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Central Tendency 1
Central Tendency 2
Measures of Variability 1
Measures of Variability 2
The Interquartile Range
100
Six students from a statistics class reported the number of hours of television they watched per week. Here are their data: 8, 10, 5, 14, 3, 6. What is the mean number of hours of television watched per week for this sample of six students?
7.67
100
The most frequently occurring score in a distribution is the:
Mode
100
The concept of variability is best described as:
the spread of the distribution of data.
100
(T/F) The standard deviation is equal to the square root of the variance.
TRUE
100
A major limitation of the range as a measure of variability is that it:
will exaggerate the variability if there are outliers in the data set.
200
Numbers that describe samples are called:
Statistics
200
Sixteen college freshmen were asked to record the number of alcoholic drinks they typically consume in a week. Here are their data: 2, 4, 6, 0, 1, 10, 9, 0, 6, 3, 6, 8, 5, 4, 6, 2. What is the mode of this distribution?
6
200
The _____ is the difference between the lowest and highest score in the distribution.
range
200
If an extreme score is added to a data set, increasing the range of data, the standard deviation will:
increase
200
What is the formula for the interquartile range?
Q3 - Q1
300
Six students from a statistics class reported the number of hours of television they watched per week. Here are their data: 8, 10, 5, 14, 3, 6. What is the median number of hours of television watched per week for this sample of six students?
7
300
A multimodal distribution has _____ mode(s).
more than two
300
Sixteen college freshmen were asked to record the number of alcoholic drinks they typically consume in a week. Here are their data: 2, 4, 6, 0, 1, 10, 9, 0, 6, 3, 6, 8, 5, 4, 6, 2. What is the range of this distribution?
10
300
Six students from a statistics class reported the number of hours of television they watch per week. Here are their data: 8, 10, 5, 14, 3, 6. What is the standard deviation of the number of hours of television watched per week for this sample of six students?
3.59
300
If the score at the 75th percentile is a 9 and the score at the 25th percentile is a 2, then the interquartile range is:
7
400
Sixteen college freshmen were asked to record the number of alcoholic drinks that they typically consume in a week. Here are their data: 2, 4, 6, 0, 1, 10, 9, 0, 6, 3, 6, 8, 5, 4, 6, 2. What is the median number of alcoholic drinks consumed per week?
4.5
400
(T/F) Numbers based on samples are called parameters.
FALSE
400
(T/F) The range is more susceptible to the influence of outliers than other measures of variability.
TRUE
400
A researcher analyzed the results of her data and calculated the standard deviation of scores at 3.5. What is the variance?
12.25
400
The second quartile, or the 50th percentile of a distribution, is also known as:
the median
500
The median is preferred over the mean for _____ distributions.
skewed
500
A unimodal distribution has _____ mode(s).
One
500
Six students from a statistics class reported the number of hours of television they watch per week. Here are their data: 8, 10, 5, 14, 3, 6. The variance of the number of hours of television watched per week for this sample of six students is:
12.89.
500
Sixteen college freshmen were asked to record the number of alcoholic drinks they typically consume in a week. Here are their data: 2, 4, 6, 0, 1, 10, 9, 0, 6, 3, 6, 8, 5, 4, 6, 2. What is the variance of the number of alcoholic drinks consumed per week?
8.75
500
Compared to the interquartile range, the range is less susceptible to the influence of outliers.
FALSE