## (Solved) 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...

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1 Calculate the standard deviation of the following scores using the formula and steps
found in Keytonâ€™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
3) For the following data, compute the percentage of cases that lie below or to the left of the zscore that is obtained when X = 50, sd = 10, and mean = 40
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 â€œnull hypothesisâ€ value that is being
â€œtestedâ€ 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 Aâ€™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 selfdisclosure 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 â€œstudyâ€ 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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