CRIM 483
Chapter 3- Variability Homework
1. A measure of how much each score in a group of scores differs from the mean is
a. variability
b. the mean
c. the median
d. the mode
2. The range for the following scores is: 29, 48, 22, 37, 55
a. 26
b. 33
c. 37
d. -33
3. The most frequently used measure of variability is the
a. range
b. variance
c. mean
d. standard deviation
4.
If n = 24 and s = 1.56, then the variance equals
a. 2.43
b. 1.25
c. 0.06
d. 0.065
5. A teacher is interested in variability of student test scores. What is the unbiased
standard deviation of the following test scores? The scores are: 4, 5, 2, 6, 8, 3.
6. Here is a set of cognitive ability scores: 103, 112, 97, 126, 100, 131. Assess
variability (range, standard deviation and variance).
Chapter 7- Normal Curve Homework
1. Asymptotic means
a. the tails of distribution are equal in length
b. the tails of a normal curve come closer and closer to the horizontal axis,
but never touch it
c. there is only one “hump” in a distribution
d. the distribution is normal
2. If a distribution has a mean of 35 and a standard deviation of 5, what value would be 2.5 standard deviations from the mean?
a. 35
b. 20
c. 22.5
d. 47.5
3. What percentage of scores falls between the following z scores: -1 to +1; -1 to +2; -1
to +3?
4. What is the area between a raw score of 113 and 126 in a normal distribution with a
mean of 100 and a standard deviation of 10?
5. What is the area between a raw score of 97 and 107 in a normal distribution with a
mean of 100 and a standard deviation of 10?