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.   80
D.   56
Question #2
A population has a mean of µ = 12 and ∑x = 240. How many scores are in the population?
A.   2880
B.   20
C.   None of these
D.   10
Question #3
Identify the two factors that determine which measure of central tendency is more appropriate to use and when:
A.   Shape of distribution and population.
B.   Scale of measurement and population
C.   Scale of measurement and shape of distribution
D.   Population or sample
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.   42 and 58
C.   34 and 50
D.   34 and 66
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 shape of distribution
B.   Scale of measurement and population
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.   20
D.   none of these
Question #7
A sample of n = 4 scores, has µ = 8 and SS = 9. What is the sample variance?
A.   36
B.   2.25
C.   32
D.   3
Question #8
Calculate variance and standard deviation for the following sample of scores: 2, 4, 4, 8, 12
A.   none of these
B.   s=3; s2=9
C.   s=2; s2=4
D.   s=4; s2=16
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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