## Stats.-Test 1

Last update by k_dog09 on 12/14/2009
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# The sum of the frequencies for all classes will always equal:a. the number of classesb. the class widthc. the total number of observations in the data setd. one

C

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A stem-and-leaf plot describes two-digit integers between 30 and 80. For one of the classes displayed, the row appears as 5|234. The numerical values being described are 25, 35, and 45.

a. True
b. Falsh
B
When a distribution has more values to the left and tails to the right, we say it is skewed to the left.

a. True
b. Falsh
B
The following data represent a sample of 10 scores on a statistics quiz:

16 16 16 16 16 18 18 20 20 20

After the mean, median, range and variance were calculated for the scores, it was discovered that one of the scores of 20 should have been an 18. Which of the following will change when the calculations are redone using the correct scores?

a. mean and range
b. median
c. mean and variance
d. variance and range
C
Which of the following randomly selected measurements, x, might be considered a potential outlier (i.e., an unusual measurement) if it was selected from the given population?

a. x=0 from a population with mu=0 and sigma=2
b. x=-5 from a population with mu=1 and sigma=4
c. x=7 from a population with mu=3 and sigma=2
d. x=4 from a population with mu=0 and sigma=1
e. x=10 from a population with mu=0 and sigma=5
D
Which one of the values below represents a lower quartile (Q1) for the data set 23, 24, 21, and 20?

a. 22.0
b. 22.5
c. 20.25
d. 23.5
C
Which of the following statements is true for the following data values: 17, 15, 16, 14, 17, 18, and 22?

a. The mean, median, and mode are all equal
b. Only the mean and median are equal
c. Only the mean and mode are equal
d. Only the median and mode are equal
A
Which of the following is not a measure of variability?

a. The variance
b. The standard deviation
c. The mean
d. The range
C
Expressed in percentiles, the interquartile range is the difference between the:

a. 20% and 80% values
b. 45% and 95% values
c. 25% and 75% values
d. 20% and 70% values
C
Tchebysheff's Theorem states that the percentage of measurements in a data set that fall within three standard deviations of their mean is:

a. 75%
b. 68%
c. 16%
d. at least 89%
D
Given a distribution of measurements that is approximately mound-shaped, the Empirical Rule states that the approximate percentage of measurements in a data set that fall within two standard deviations of their mean is approximately:

a. 99%
b. 95%
c. 90%
d. 68%
B
Which of the following summary measures is affected most by outliers?

a. The first quartile
b. The second quartile
c. The third quartile
d. The interquartile range
e. None of the above
E
Stats.-Test 1
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