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Active Trader compared earnings on stock investments when companies made strong pre-earnings announcements versus cases where pre-earnings announcements were weak. Both sample sizes were 28.
The average performance for the strong preearnings announcement group was 0.19%, and the average performance for the weak pre-earnings group was 0.72%.
The standard deviations were 5.72% and 5.10%, respectively.5 Conduct a test for equality of means using α = 0.01 and construct a 99% confidence interval for difference in means.
a manufacturing company is interested in predicting the number of defects that will be produced each hour on the
Standard deviation of 4 beats per minute. If 300 women are examined, how many would you expect to have a heart rate less than 75?
website visitors are often loath to disclose personal information when making a purchase on the internet. despite
What are the theoretical considerations of hypothesis testing and why are these considerations important when conducting research studies?
americans have become increasingly concerned about the rising cost of medicare. in 1990 the average annual medicare
A standard IQ test has mean of 98 and a standard deviation of 16. We want to be 99% certain that we are 8 IQ points of the true mean. Determine the sample size.
is there a relationship between gender and the type of car driven? a random sample of 1000 adults was obtained. the
Categorize the events as dependent or independent. Events A and B where P (A) = 0.7, P (B) = 0.8, and P (A and B) = 0.56.
Based on this data can the college conclude that the students in the new program performed better than the rest of the class> A one-tailed test is used equalling .05
At the .05 significance level, can we conclude that the guideline is still reasonable?
Problem: Monthly electric bills in a large city are normally distributed with a mean of $240 and a standard deviation of $45. What is the probability that a randomly selected electric bill has a value between $280 and $320?
Depends on the satellite information illustrate what is the expected number µ of real forest fires on the Seward Peninsula.
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