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Write the null and alternative hypotheses you would use to test each of the following situations.
a) In the 1950s only about 40% of high school graduates went on to college. Has the percentage changed?
b) 20% of cars of a certain model have needed costly transmission work after being driven between 50,000 and 100,000 miles. The manufacturer hopes that a redesign of a transmission component has solved this problem.
c) We field-test a new-flavor soft drink, planning to market it only if we are sure that over 60% of the people like the flavor.
the lifetimes in years of a certain kind of electronic component is a random variable having probability density
the moment generating function for a random variable x is given by mxt 14 3411-t tgt1. determine formulas for the
test the given claim using the traditional method of hypothesis testing. assume that the sample has been randomly
30 said that they planned to work in a rural community. Find a 95% confidence interval for the true proportion of all medical students who plan to work in a rural community.
Test whether the signals are uniformly distributed over the 24-hour period.
Create a frequency table for the total number of people that prefer each type of music:
State the hypothesis test (with the formula of test statistic) could be used to see if the show-up ratio of people booked tickets is larger than 0.7.
A sample of N=16 scores has a M=45 and SS=960. Calculate the sample standard deviation (s) and the estimated standard error (sm) for the sample mean
confidence interval for the true mean.suppose that a random sample of 25 retail merchants from all of the 5000
What proportion is that of the 400 members in town? What is the approximate probability that the actual proportion requiring aid will exceed that value?
A life insurance policy has determined that each week an average of seven claims is filed in its Nashville branch. What is the probablity that durning the next week exactly seven claims will be filed?
Explain the difference between the standard deviation of the sampling distribution of the mean and the standard error of the mean. Explain which one is more likely to be used in practice and why.
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