Quiz Chap-1
1: Classifying students in a statistics course by their gender is an example of what scale of
measurement?
a. Nominal
b. Ordinal
c. Interval
d. Ratio
2: The following are the grades a professor gave on the first test in a statistics class: 52, 90, 88, 61, 75,
82, 75, 83, 88, and 86.What was the median score on this test?
a. 82
b. 82.5
c. 78.5
d. 88
3: A clothes store manager has sales data of trouser sizes for the last month's sales. Which
measure of central tendency should the manager use, if the manager is interested in the most sellable
size?
a. mean
b. median
c. mode
d. standard deviation
4: When do the mean, median and the mode have approximately the same value?
a. always
b. never
c. in all symmetric distributions
d. only in symmetric discrete distributions
5: A market research company has collected data on the price of a particular brand of soap in several
different locations. The prices are as follows: $0.89, 0.95, 1.25, 1.36, 1.49, 1.65, 1.79, 1.89, 1.99. What
are the upper and lower quartiles of soap prices for this brand?
a. 1.72, 1.17
b. 1.84, 1.17
c. 1.72, 1.10
d. 2.21, 0.74
e. 1.84, 1.10
6: What measure of central tendency is most sensitive to skewness?
a. Mode
b. Median
c. Mean
d. They are all about the same
7: The number of bottles filled each day in a bottling plant is observed for a week: 674, 589, 613, 689,
554, 586, and 594. What was the mean?
a. 585
b. 670
c. 586.29
d. 614.14
8: The number of bottles filled each day in a bottling plant is observed for a week: 674, 589, 613, 689,
554, 586, and 594. What was the standard deviation?
a. 24
b. 45.72 (My Guess)
c. 49.39(Answer)
d. 2090.69
9: Compute the geometric mean for: 8, 5 and 3.
a. 4.93
b. 10.95
c. 5.333
d. 5.00
10: If a given distribution is known to be bell-shaped and symmetric, what percent of the observations
are expected to fall within two standard deviations of the mean?
a. 68%
b. 75%
c. 89%
d. 95%
11: A measure of the degree of asymmetry of a frequency distribution is called?
a. kurtosis
b. skewness
c. coefficient of variation
d. standard deviation
12: A survey in which customers taste five different brands of ice cream, and rank their favorites from 1
to 5, would be an example of which type of scale of measurement?
a. nominal
b. ordinal
c. interval
d. ratio