Exam 13: Big Data Basics: Describing Samples and Populations

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Find the approximate standard deviation of the following set of scores: 3, 6, 2, 7, 8.

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B

In computing a 95 percent confidence interval about a proportion for a sample size of 40, the appropriate Z-value to be used is ____________________.

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1.96

When you add up a set of scores and divide the result by the number of scores, you have determined the ____________________ of the distribution.

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mean

Three factors are required to specify sample size: (1)the variance of the population; (2)the population mean; and (3)the confidence level.

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The central limit theorem prevents inferential statistics from being used.

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Percentage frequency is the long-run relative frequency with which an event will occur.

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The mean is simply the arithmetic average.

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A frequency distribution organized into a table or graph that summarizes percentage values associated with particular values of a variable is called a(n)____________________.

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When a data set is summarized by counting the number of times each value for a variable occurs in the sample, this is known as a ____________________.

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A confidence interval estimate is a specified range of numbers within which a population mean is expected to lie.

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Measured characteristics of a specific population are called ____________________.

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The value which occurs most often is called the ____________________ score.

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Which of the following refers to the proportion of respondents who choose the most positive choice in a multiple choice question?

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Traditionally, market researchers have used the ____________________ percent confidence level in research studies.

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Which of the following is the symbol for the sample standard deviation?

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Suppose the average units produced in a month by a Ford Motor Co.plant for Ford Explorers is 22, but only 18 Explorers are produced on a given day in that same month.Then, the deviation score for this one day is ____.

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The standardized normal distribution has a mean of 1.0 and a standard deviation of zero.

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The idea that as sample size increases, the distribution of sample means of samples of size n, when randomly selected, approaches a normal distribution is known as the ____________________.

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An estimate of the population mean in the form of a single value, usually the sample mean, is called a ____.

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The value below which half the values in a distribution fall is the ____.

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