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We wish to compare the GPAs of male and female Eberly College of Science undergraduates. We want to see if there is a difference in the GPAs for the two groups of students. The computer output from our analysis is below: Two-Sample T-Test and CI: GPA, Gender Gender N Mean StDev SE Mean Female 126 3.277 0.469 0.042 Male 99 3.205 0.455 0.046 Difference = mu (Female) - mu (Male) Estimate for difference: 0.071371 95% CI for difference: (-0.051222, 0.193964) T-Test of difference = 0 (vs not =): T-Value = 1.15 P-Value = 0.252 a. What is the response variable? b. What is the explanatory variable? c. What type of data is the response variable? Measurement or categorical? d. What population value will be used in our hypotheses? Population mean or Population proportion? e. What type of samples do we have? Dependent (matched pairs) or Independent f. What type of study is this? Observational or Randomized Experiment g. What are the null and alternative hypotheses?
If he were to conduct a second study to reduce the maximum error of estimate to 6, about how many hard drives should he include in his new sample?
The test results indicate that the disease is present. What is the probability that the person actually has the disease?
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A recent poll of 700 people who work indoors found that 278 smoke. If the researchers want to be 98% confident of their results to within 3.5 percentage points, how large a sample is necessary?
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Based on a random sample of 2,500 people, the estimates of people by age group unemployed in one Northern city are found in the table. Is the study descriptive or inferential?
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What is the answer to the following unsorted data shows the number of traffic tickets given each day by Deputy Fife over the last eleven days.
in a mathematics exam the average grade was 82 and the standard deviation was 5. all students with grade between 88 to
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Many people believe that criminals who plead guilty tend to get lighter sentences than those who are convicted in trials. The accompanying table summarizes randomly selected sample data for San Francisco defendants in burglary cases. All of the su..
The dimension is supposed to be 224 mm and the variability of the manufacturing process is unknown. Is there evidence that the mean dimension is not 224 mm?
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