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Question: To qualify for security officers training, recruits are tested for stress tolerance. The scores are normally distributed with a mean of 62 and a standard deviation of 8. If only the top 15% of recruits are selected, find the cut-off score. What is the percentile rank of that score?
Assume the shopping time followed an approximately normal distribution. Use a 5% level of significance to test the claim that the average shopping time foe women with children in Carson mall is higher than the national average for this type of sto..
the following probability model shows the distribution of doctoral degrees from u.s. universities in 2009 by area of
The production line that packages boxes of raisins at a snack food manufacturer will be considered operating properly if the average weight of the boxes of raisin is 3.5 ounces with a standard deviation of 0.3 ounces.
a company that manufactures video cameras produces a basic model and a deluxe model. over the past year 30 of the
A research firm conducted a survey to determine the mean amount people spend at a popular coffee shop during a week. They found the amounts spent per week followed a normal distribution with a population standard deviation of $4.
What do you notice about the two histogrum and (therefore) about the estimates of probability of getting above 0?
an average of 6 cars arrive per hour at a restaurant. assume that the number of cars arriving per hour follows poisson
Perform a paired-samples t-test for experiment (p = .01 or 99% confidence, two-tailed). Is there a significant difference between the two teaching methods?
a man and a woman agree to meet at a cafe about noon. if the man arrives at a time uniformly distributed between 1140
construct a probability distribution for a family of three children. let x represent the number of boys. assume there
question researchers asked a sample of 50 1st grade teachers and a sample of 50 12th grade teachers how much of their
Define the decision rule. Calculate the value of the test statistic.
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