sss5182q
dav_r_
ssss5812qqq.docxQUESTION 1
· A portion of the population selected to represent the population is called
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· statistical inference |
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· Data and Statistics |
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· a census |
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· a sample |
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5 points
QUESTION 2
· The process of analyzing sample data in order to draw conclusions about the characteristics of a population is called
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· Data and Statistics |
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· statistical inference |
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· data analysis |
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· data summarization |
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5 points
QUESTION 3
· A numerical value used as a summary measure for a sample, such as sample mean, is known as a
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· population parameter |
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· sample parameter |
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· sample statistic |
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· population mean |
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5 points
QUESTION 4
· The set of all possible sample points (experimental outcomes) is called
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· a sample |
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· an event |
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· the sample space |
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· a population |
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QUESTION 5
· A numerical description of the outcome of an experiment is called a
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· descriptive statistic |
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· probability function |
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· variance |
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· random variable |
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5 points
QUESTION 6
· A description of the distribution of the values of a random variable and their associated probabilities is called a
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· probability distribution |
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· random variance |
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· random variable |
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· expected value |
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5 points
QUESTION 7
· Which of the following is not a characteristic of the normal probability distribution?
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· The mean, median, and the mode are equal |
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· The mean of the distribution can be negative, zero, or positive |
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· The distribution is symmetrical |
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· The standard deviation must be 1 |
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5 points
QUESTION 8
· A theorem that allows us to use the normal probability distribution to approximate the sampling distribution of sample means and sample proportions whenever the sample size is large is known as the
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· approximation theorem |
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· normal probability theorem |
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· central limit theorem |
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· central normality theorem |
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5 points
QUESTION 9
· The value added and subtracted from a point estimate in order to develop an interval estimate of the population parameter is known as the
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· confidence level |
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· margin of error |
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· parameter estimate |
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· interval estimate |
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5 points
QUESTION 10
· Whenever the population standard deviation is unknown and the population has a normal or near-normal distribution, which distribution is used in developing an interval estimation?
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· standard distribution |
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· z distribution |
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· alpha distribution |
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· t distribution |
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5 points
QUESTION 11
· The level of significance
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· can be any positive value |
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· can be any value |
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· is (1 - confidence level) |
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· can be any value between -1.96 to 1.96 |
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10 points
QUESTION 12
· When the p-value is used for hypothesis testing, the null hypothesis is rejected if
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· p-value ≤ α |
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· α < p-value |
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· p-value ≥ α |
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· p-value = 1 - α |
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10 points
QUESTION 13
· The p-value is a probability that measures the support (or lack of support) for the
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· null hypothesis |
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· alternative hypothesis |
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· either the null or the alternative hypothesis |
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· sample statistic |
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10 points
QUESTION 14
· The coefficient of correlation
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· is the square of the coefficient of determination |
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· is the square root of the coefficient of determination |
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· is the same as r-square |
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· can never be negative |
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10 points
QUESTION 15
· Regression analysis is a statistical procedure for developing a mathematical equation that describes how
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· one independent and one or more dependent variables are related |
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· several independent and several dependent variables are related |
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· one dependent and one or more independent variables are related |
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· None of these alternatives is correct. |
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10 points
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