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Question: A survey is planned to determine the mean annual family medical expenses of employees of a large company. The management of the company wishes to be 95% confident that the sample mean is correct to within $50 of the population mean annual family medical expenses. A previous study indicates that the standard deviation is approximately ±$400.
a. How large a sample size is necessary?
b. If management wants to be correct to within ±$25, what sample size is necessary?
The Graduate Management Admission Council, who administers the test, claims that the mean total score is 529. Suppose a random sample of 8 students took the test, and their scores are given below. 699, 560, 414, 570, 521, 663, 727, 413 Use α = .05..
A sports psychologist tested whether the number of team wins in the previous season could predict the number of wins in the following season in a sample of 32.
suppose a new type of artificial heart has been developed. the heart has three moving parts that are subject to
Construct a relative frequency distribution for the weights of regular Coke by starting the first class at 0.7900 lb. and use a class width of 0.0050 lb.
As in the case of the Weibull and Gamma distributions, the lognormal distribution can be modified by the introduction of a third parameter g such that the pdf is shifted to be positive only for x . g.
System data for a job shop revealed that the average time spent by a job in the shop was approximately n = 5 working days. Construct a statistical test using a level of significance of alpha = 0.05
At the .05 level of significance, is there convincing evidence that the number of absences per employee has increased?
according to nielsen media research the average number of hours of tv viewing per household per week in the united
A manufacturer of sports drinks has randomly sampled 198 men and 202 women. Each sampled participant was asked to taste an unflavored version.
a company excavates gold and silver from 2 different mines. each hour that the company operates in mine 1 produces 2 kg
you want to compare response rates percents of two regimens. a power of 90 and a two-sided test of size 0.05 are
Formulate an alternative hypothesis for each of the following null hypotheses. (a) H0: Support for a presidential candidate is unchanged after the start of the use of TV commercials.
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