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Paris Arline's wants to estimate the average number of flights pet year for its crews. A quick pilot study found the mean to be 150 flights, with a standard deviation of 14. If you must estimate the number of flights with an error of 2 flights, how many crews should you sample? Use the 90 percent confidence level.
Calculate Cohen's d measure effect size for both tests (σ = 20 and σ = 10). Explain how sample size affect outcome of hypothesis test. How does sample size affect measures of effect size?
Use this information to find the probability that an HRO officer selected from the group surveyed had problems with either employee absenteeism or employee turnover.
in a survey 600 mothers and fathers were asked about the importance of sports for boys and girls. of the parents
At the 5% level do the data provide sufficient evidence to conclude that the mean time served for fraud is less than that for firearms offenses? Identify the appropriate test and test the claim using the traditional method at the 0.05 level of sig..
the number of customers at quiet morning bakery is believed to follow a poisson distribution with a mean of 2 customers
a shipment of 20 tv tubes contains 16 good tubes and 4 defective tubes. three tubes are chosen successively and at
a researcher is testing a possible carcinogen on mice. he chooses 8 mice at random from a batch of 13 mice. unknown to
Determine the probability of selecting sample with a mean of more than $100,000 but less than $112,000.
the information on seat belt usage by gender shown below. the proportions in the following table are based on a survey
A member of Congress wants to determine her popularity in a certain part of the state. She indicates that the proportion of voters who will vote for her must be estimated within plus or minus 2 percent of the population proportion.
Does the use of cell phones lead to a higher incidence of brain cancer? People with brain cancer were matched with people who did not have brain cancer on age, gender, and living environment. Each participant in the study was asked to answer question..
a standard 6-faced die is rolled twice in an experiment. let a and b be the outcome of the 1stnbspand 2ndnbsprolls
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