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题目
题目

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单项选择题

Random samples of size 49 are taken from a population that has 200 elements, a mean of 180, and a variance of 169. The distribution of the population is unknown. The mean and the standard error of the distribution of sample means are _____.

选项
A.180 and 1.62
B.180 and 1.74
C.180 and 24.39
D.None of the other three
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标准答案
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思路分析
We start by identifying the key parameters of the sampling distribution of the sample mean. - The population mean is given as 180, so the mean of the distribution of sample means is 180 as well. - The population variance is 169, so the populati......Login to view full explanation

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Question at position 18 Imagine that we draw samples from the same population of normally distributed scores with a mean of 100 (μ= 100) and SD of 10 (σ = 10). First, we create a histogram for the distribution of sample means (DOSM) for a sample size of 30 (n=30). Next, we create a second distribution of sample means for a sample size of 300 (n=300). Please check the true statements below (you may check more than one).Both DOSMs will have a relatively normal distribution.The DOSM for a sample size of n=30 will have a higher mean than the DOSM for a sample size of n=300.Neither DOSMs will have a normal distribution.The DOSM for a sample size of n=30 will have a larger standard error than the DOSM for a sample size of n=300.Both DOSMs will have a standard error of 10.Both DOSMs will have a mean of 100.

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