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The proportion of college football players who have had at least one concussion is estimated to be 34% in the United States. We wanted to know if football players at our university were less likely to have suffered a concussion, so we surveyed a random sample of 100 past and present football players at our university. Is this survey valid or not valid for testing the hypothesis that the proportion of college football players at our university with at least one concussion is less than the national average?
what is distribution variability and how is it linked to accuracy of statistical
Can the college conclude that the students in the new program are significantly different from the freshman class? Use a two-tailed test with an alpha level of .05?
The symphony sells raffle tickets each year to raise money. Assume they sell 2000 tickets and the tickets cost $100 each.
Compute the mode, median and mean for the college students and compute the mode, median and mean for the parents' data
question 1aa statistics practitioner wants to test the following hypothesesho p.70h1 pgt .70a random sample of 100
smith is a weld inspector at a shipyard. he knows from keeping track of good and substandard welds that for the
In previous tests, baseballs were dropped 24ft onto a concrete surface, and they bounced an average of 92.84% in. In a test of a sample of 40 new balls, the bounce had a mean of 92.67 in.
count the number of different binary sequences of length 20 that consist of a positive number of zeros followed by a
Pretests, posttests and threats to internal validity and please discuss all threats to internal validity.
a researcher conducts a study of white and black attitudes toward the police in her community.the percentage of white
What is the Z score associated with an attitude score of 27.9 and what statistical test would you use, and why - Why use a standard error rather than a standard deviation in your test?
As part of a new prevention program, a clinical psychologist wants to see whether feelings of alienation differ as a function of immigration status in a local high school.
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