Statistics 101 - Statistics for Social Sciences » Fall 2021 » Unit 2 Quiz
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Question #1
A sample has n = 7 scores and a mean of M = 8. One new score was added to the sample and the new mean is M = 10. What is the value of the sum of scores (𝝨x)?
A.
10
B.
8
C.
56
D.
80
Question #2
A population has a mean of µ = 12 and ∑x = 240. How many scores are in the population?
A.
2880
B.
10
C.
20
D.
None of these
Question #3
Identify the two factors that determine which measure of central tendency is more appropriate to use and when:
A.
Population or sample
B.
Scale of measurement and population
C.
Scale of measurement and shape of distribution
D.
Shape of distribution and population.
Question #4
A distribution has a µ = 50 with a σ = 8. What scores are represented at ± 2 standard deviation?
A.
50 and 66
B.
34 and 50
C.
34 and 66
D.
42 and 58
Question #5
Identify the two factors that determine which measure of central tendency is more appropriate to use and when:
A.
Scale of measurement and population
B.
Scale of measurement and shape of distribution
C.
Population or sample
D.
Shape of distribution and population
Question #6
A population has a mean of µ = 12 and ∑x = 240. How many scores are in the population?
A.
10
B.
2880
C.
none of these
D.
20
Question #7
A sample of n = 4 scores, has µ = 8 and SS = 9. What is the sample variance?
A.
3
B.
32
C.
2.25
D.
36
Question #8
Calculate variance and standard deviation for the following sample of scores: 2, 4, 4, 8, 12
A.
none of these
B.
s=4; s2=16
C.
s=2; s2=4
D.
s=3; s2=9
Question #9
Percentiles are a type of____________ statistic even though they do not summarize an entire distribution but rather is used to locate individual scores within a distribution of scores.
A.
parameter
B.
descriptive
C.
population
D.
inferential
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