PSYC 354 Homework 4 Liberty University

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.

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 won the grand prize

and a total of 266 people have competed. Estimate the

probability of winning the grand prize.

5.28- Convert the following proportions to percentages:

a. 0.0173 

b. 0.8 

c. 0.3719

5.29- Convert the following percentages to proportions:

a. 62.7% 

b. 0.3% 

c. 4.2% 

b) Compute descriptive statistics for this data. Which measure of central tendency would you use to describe this data and why? 

c) Enter the data in a new SPSS file. Create the correct type of graph to display this data, and justify your choice of graph