Which of the following is the best way to reduce the variances in the distributions of means when conducting a t test for independent means?
A) Increase the size of the samples
B) Raise the study's level of significance
C) Use the true population variance
D) Treat the two samples as one sample
A
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According to the text, women and men don't always experience middle age in a similar manner
a. true b. false
Harry Braverman's thesis on the deskilling of many jobs refers to the idea that mechanization has reduced the skill levels necessary for many jobs, so that many workers are too highly educated for jobs they have or are likely to have for the rest
of their lives. Indicate whether the statement is true or false
When follow-ups are planned with mail surveys,
a. the anonymity of respondents can no longer be guaranteed. b. more thoughtful answers are usually provided by those who wait until the follow-up to respond. c. response rates typically increase. d. response bias can no longer be estimated. e. costs are rarely manageable for the researcher.
About 20.4 million Americans are considered _____ because they are living at or below half of the poverty line
a. lower-middle class b. near poor c. severely poor d. lower-lower class