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Key Terms
Formulas
Do the Math!
Margins of Error
100
What does X represent?
What is raw scores
100
What is the formula to calculate the z-score?
What is Z=(x-M)/S
100
M= 70 SD= 10 X=60 What is the z score?
What is -1
100
Describe Gallup's method.
What is collecting phone records, calling a particular number until a particular person in that household answers to gather data
200
What does M represent?
What is population mean
200
What is the formula to calculate X?
What is X=Z(S)+M
200
M= 50 SD= 5 Z=2 Solve for X
What is 60
200
What is sampling?
What is the process of taking a smaller group of participants/scores from a larger population
300
What does S represent?
What is standard deviation of a population
300
What is the formula to calculate the standard deviation of a sample?
What is s=SQRT of the summation of (x-m)^2/(n-1)
300
M= 21 SD= 10 Z=.7 Find the percentile rank
76%
300
What does standard error measure?
What is measuring the variability of a distribution of sample means
400
What does s represent?
What is standard deviation of a sample
400
What is the formula to calculate SEm?
What is SEm=s/SQRT of n
400
M= 1,020 SD= 500 X=1,620 What is the z score?
What is 1.2
400
What is the percentage of the mean +/- 1 standard error?
What is 68% confidence interval
500
What does n represent?
What is the number of cases in a sample
500
To find percentile scores, what would you use?
What is a Z table
500
M=5 SD= 1.5 X=8 Find the z score.
What is 2
500
What is the percentage of the mean +/- 2 standard error?
What is 95% confidence interval