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1     Calculate the standard deviation of the following scores using the formula and steps found in Keyton’s online appendix. Make sure that your answer goes out to two decimal places even if it is a round number. The scores for the variable X are below.

9

6

5

7

2

9

7

9

7

3

2) Provide the z-score for the following data. The formula is (score-mean)/sd, and is in your notes.

Mean = 52

Standard deviation = 35

Raw score = 72

Your answer should be rounded to 2 decimal places.

3) For the following data, compute the percentage of cases that lie below or to the left of the z-score that is obtained when X = 50, sd = 10, and mean = 40

Your answer must be in decimal form

4) For the following data, compute the percentage of cases that lie between X = 100 and

Y= 300, with mean = 200 and sd = 100.

5) Imagine an election with just two candidates. Candidate A asks her consultant to conduct a poll to see if she (Candidate A) is leading. What is the “null hypothesis” value that is being “tested” in this example?

Your answer must be expressed as a decimal out to 2 places

6) What is the level of measurement for the political poll in question 1?

a)Ratio

b)nominal

c)interval

d) ordinal

7) Candidate A’s pollster conducted a survey in which 480 out of 740 respondents indicated they would probably vote for Candidate A. Compute the confidence interval for the population.

8) Imagine a researcher is interested in frequency of self-disclosure and measures self-disclosure from a sample of undergraduate were asked to get to know one another. Researchers recorded the conversations and counted the number of self-disclosures. What level of measurement is self-disclosure in this example?

A) ordinal

B) interval

c) nominal

d) ratio

9) The “study” from the previous question produced the following data: N = 120, mean = 7.5 and standard deviation = 3.20. From these data, compute the confidence interval for the mean.

10) For the following data, compute the percentage of cases that lie above or to the right of the z-score that is obtained when X = 5, sd = 2, and mean = 6.

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