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In a study investigating the effect of car speed on accident severity, 5000 reports of fatal automobile accidents were examined, and the vehicle speed at impact was recorded for each one. For these 5000 accidents, the average speed was 47 mph and that the standard deviation was 15 mph. A histogram revealed that the vehicle speed at impact distribution was approximately normal.
(a) Roughly what proportion of vehicle speeds were between 32 and 62 mph? (Round the answer to the nearest whole number.)
(b) Roughly what proportion of vehicle speeds exceeded 62 mph? (Round the answer to the nearest whole number.)
In 2001, an estimated 78% of executives believed that age bias was a serious problem. In a 2004, 82% of the executives surveyed considered age bias a serious problem.
The participants in a television quiz show are picked from a large pool of applicants with approximately 60% men and 40% women. X is a random variable that gives the number of females chosen when ten participants are picked randomly.
Find the most appropriate statistical procedure: Teacher of low-level reading group interested in average score for group of 25 students?
Suggest a target population. Who, exactly, are the "students" in question? Suggest a choice of sampling method and comment on why you have made this choice.
A researcher wants to collect data about the study habits of sophomores at Harmond University. From the sophomore class of 2,300 students, she wants to collect a sample of 70 students. Which of the following sampling methods will yield the most re..
Carry your intermediate computations to at least four decimal places. Round your answer to at least two decimal places.
i. suppose an influenza epidemic strikes a city. in 10 of families the mother has influenza in 10 of families the
Biting an unpopped kernel of popcorn hurts! As an experiment, a self-confessed connoisseur of cheap popcorn counted 773 kernels and put them in a popperAfter popping, the unpopped kernels were counted
Use a 0.01 significance level to test the claim that the selection process is biased against Americans of Mexican ancestry. Does the jury system appear to be fair?
the number of students visiting their professor during office hours each day has a poisson distribution with average
If the probability of a newborn child being female is 0.5, find the probability that in 100 births, 55 or more will be female. Use the normal distribution to approximate the binomial distribution.
What would you suggest to be the appropriate statistic tests to use and why ? Any suggestions on stating the hypothesis in a more professional manner?
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