20.
Normally distributed data are normally referred to as:
A.
Bell-shaped
B.
Asymmetrical
C.
Skewed
D.
Peaked
21.
Take the formula Z = (X – µ)/σ, where µ is the mean of the population, X is the value of the
element, Z is the z-score and σ is the standard deviation. What does this formula calculate?
A.
Confidence interval.
B.
Standard score.
C.
Standard error of the mean.
D.
Variance.
22.
A population has a mean of μ=35 and a standard deviation of σ=5. After 3 points are added
to every score in the population, what are the new values for the mean and standard
deviation?
A.
μ=35 and σ=5
B.
μ=35 and σ=8
C.
μ=38 and σ=5
D.
μ=38 and σ=8
23.
Of the following Z-score values, which one represents the location closest to the mean?
A.
Z=+0.5
B.
Z=+1,0
C.
Z=-1.5
D.
Z=-0.3
24.
If the scores on a test have a mean of 26 and a standard deviation of 4, what is the
z
-score
for a score of 18?
A.
2
B.
11
C.
-2
D.
–1.41
25.
A population has a μ=50 and σ=10. If these scores are transformed into z-scores, the
population of z-scores will have a mean and standard deviation of:
A.
μ=50 and σ=10
B.
μ=50 and σ=1,96
C.
μ=1 and σ=0
D.
μ=0 and σ=1