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Much attention has recently focused on the incidence of concussions among athletes. Separate samples of soccer players, non-soccer athletes, and non-athletes were selected. The accompanying table then resulted from determining the number of concussions each individual reported on a medical history questionnaire ("No Evidence of Impaired Neurocognitive Performance in Collegiate Soccer Players," Amer. J. of Sports Med., 2002: 157-162).
Does the distribution of # of concussions appear to be different for the three types of individuals? Carry out a test of hypotheses.
What proportion of healthy adults have pulse rates that are at most beats/sec? Round your answer to at least four decimal places.
A statistics practitioner conducted a two-factor analysis of variance experiment with a =4, b = 3, and r = 8. The sum of squares are listed here:
six people have declared their intentions to run for trustee seat in the next local election. a political poll is
Known that 15% of walls painted with this paint need more than 55 minutes to dry completely. Find the standard deviation of this distribution.
Compute the approximate jp-value associated with the test statistic. Does the sample data support the null hypothesis at the a- 0.05 level?
Develop the 90 percent confidence interval for the population mean and explain why we need to use the t distribution. What assumption do you need to make?
in a sample of 30 elves the correlation between years of employment and cookie productivity was found to be -0.25.a
More than 1 million skin cancers are expected to be di- agnosed in the U.S. this year-almost half of all cancers diagnosed. The prevalence of skin cancer is attribut- able in part to a history of unprotected or under-pro- tected sun exposure. Sunscre..
Hypertensive experimental (n=100) is 14%, placebo (n=100) is 22%. Generate a 95% Confidence interval for difference in proportions of patients with hypertension between groups.
At a national seashore, the number of swimmers per day who require lifeguard assistance averages 4.1, on any day when 7 or more swimmers are assisted, the lifeguards receive a $20 bonus for extra effort.
if you had the chance to set up a simple experiment at your workplace to test a hypothesis would you have your research
can a test of significance show a statistically significant relationship while a measure of association shows a weak
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