Exam 13: Big Data Basics: Describing Samples and Populations

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Nicole has created a table that summarizes the number of times a particular value of a variable occurs.Nicole has created a ____ distribution.

(Multiple Choice)
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Population parameters are computed from sample data.

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If between 125 and 150 units of a product have been produced each day during the past month, the range of this production is 25 units.

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Suppose a population mean is assumed to be 20 and the sample standard deviation is 5.Then, a score of 15 would have a Z-value of approximately ____.

(Multiple Choice)
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Which theorem states that as sample size increases, the distribution of sample means of size n, randomly selected, approaches a normal distribution?

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____ is the percentage of elements that meet some criterion for membership in a category.

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Describe the measures of dispersion and explain why standard deviation is used most often.

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Name and describe the measures of central tendency.

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In a test marked study, 206 out of a sample of 560 people state that they "liked" the product being studied.The proportion of people in this study who said that they liked this product was about:

(Multiple Choice)
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_____________ variables are those that the researcher should build into a survey that allow a comparison between sample units that do respond and those that do not respond.

(Short Answer)
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Which of the following is the symbol for the population standard deviation?

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Discuss confidence intervals

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A researcher must calculate the sample mean to calculate the confidence intervals.

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The confidence interval increases as the sample size, n, increases.

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The midpoint of a set of numbers is referred to as the _____.

(Multiple Choice)
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When a researcher wants to estimate national market share based on the results of the test market for a new product in St.Louis and Kansas City, this is an example of:

(Multiple Choice)
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The range of numbers within which the population mean is expected to lie 95 percent of the time referred to as a(n)____________________ estimate.

(Short Answer)
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The simplest measure of the dispersion of a set of scores is the ____________________.

(Short Answer)
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The primary purpose of inferential statistics is to make a judgment about a population.

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A cross reference is an estimate of the population mean in the form of a single value.

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