All bell-shaped curves _________.
a. are normal curves c. are symmetrical
b. have means = 0 d. a and c
A distribution of raw scores is positively skewed. You want to transform it so that it is normally distributed. Your friend, who fancies herself a statistics whiz, advises you to transform the raw scores to z scores; that the z scores will be normally distributed. You should _________.
a. ignore the advice because your friend flunked her last statistics test
b. ignore the advice because z distributions have the same shape as the raw scores.
c. take the advice because z distributions are always normally distributed
d. take the advice because z distributions are usually normally distributed
You have just received your psychology exam grade and you did better than the mean of the exam scores. If so, the z transformed value of your grade must
a. be greater than 1.00
b. must be greater than 0.00
c. have a percentile rank greater than 50
d. can't determine with information given
e. must be greater than 0.00 and have a percentile rank greater than 50.
On a test with a population mean of 75 and standard deviation equal to 16, if the scores are normally distributed, what percentage of scores fall between 70 and 80?
a. 75.66
b. 70 23
c. 24.34
d. 23.57
e. 12.17
On a test with a population mean of 75 and standard deviation equal to 16, if the scores are normally distributed, what percentage of scores fall below a score of 83.8?
a. 55.00
b. 79.12
c. 20.88
d. 29.12
e. 70.88
On a test with a population mean of 75 and standard deviation equal to 16, if the scores are normally distributed, what is the percentile rank of a score of 56?
a. 58.30
b. 0.00
c. 25.27
d. 38.30
e. 11.70
A standardized test has a mean of 88 and a standard deviation of 12 . What is the score at the 90th percentile? Assume a normal distribution.
a. 90.00 c. 103.36
b. 112.00 d. 91.00
How much would your income be if its z score value was 2.58?
a. 10,000
b. 9,999
c. 5,000
d. cannot be determined from information given
Would you rather have an income (assume a normal distribution and you are greedy) _________.
a. with a z score of 1.96 c. with a z score of -2.00
b. in the 95th percentile d. with a z score of 0.000
In a normal distribution approximately _________ of the scores will fall within 1 standard deviation of the mean.
a. 14 c. 70
b. 95 d. 83
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