PSYC354 Homework 8 complete solutions correct answers key
Single-Sample T-Test
When submitting this file, be sure the filename includes your full name, course and section. Example: HW8_JohnDoe_354B01
Be sure you have reviewed this module/week’s lesson and presentations along with the practice data analysis before proceeding to the homework exercises. Complete all analyses in SPSS, then copy and paste your output and graphs into your homework document file. Answer any written questions (such as the text-based questions or the APA Participants section) in the appropriate place within the same file.
Part I: Concepts
Questions 1–3
These questions are based on the Nolan and Heinzen reading and end-of-chapter questions.
Part I: Questions 1a-1g
Fill in the highlighted blanks with the best word or words.
1-a)
You use a t-test when you know the population __mean______ but not the population __standard deviation______.
1-b)
The t-statistic indicates the distance of a sample mean from the __population mean______ in terms of estimated standard error units.
1-c)
The 2 groups compared in the single-sample t-test are the sample and the __population______.
1-d)
The number of scores that are free to vary when you are estimating a population parameter from a sample is called the __degrees of freedom______.
1-e)
A researcher reports the results of a single-sample t-test as t(46) = 2.37. The degrees of freedom for this t-test are __58____, which means there were 59 total participants in the researcher’s sample.
1-f)
Based on the t tables, the critical values of the t-statistic for a two-tailed test with df = 11 and a p level of 0.05 are ____+2.262____.
1-g)
When your t-statistic in your results exceeds your critical cutoffs, you __reject______ the null hypothesis.
Part I: Question 2-3
End-of-chapter problems:
Complete the following exercises. If applicable, remember to show work in your homework document to receive partial credit.
2)
Explain what each part of the following statistical phrase represents, as it would be reported in APA format: t(8) = 2.98, p = .03
t
Answer
8
Answer
2.98
Answer
p
Answer
.03
Answer
3)
Calculate the critical degrees of freedom and identify the critical t value for a single-sample t test in each of the following situations:
3-a) Two-tailed test, N = 10, p = .10
df= Answer
critical t = Answer
3-b) Two-tailed test, N = 36, p = .05
df= Answer
critical t = Answer
3-c) One-tailed test, N = 81, p = .01
df= Answer
critical t = Answer
Part II: SPSS Analysis
Module/Week 8 Exercise File 1
Open the “Module/Week 8 Exercise File 1” document (found in the course’s Assignment Instructions folder) in order to complete these exercises.
Part II:
Exercises 1-3
Use file: Module/Week 8 Exercise File 1
• The anger scores for 6 fictional Marines following a month-long exercise are entered in the Module/Week 8 Exercise File 1 document (found in the Assignment Instructions folder).
• Using these data, run 3 single-sample t-tests to compare the Marines’ mean anger score to the following population values:
Population mean anger scores
Population of college men: ì = 8.1
Population of adult men: ì = 9.5
Population of male psychiatric outpatients: ì = 12
• For each test, paste the output and write a Results section in current APA style
o As demonstrated in the presentation and in the textbooks.
• There will be 3 sets of output and 3 results sections using this data set
o 1 for each test involving a different population mean.
1-a)
Population of college men: ì = 8.1.
Answer: SPSS output of the t-Test
1-b)
Write a results section in current APA style describing the outcome.
All homework results sections must follow the example given in the SPSS presentation. Results sections are paragraphs and must include the APA-formatted statistical statement.
Answer
2-a)
Population of adult men: ì = 9.5
Answer: SPSS output of the t-Test
2-b)
Write a results section in current APA style describing the outcome. See (1b) for details.
Answer
3-a)
Population of male psychiatric outpatients: ì = 12
Answer: SPSS output of the t-Test
3-b)
Write a results section in current APA style describing the outcome. See (1b) for details.
Answer