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A researcher drew a sample of 400 people, measured their IQs, and tested the null hypothesis that µIQ = 100. The researcher obtained z 3.00, which led her to reject the hypothesis ( was 15.0).
(a) What was the standard error of the mean?
(b) What was the mean of the sample?
(c) The test yielded a statistically significant outcome. Does it appear to be an important one? Explain. (d) How much of a standard deviation did the discrepancy between X and hyp amount to?
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The publisher of a popular financial periodical has decided to undertake a campaign in an effort to attract new subscribers.
A school has 200 seniors of whom 140 will be going to college next year. Forty will be going directly to work. The remainder are taking a gap year.
the yearly cost of dental claims for the employees of the local shoe manufacturing company is normally distributed with
What is the purpose of partial correlation?- When a path diagram is shown, what information is conveyed by the arrows leading from one variable to another?
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If the consistency of changes in the dependent variable across groups increases, then how does the power of the within-subjects design change?
A manufacturer produces a batch of memory chips (RAM) and measures the mean-time-between-failures (MTBF). The manufacturer then changes a manufacturing process and produces another batch and again measures the MTBF.
Childhood obesity is a major problem these days. Obviously our public health officials have not been doing their job.
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