Math homework help

Question 1 of 20

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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

Question 2 of 20

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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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Question 3 of 20

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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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Question 4 of 20

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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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Question 5 of 20

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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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Question 6 of 20

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If a variable has possible values –2, 6, and 17, then this variable is

A. both a continuous and a discrete variable
B. a discrete variable
C. neither a continuous nor a discrete variable
D. a continuous variable

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Question 7 of 20

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

A. The range is zero
B. The standard deviation equals zero
C. The interquartile range equals zero
D. all of the above

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Question 8 of 20

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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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Question 9 of 20

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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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Question 10 of 20

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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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Question 11 of 20

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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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Question 12 of 20

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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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Part 2 of 3 –

Question 13 of 20

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