 PSYC 354 PSYC354 Module 4 Homework 4 (Liberty University)

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PSYC 354 Module 4 Homework 4

Homework 4

Sampling and Probability

Be sure you have reviewed this module/week’s lessons and presentations along with the practice data analysis before proceeding to the homework exercises. Complete all analyses in SPSS, and then copy and paste your output and graphs into your homework document file. Number all responses. Answer any written questions (such as the text-based questions or the APA Participants section) in the appropriate place within the same file. Review the “Homework Instructions: General” document for an example of how homework assignments must look.

Part I: Concepts

These questions are based on the Nolan and Heinzen reading and end-of-chapter questions.

1. A(n) ________ sample occurs when everyone in the population has the same chance of being selected.

2. The ability to apply research findings to contexts or samples other than the one studied is called _______.

3. The duplication of the results of a research study in a different context or with a different sample is called ________.

4. Your own estimate of the likelihood that you will uphold your New Year's resolution is known as a(n) ________.

5. Expected relative-frequency is computed as the number of ________ divided by the number of ________.

6. The ________ group is the group receiving the intervention or treatment of interest.

7. A statement that 2 populations are different from one another is a(n) ________ hypothesis.

8. If you find that the groups you studied differed from each other more than would be expected by chance alone, you ________ the null hypothesis.

9. When you reject the null hypothesis but the null hypothesis is in fact true, you have made a(n) _______ error.

10. When you fail to reject the null hypothesis but the null hypothesis is false, you have made a(n) _______ error.

11. Researchers were interested in whether touch therapy improves the weight gain of preterm infants and compared the weight gain over a 3-week period of infants receiving touch therapy to the weight gain of infants not receiving touch therapy. a. What is the likely null hypothesis for this experiment? b. What is the likely research hypothesis for this experiment?

12–15. Complete the Nolan and Heinzen end-of-chapter Exercises 5.26, 5.27, 5.28, and 5.29.

12-15 Exercises

5.26   What is the probability of hitting a target if, in the long run, 71 out of every 489 attempts actually hit the target?

5.27   On a game show, 8 people have complete. Estimate the probability of winning the grand prize.

5.28 Convert the following proportions to percentages:

5.29   Convert the following percentages to proportions:

Parts II and III: There is no new SPSS material this module/week.

Part IV: SPSS Cumulative

1. The final grades for students in a freshman seminar are shown below.

 Grade 99.00 93.00 89.00 86.00 82.00 79.00 78.00 76.00 75.00 75.00 73.00 72.00 69.00 65.00 63.00 55.00 50.00

1. Create the appropriate SPSS graph to show the distribution of students’ grades.
2. Compute descriptive statistics for this data. Which measure of central tendency would you use to describe this data and why?

2. The overall livability ratings of 12 US cities appear below. The data are taken from this livability calculator.

 City Livability Rating Boston Austin Chicago Pittsburgh Los Angeles Jackson, MS Detroit Miami New York Houston Atlanta Seattle 73 83 73 75 75 72 67 71 73 79 78 77

1. Enter the data in a new SPSS file. Create the correct type of graph to display this data, and justify your choice of graph.
2. What kind of variable is “City”? What kind of variable is “Livability Rating”?

Submit Homework 4 by 11:59 p.m. (ET) on Monday of Module/Week 4.

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