Question 1 of 20 1.0 Points A sample of 20 observations has a standard deviation of 4. The sum of the squared deviations from the sample mean is: -
A. 320 -
B. 304 -
C. 288 -
D. 400
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Suppose that a histogram of a data set is approximately symmetric and "bell shaped". Approximately, what percent of the observations are within three standard deviations of the mean? -
A. 50% -
B. 99.7% -
C. 95% -
D. 68%
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Which of the following correctly describes the relationship between a sample and a population? -
A. A sample is a group of populations that are subject to observation. -
B. A population and a sample are not related. -
C. A population is a group of samples that may or may not be included in a study -
D. A sample is a group of subjects selected from a population to be studied.
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A histogram that has a single peak and looks approximately the same to the left and right of the peak is called: -
A. bimodal -
B. symmetric -
C. proportional -
D. balanced
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Which of the following statements is true for the following data values: 7, 5, 6, 4, 7, 8, and 12? -
A. Only the mean and median are equal -
B. The mean, median and mode are all equal -
C. Only the median and mode are equal -
D. Only the mean and mode are equal
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If a variable has possible values –2, 6, and 17, then this variable is Reset Selection |

Which of the following statements is true regarding the data set 10, 10, 10, 10, and 10? Reset Selection |

Gender and State are examples of which type of data? -
A. Discrete data -
B. Continuous data -
C. Categorical data -
D. Ordinal data
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If a value represents the 95th percentile, this means that -
A. 95% of the time you will observe this value -
B. 95% of all values are below this value -
C. 95% of all values are above this value -
D. there is a 5% chance that this value is incorrect
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A scatter plot would be useful for -
A. Showing the trend of sales, over time, of five different brands of blank DVDs -
B. Showing the relationship between the sales of blank CDs and blank DVDs -
C. Showing the top selling brands of blank DVDs -
D. Showing the relative number of sales of four different brands of blank DVDs
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Which of the following indicates how many observations fall into various categories? -
A. The frequency table -
B. The tabulation scale -
C. The Likert scale -
D. The sample table
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Which of the following are the three most common measures of central location? -
A. Mean, median, and standard deviation -
B. Mean, median, and mode -
C. Mean, variance, and standard deviation -
D. Mean, median, and variance
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