The standard deviation of the population of individual scores is 15. A
random sample of 40 subjects yields a mean of 105.
a. Calculate the standard error of the mean.
b. Test the hypothesis, via the z test, that this sample could be
representative of a population whose mean is known to be 100.
a SEm=2.37
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Suppose that a researcher conducted a survey about sexual attitudes in 1970 that asked if people approved of premarital sex and of same-sex orientation
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