Statistics In Psychology 1

Table of Contents

Statistics In Psychology

1. A method for testing a claim or hypothesis about a parameter in a population, using data measured in a sample, is called

Save Time On Research and Writing
Hire a Pro to Write You a 100% Plagiarism-Free Paper.
Get My Paper

random sampling

level of significance   

hypothesis testing


Save Time On Research and Writing
Hire a Pro to Write You a 100% Plagiarism-Free Paper.
Get My Paper

2. The one-sample z test is a hypothesis test used to test hypotheses

concerning a single population with a known variance

concerning at least one population    

concerning the variance in a population

all of the above

3. Given the following values: μ = 6.0, M = 7.6, n = 36, σ = 6, conduct a one-sample z test at a 0.05 level of significance. For a one-tailed test, upper-tail critical, what is the decision?

Statistics In Psychology

to reject the null hypothesis

to retain the null hypothesis    

There is not enough information since the sample size is not given.

4. ________ allows researchers to describe (1) how far mean scores have shifted in the population, or (2) the percentage of variance that can be explained by a given variable.




effect size

5. The ________ is an inferential statistic used to determine the number of standard deviations in a t distribution that a sample means deviates from the mean value or mean difference stated in the null hypothesis.



standard error

degrees of freedom

6. State the critical value(s) for the following two-tailed t test at a 0.05 level of significance: t(∞).



the same as for a two-tailed z test at a 0.05 level of significance

both ±1.96 and the same as for a two-tailed z test at a 0.05 level of significance

7. A researcher reports that the mean time it takes to complete an experimental task is 1.4 ± 8.0 (M ± SD) seconds. If the null hypothesis was that the mean equals 1.0, then what is the effect size for this test using estimated Cohen’s d?

d = 0.05; small effect size

d = 0.50; medium effect size

d = 1.05; large effect size

There is not enough information to answer this question.

8. Computing a two-independent sample t test is appropriate when

Statistics In Psychology

different participants are assigned to each group

the population variance is unknown    

participants are observed one time

all of the above

9. A researcher has participants rate the likability of a sexually promiscuous person described in a vignette as being male (n = 20) or female (n = 12). The mean likability ratings in each group were 4.0. If the null hypothesis is that there is no difference in likability ratings, then do likability ratings differ at a 0.05 level of significance?

Yes, this result is significant, p < 0.05.

No, this result is not significant, t(30) = 0.

No, this result is not significant, t(30) = 1.00.

There is not enough information to answer this question, because the variance in each sample is not given.

10. A type of related samples design in which participants are observed more than once is called a

repeated measures design

matched pairs design    

matched samples design

both matched pairs design and matched samples design

11. A researcher records the level of attention among 18 students during an interactive and lecture portion of a single class. If she computes a related samples test at a 0.05 level of significance (two-tailed test), then what is the critical value for this test?





12. A researcher computes the mean difference in locomotion in a sample of 12 rats before and 30 minutes after an injection of amphetamine. Rats were placed in a box with infrared beams. The number of times rats crossed the beams was used as a measure of locomotion. The mean difference in locomotion was 6.2 ± 8.4 (MD ± SD), and this difference was significant. What is the effect size for this result using estimated Cohen’s d?

d = 0.74 (medium effect)

d = 1.36 (medium effect)    

d = 0.74 (large effect)

d = 1.36 (large effect)

13. A researcher reports with 90% confidence that 31% to 37% of Americans believe in ghosts. What is the point estimate for this interval?




31% to 37%

14. In a sample of 20 participants, a researcher estimates the 95% CI for a sample with a mean of M = 5.4 and an estimated standard error (SM) of 1.6. What is the upper confidence limit for this interval?

Statistics In Psychology





15. There is no difference between a point estimate and an interval estimate.



16. Using a between-subjects ANOVA design,

n · k participants are each observed one time

n participants are observed k times    

data are not analyzed between groups

the same participants are observed in each group

17. A researcher measures attractiveness ratings of a male confederate among 30 women who were told the confederate was either single, dating, or married (n = 10 per group). What are the degrees of freedom for error for the one-way between-subjects ANOVA?





18. A researcher measures differences in romantic feelings among adolescent and adult males. If different participants were in each group, then what type of statistical design is appropriate for this study?

a two-independent sample t test

a one-way between-subjects ANOVA   

  a two-way between-subjects ANOVA

both a two-independent sample t test and a one-way between-subjects ANOVA

19. Which of the following post hoc tests is associated with the greatest power to detect an effect?

Schaffé test

Tukey’s HSD test    

Bonferroni test

Fisher’s LSD test

20. A researcher computes a one-way within-subjects ANOVA in which k = 4 and n = 20.

What are the degrees of freedom error for this test?




There is not enough information to answer this question.

21. A researcher computes the following one-way within-subjects ANOVA table for a study in which k = 3 and n = 12.

State the decision at a 0.05 level of significance.

Source of Variation    SS    df    MS    Fobt    
Between groups    450                
Between persons            20        
Within groups (error)                    
Total    1030                

Reject the null hypothesis.

Retain the null hypothesis.    

There is not enough information to answer this question.

22. There are ____ factors in a 2 × 3 ANOVA design.





23. A researcher conducts a 2 × 4 between-subjects ANOVA in which 12 participants were observed in each group. If SSB = 18 and SSE = 264 for this study, then what is the decision for Factor B at a 0.05 level of significance?

