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Toastmasters International cites a February 2001 reported by Gallop Poll that 40% of Americans fear public speaking. A student believes that less than 40% of students at her school fear public speaking. She randomly surveys 426 schoolmates and finds that 150 report they fear public speaking. Conduct a hypothesis test at the 5% level of significance to determine if the percent at her school is less than 40%
Show the hypothesis, calculated z or t score, and decision to accept or not accept the null hypothesis
suppose that the amount of time between consecutive surges in an electricity network has an exponential distribution
Given a mean score of 70, standard deviation of 15,percentile of 23.Find the Z score,T score and raw score.
a. Compute the mean quoted airfare. b. Compute the variance and standard deviation in airfares quoted. Treat the data as a sample.
The mileage per day is distributed normally. Find the probablitly that a truck drives at least 133 miles in a day. Round your answer to 4 decimal places.
lily estimates that her time to fall asleep each night is approximately exponentially distributed. it takes her an
using the data shown below suppose we focus on the proportions of patients who show improvement. is there a
plot the following set on a scatter plot. estimate the correlation and them compute it. next identify any outliners in
questionabc company produces a line of internal winchester disks for pcs. the drives uses a 3.5 inch platter from an
many elementary schools have implemented a daily sustained silent reading period during which students faculty and sta
if a white-collar worker is chosen at random from this group, what is the probability that he or she prefers light beer (to reg. beer or none at all)?
on august 82012 the national average price for a gallon of regular unleaded gasoline was 3.63. the prices for a random
Identifying H0and Hr in ex 5-12 , examine the given statement , then express the null hypothesis H0 and alternative hypothesis H1 in symbolic form.
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