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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.
Does being single cause an increased risk of violent crime? Describe a potential confounding variable that illustrates why it is unreasonable to conclude that a change in marital status causes a change in crime risk.
Play 100 games of scraps and empirically determine an estimate for the probability of winning.
AT&T was running commercials in 1990 aimed at luring back customers who had switched to one of the other long-distance phone service providers. One such commercial shows a businessman trying to reach Phoenix and mistakenly getting Fiji, where a ha..
What is the 95% confidence interval estimate of the population mean cost for a prescription of Zocor?
q1. if we have a sample size of 100 and the estimate of the population proportion is 0.10 the mean of the sampling
The world's smallest mammal is the bumblebee bat. Shown to the right are weights(in grams) from a sample of those bats. Use the traditional method and significance level of .05 to test the claim that these bats come from the same population having..
What standard deviation (within 0.001 inch) minimizes the annual cost of producuign elevator rails. You do not need to try standard deviations in excess of 0.02 inches.
Make a stem plot for the men height data. Calculate the five-number summary for the women.
Is the use of soap and water or alcohol-based rubs more effective in preventing nosocomial infections? How effective are anti-depressive medications on anxiety and depression?
the average gas mileage of a certain model car is 27 miles per gallon. if the gas mileages are normally distributed
charles savings and loan is testing the hypothesis that the portion of deposit slips which are filled out incorrectly
A sample of 16 consumers is taken. The average age in the sample was 22.5 years with a standard deviation of 5 years. Construct a 95% confidence level.
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