

Question 11

An organizational psychologist wants to know if workers' health would improve if a company gave workers extra days off.All workers take a standard physical exam twice a year and are given an overall health rating with higher scores indicating better health.The psychologist selected five workers at random,arranged to have them receive an additional 2 days off every month over the period between health exams,and then compared the health scores on the two exams.Using the .05 significance level,do the scores in the table below support the notion that having extra days off improves health?  a.Use the five steps of hypothesis testing.
b.Sketch the distributions involved.
c.Figure the effect size and find the approximate power of this study.
d.Explain the logic of what you did to a person who is familiar with hypothesis testing with a known population variance and a single sample,including understanding decision errors,effect size and power,but who knows nothing about t tests of any kind (for example,you do not need to describe the steps or logic of hypothesis testing).Be sure you explain how this problem differs from a problem with a known population variance and a single sample.Your answer should consist mainly of a thorough explanation of the characteristics of the comparison distribution and all the figuring you did to determine those characteristics.

Accepted Answer

The answer of An organizational psychologist wants to know if...

Question 12

An industrial psychologist consulting with a chain of music stores knows that the average number of complaints management receives each month throughout the industry is 4,but the variance is unknown.Nine of the chain's stores were randomly selected to record complaints for one month; they received 2,4,3,5,0,2,5,1,and 5 complaints.Using the .05 significance level,is the number of complaints received by the chain different from the number of complaints received by music stores in general?
a.Use the five steps of hypothesis testing.
b.Sketch the distributions involved.
c.Explain the logic of what you did to a person who is familiar with hypothesis testing with a known population variance and a single sample,but who knows nothing about t tests of any kind (for example,you do not need to describe the steps or logic of hypothesis testing).Be sure you explain how this problem differs from a problem with a known population variance and a single sample.Your answer should consist mainly of a thorough explanation of the characteristics of the comparison distribution and all the figuring you did to determine those characteristics.

Accepted Answer

The answer of An industrial psychologist consulting with a chain...

Quiz 7: Introduction to T Tests: Single Sample and Dependent Means

When the results of a t test are presented in a research article,the number(s)in parentheses that directly follow the t score is(are)the __________.

In terms of meeting assumptions of the t test for dependent means,the most common cause of serious problems is when a one-tailed test is used and the population distribution is highly __________.

The results of a study using a t test for dependent means involving 45 participants that yielded a t score of 2.89,which was significant at the .01 level,would be reported in a journal article in symbols and numbers as __________.

If the results of a study are reported in a research article as "t (29)= 2.31,p < .05," you can conclude that the result is __________.

t tests are often __________ to assumption violations.