Reject the null hypothesis.

Retain the null hypothesis.    

There is not enough information to answer this question.

24. A statistical procedure used to describe the strength and direction of the linear relationship between two factors is called

effect size


  a correlation


25. A researcher measures the following correlation: r = −0.21. What is the value of the coefficient of determination?





26. A researcher measures the correlation between the frequency of self-esteem (high, low) and health status (lean/healthy, overweight/obese). Based on the frequencies for each nominal category given below, what is the value of the phi correlation coefficient?

Health Status





27. Linear regression describes the extent to which _______ predicts ________.

X; Y

the predictor variable; the criterion variable   

  the known variable; the to-be-predicted variable

all of the above

28. A researcher reports the following equation for a best-fitting straight line to a set of data points: Y hat= −1.01X + 3.24.Which value is the y-intercept?

Y hat




29. If the coefficient of determination is 0.12 and SSY = 225, then what is the sum of squares regression for an analysis of regression?




There is not enough information to answer this question.

30. A chi-square goodness-of-fit test shows that the frequencies observed fit well with those that were expected. Hence, the decision was to

reject the null hypothesis

retain the null hypothesis    

no decision was made

31. A researcher asks participants to taste each of three meals and to choose the one they like best. The same foods are in each meal, however the calorie total of each meal is different. One is low in calories, one is moderate in calories and one is high in calories. Based on the observed frequencies given below, what is an appropriate conclusion for this test at a .05 level of significance?

Type of Meal
Low CalorieModerate CalorieHigh Calorie

Participants liked the high calorie meal more than the low calorie meal.

Participants liked the low calorie meal less than the moderate calorie meal.    

Participants liked the high calorie meal more than was expected.

all of the above

32. Each of the following is an appropriate test for ordinal data, except

the Mann-Whitney U test

the chi-square goodness-of-fit test    

the one-sample sign test

the Friedman test

33. A professor ranks the grades of students in each of three sections of a statistics course. He computes H = 6.83 for the Kruskal-Wallis H test to test for differences between the sections. What is the decision for this test?

Retain the null hypothesis.

Reject the null hypothesis.    

There is not enough information to answer this question.





























Calculate the price
Make an order in advance and get the best price
Pages (550 words)
*Price with a welcome 15% discount applied.
Pro tip: If you want to save more money and pay the lowest price, you need to set a more extended deadline.
We know how difficult it is to be a student these days. That's why our prices are one of the most affordable on the market, and there are no hidden fees.

Instead, we offer bonuses, discounts, and free services to make your experience outstanding.
How it works
Receive a 100% original paper that will pass Turnitin from a top essay writing service
step 1
Upload your instructions
Fill out the order form and provide paper details. You can even attach screenshots or add additional instructions later. If something is not clear or missing, the writer will contact you for clarification.
Pro service tips
How to get the most out of your experience with Scholary Essays
One writer throughout the entire course
If you like the writer, you can hire them again. Just copy & paste their ID on the order form ("Preferred Writer's ID" field). This way, your vocabulary will be uniform, and the writer will be aware of your needs.
The same paper from different writers
You can order essay or any other work from two different writers to choose the best one or give another version to a friend. This can be done through the add-on "Same paper from another writer."
Copy of sources used by the writer
Our college essay writers work with ScienceDirect and other databases. They can send you articles or materials used in PDF or through screenshots. Just tick the "Copy of sources" field on the order form.
See why 20k+ students have chosen us as their sole writing assistance provider
Check out the latest reviews and opinions submitted by real customers worldwide and make an informed decision.
Thank you, this is an 8-week course, so I will be needing your assistance.
Customer 452919, January 20th, 2023
Thank you, the journal wa submitted today and I hope to continue receiving services.
Customer 452919, October 28th, 2021
Professional Writing Engl-3311
Thank you
Customer 452919, March 2nd, 2023
Criminal Justice
Very well and a good paper. Well worded and organized. I would like to know where the references come from
Customer 452519, June 13th, 2020
Fabulous fast service
Customer 453075, April 21st, 2022
The second attempt was an unplagiarized paper. Thank you
Customer 452545, September 25th, 2020
The presentation slides were not narrated as asked per the instructions.
Customer 452623, September 28th, 2021
Thank you for answering all of the questions provided. The last 3 discussions, I only received a grade of 14 out of 20 points. Let's see how it goes after the grades are posted next week.
Customer 452919, February 9th, 2023
Business Studies
The writer delivered as on time with quality work. But writteres communication could of been better and I would have been more content with choosing my own writer as per my assignment.
Customer 452679, March 24th, 2021
Great Job !!
Customer 453117, September 17th, 2022
English 101
well written excellent job, thank you!!
Customer 452989, December 2nd, 2021
I want to thank the entire team. Please know that I am truly grateful for your service.
Customer 452919, November 11th, 2021
Customer reviews in total
Current satisfaction rate
3 pages
Average paper length
Customers referred by a friend
15% OFF your first order
Use a coupon FIRST15 and enjoy expert help with any task at the most affordable price.
Claim my 15% OFF Order in Chat
Live Chat+1(978) 822-0999EmailWhatsApp

Order your essay today and save 30% with the discount code ESSAYHELP