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A machine is designed to produce ball bearings having a mean diameter of 0.574 centimeter with a standard deviation of 0.008 centimeter. To determine whether the machine is in proper working order, a sample of six ball bearings is taken every hour, and the mean diameter of each sample is recorded. (Note that each sample consists of six observations.) a. Design a decision rule using the mean diameter of the hourly samples so that you can be 95% confident that the machine is conforming to the required design standards for mean diameter of the manufactured ball bearings. b. The following table presents the mean diameter of the hourly samples for the day shift of one given day. Are there any conclusions that can be inferred from this data? Time of Sample Mean Diameter of Sample 1000 0.576 1100 - 1300 Machine down for retooling 1400 0.561
What fraction of the calls last between 4.2 and 5 minutes?
Find out the value of correlation coefficient. Make a regression model to predict winning percentage utilizing all of the data.
Assume that 89 percent of all batteries have acceptable voltages. Let Y be the number of batteries that must be tested until finding two acceptable ones. What is the probability that Y=6?
In recent year, of the 109,857 arrest fro federal offenses, 29.1% were for drug offenses. Use a .01 significance level to test the claim that the drug offense rate is equal to 30%.
The percent of persons residing in that county, by age. Use the population distribution to find the expected juror frequencies. Test the researcher's claim at α = 0.01.
Suppose that distribution is normally distributed. If worker at this fast food restaurant is chosen at random,determine the probability that worker earns more than $6.75?
78 percent of the males attended college. A management trainee is selected at random. What is the probability that the person selected is a female who did attend college?
What is the probability that a simple random sample of 40 male graduates will provide a sample mean within $10,000 of the population mean, $168,000 (to 4 decimals)?
Select the answer for each question. What type of probability distribution can be used to figure out her chance of getting 10 questions right?
Clearly identify the independent and dependent variables you would study. Determine whether an independent-samples or related-samples t test is most appropriate and why. Generate the statistical null and alternative hypotheses.
An investment counselor would like to meet with 14 of his clients on Wednesday, but he only has time for 10 appointments. How many different combinations of the clients could be considered for inclusion into his limited schedule for that day?
Calculate the expected value of your portfolio and calculate the expected standard deviation of your portfolio.
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