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If we consider the simple random sampling process as an experiment, the sample mean is
选项：

A:always zero;
B:always smaller than the population mean;
C:a random variable;
D:exactly equal to the population mean

发布时间：2024-05-16 20:28:42

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1.Suppose a population has a mean of 90 and a standard deviation of 28. If a random sample of size 49 is drawn from the population, the probability of drawing a sample with a mean of more than 95 is _______.
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11.The population parameter in the null hypothesis _____.选项： A: is always greater than zero; B:is always equal to zero; C:is always less than zero; D:is not always equal to zero
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14.A researcher is interested in testing to determine if the mean of population one is greater than the mean of population two. The null hypothesis is that there is no difference in the population means (i.e. the difference is zero). The alternative hypothesis is that there is a difference (i.e. the difference is not equal to zero). He randomly selects a sample of 9 items from population one resulting in a mean of 14.3 and a standard deviation of 3.4. He randomly selects a sample of 14 items from population two resulting in a mean of 11.8 and a standard deviation 2.9. He is using an alpha value of .10 to conduct this test. Assuming that the populations are normally distributed, the degrees of freedom for this problem are _______.选项： A:23 B:22 C:15 D:2
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If we consider the simple random sampling process as an experiment, the sample mean is 选项： A:always zero; B:always smaller than the population mean; C:a random variable; D:exactly equal to the population mean

If we consider the simple random sampling process as an experiment, the sample mean is
选项：

A:always zero;
B:always smaller than the population mean;
C:a random variable;
D:exactly equal to the population mean