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A researcher would like to know whether there is a consistent, predictable relationship between verbal skills and math skills for high school students. A sample of 200 students is obtained and each student is given a standardized English test and a standardized math test. Based on the test results, students are classified as high or low for verbal skills and for math skills. Out of the 100 students with high math skills, 64 had high verbal skills. Out of the 100 students with low math skills, 30 had high verbal skills. Based on the test results, can the researcher conclude that there is a significant relationship between verbal skills and math skills? Test at the .05 level of significance.
Estimate the true proportion of college students who believe in the possibilty of haunted places with 99% confidence.
In a sample of 60 mice, a biologist found that 46% were able to run a maze in 30 seconds or less. Find the 99% limit for the population proportion of mice who can run that maze in 30 seconds or less?
Construct a 95% confidence interval for the proportion of votes that Jefferson will receive, and make a conclusion about Jefferson winning election.
If the opinion poll had announced the margin of error for 80% confidence rather than 95% confidence, this margin of error would be?
Set up the following null and alternative hypotheses for both factors and their interaction. You should have three verbal statements, not symbolized statements.
a brewerys filling machine is adjusted to fill bottles with a mean of 31.2 oz. of ale and a variance of 0.003.
Suppose you study a random sample of 100 GRE verbal exams. Determine the probability that the average (mean) score in this sample will be between 485 and 515.
A sample standard deviation = 5.60 hours, find the upper limit of a 98% confidence interval estimate of the true population mean life.
The ancient Greeks thought that the most pleasing shape for a rectangle was one for which the ratio of the length to the width was 8 to 5, the golden ration.
The case information stated that 66% of teenagers purchase products that reflect their style and image as being hip and trendy. How would you test the appropriateness and validity of that percentage? In a test where 900 teens are randomly selected ac..
Five persons donate blood at the clinic on a particular day. Find the probability that at least one of the five does not have Rh+ blood.
A psychologist is investigating the hypothesis that children who grow up as the only child in the household develop different personality characteristics than those who grow up in larger families.
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