Download Descriptive Statistics Self

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Descriptive Statistics
Self-Assessment
In the following multiple choice questions, circle the correct answer.
(Then check your answers on the back)
1.
Which of the following provides a measure of central location for the data?
a. standard deviation
2.
b. mean
b. sample parameter
Given the formula for the Coefficient of Variation =
c. sample statistic
𝑆𝑆𝑆𝑆×100
𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀
The hourly wages of a sample of 130 system analysts are given:
What does the coefficient of variation equal?
a. 0.30%
4.
b. 30%
b. 24
b. mean
d. 28,461
c. 50th percentile
d. all of the above answers are correct
b. absolute dispersion
c. central location
d. relative location
b. second quartile
c. third quartile
d. fourth quartile
The difference between the largest and the smallest data values is called the:
a. variance
9.
c. 576
The 75th percentile is referred to as the:
a. first quartile
8.
d. 54%
The median is a measure of:
a. relative dispersion
7.
c. 5.4%
range = 20
variance = 324
The median of a sample will always equal the:
a. mode
6.
mean = 60
mode = 73
median = 74
d. population mean
The variance of a sample of 169 observations equals 576. The standard deviation of the sample equals:
a. 13
5.
d. range
A numerical value used as a summary measure for a sample, such as sample mean, is known as a:
a. population parameter
3.
c. variance
b. interquartile range
c. range
d. coefficient of variation
The first quartile:
a. contains at least one third of the data elements.
b. is the same as the 25th percentile.
Descriptive Statistics
c. is the same as the 50th percentile.
d. is the same as the 75th percentile.
10/2013 @ SLC
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10. Which of the following is not a measure of central tendency?
a. mean
b. median
c. variance
d. mode
11. Which of the following is a measure of dispersion?
a. percentiles
b. quartiles
c. interquartile range
d.
all of the above are measures of dispersion
12. The most frequently occurring value of a data set is called the:
a. range
b. mode
c. mean
d. median
13. The interquartile range is:
a. the 50th percentile.
b. another name for the variance.
c. the difference between the largest and smallest values.
d. the difference between the third quartile and the first quartile.
14. When the data are skewed to the right, the measure of Skewness will be:
d. one
8.
9.
10.
11.
12.
13.
14.
c. positive
b
c
b
b
c
c
c
b. zero
1.
2.
3.
4.
5.
6.
7.
a. negative
c
b
c
c
b
d
c
Answers:
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Descriptive Statistics
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