stats ch 3 quiz
The standard deviation for the numbers 8, 9, and 10 is: .67 0.0 -3.0 1.0
1.0
The variance can best be thought of as the: average of the deviations from the median. average of the absolute deviations from the mean. square of the mean. average of the squared deviations from the mean.
average of the absolute deviations from the mean.
For the data set [1, 3, 3, 5, 5, 5, 7, 7, 9], the value "5" is: the median. the mode. all of the above the mean.
d) all of the above
The best measure of central tendency: is the median. is the mode. depends on the data and the question you want to ask. is the mean.
depends on the data and the question you want to ask.
If we eliminate the top and bottom 25% of the data and take the range of what remains we have the: interquartile range quartile variance adjusted range range
interquartile range
The chief disadvantage of the median, when compared to the mean, is that its location cannot be calculated algebraically. it is less stable than the mean from sample to sample. it has no disadvantages. it is disproportionately affected by outliers.
it is not disproportionately affected by extreme scores
If a physics professor gave her class the same exam every year, which of the following measures of exam scores would probably stay the most consistent in value from year to year? mode mean median none of the above
mean
The measure of central tendency that is most useful in estimating population characteristics because it is less variable from sample to sample is the: All of the above are equally useful in estimating characteristics of the population. median mode mean
mean
When the distribution is symmetric and unimodal, which of the following are always equal? mean and mode mean, median, and mode median and mode mean and median
mean and the median
Alison received a score of 480 on the verbal portion of her SAT. If she scored at the 50th percentile, her score represents the _______ of the distribution of all verbal SAT scores. Question options: mean mode median average
median
If a store manager wanted to stock the men's clothing department with shirts fitting the most men, which measure of central tendency of men's shirt sizes should be employed? average mean mode median
mode
Data points that lie outside the whiskers in a boxplot are often referred to as: Question options: representative values. incorrect values. deviates. outliers.
outliers
If we know that a set of test scores has a mean of 75 and a standard deviation of 8, we would conclude that: You can't tell anything about how scores lie relative to the mean. the average deviation from the mean is about 8 points. more people are above 75 than below it. the average person will have a score of 75 + 8 = 83.
the average deviation from the mean is about 8 points.
The median location is: Question options: the position, in an ordered series, occupied by the median. the number closest to the mean. the number of scores that occur at the median. the highest point on a frequency distribution.
the position, in an ordered series, occupied by the median.
The difference between the lowest to the highest score in a distribution is the range. TrueFalse
true
