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Statistical independence means the outcome of one event is independent of the outcome of a second event。
A.正确
B.错误
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If the population distribution is unknown, in most cases the sampling distribution of the mean can be approximated by the normal distribution if the sample size is at least 15 observations。
A.正确
B.错误
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X is a discrete random variable that can have values from 0 to infinity, and occurrences of the events X counts are independent. The standard deviation of X is equal to the square root of the mean. The probability distribution of X is a(n)()distribution.
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The empirical rule tells us that approximately of the values cluster within a distance of 1 standard deviation from the mean for a bell-shaped distribution
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The reason that we prefer the sample standard deviation as our measure of typical variation instead of the sample variance is that ()
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deviation is the distance between a () and the ().v
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In a multiple regression analysis model involving 2 independent variables and 15 observations, SSR = 268 and SST = 325. The adjusted coefficient of determination is
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In order to test for the significance of a regression model involving 14 independent variables and 255 observations, the numerator and denominator degrees of freedom(respectively)for the critical value of F are
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If two variables, X and Y, have a strong linear relationship, then
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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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Exhibit 2 The following represents the probability distribution for the daily demand of computers at a local store.
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