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Question: The Glen Valley Steel Company manufactures steel bars. If the production process is workingproperly, it turns out steel bars that are normally distributedwith mean length of at least 2.8 feet. Longer steel barscan be used or altered, but shorter bars must be scrapped.You select a sample of 25 bars, and the mean length is 2.73feet and the sample standard deviation is 0.20 foot. Do youneed to adjust the production equipment?
a. If you test the null hypothesis at the 0.05 level of significance, what decision do you make using the critical value approach to hypothesis testing?
b. If you test the null hypothesis at the 0.05 level of significance, what decision do you make using the p-value approach to hypothesis testing?
c. Interpret the meaning of the p-value in this problem.
d. Compare your conclusions in (a) and (b).
Digital Switches, Inc., produces a product called the C3PO with an advertised 0.5% failure rate. Calculate the range within which the population average failure rate can be found with 95% confidence.
For the grand opening, an arena has selected 5 finalists, each of whom will win a season ticket located in one of 5 sections: The upper balcony, lower balcony, main floor, courtside, or a luxury box.
Standard deviation of 424 and 155 respectively. at the .05 level of significance, test the claim that the new version has standard deviation equal to that of the past version.
For a sample with standard deviation of 10, a score of X = 44 corresponds to z-score of 0.50. Based on this info, determine the sample mean?
Night games and 90 percent of their day games. According to today's newspaper, they won yesterday. What is the probability the game was played at night?
What is the relationship between the amount spent per week on food and the size of the family? Do larger families spend more on food?
Pprobability is no greater than 1% that the day's supply is exhausted. How many pounds of ground beef should the manager have available for use each day?
Major hurricane will strike the U.S. mainland, b) at most one major hurricane will strike the U.S. mainland, and c) more than one major hurricane will strike the U.S. mainland.
Solve each compound inequality. State the solution set using interval notation and graph it.
What are the minimum and the maximum starting salaries of the middle 95% of the LU graduates?
A sample of 12 homes sold last week in St Paul, Minnesota, is selected. The results are shown below and create a scatterplot. Insert the trendline into the graph and show the regression equation.
Calculate a 99% confidence interval for the true mean difference between pretreatment and after treatment testosterone levels of young male TBI patients.
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