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The mean length of a work week for the population of workers was reported to be 39.2 hours. Suppose that we would like to take a current sample of workers to see whether the mean length of a work week has changed from the previously reported 39.2 hours.
A. State the hypotheses that will help us determine whether a change occurred in the mean length of a work week.
B. Suppose a current sample of 112 workers provided a sample mean of 38.5 hours. Use a population standard deviation = 4.8 hours. What is the p-value?
C. At a = .05 can the null hypothesis be rejected? What is your conclusion?
D. Repeat the preceding hypothesis test using the critical value approach.
The sample size n, the sample means, and the sample standard deviations for the two groups are given
A game involving a pair of dice pays you 3 with probability 17/36, costs you 2 with probability 14/36, and costs you 4 with probability 5/36. What is your probability of losing money in one play of the game?
You're asked to determine whether the workers live in the community. Your personnel department provides the following table:
In our discussions of basic probability theory the concepts of mutually exclusive events and independent events share prominent roles. Please explain these concepts and in particular address the question
Findout the percentage of trainees earns less than $900 a month utilizing normal distribution.What percentage of trainees earns less than $900 a month?
Assume that, among residents of a large Florida subdivision, the population mean age is 65 years old, the population standard deviation is 2 years, and that the age variable is distributed normally.
a. State the appropriate hypotheses for your significance test. b. Use the sample results to compute the test statistic and the p-value.
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their average cost was 340.00 with standard deviation of 80.00. Dean of students thinks that costs are greater this semester. Determine the test value for this hypothesis.
Although this critique was later discarded, how does user error affect the marketplace. When I buy my morning coffee at Starbucks, the cup warns me: "Careful, the beverage you are about to enjoy is extremely hot."
Quality control engineer has been checking output by almost continuous sampling as abnormal condition began. Determine the probability that in sample of 10 pieces.
If the airline sells 160 tickets for a flight that has only 155 seats, what is probability that a seat will be available for every person holding a reservation and planning to fly?
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