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An electrical firm manufactures light bulbs that have a lifetime that is approximately normally distributed with a mean of 8000 hours and a standard deviation of 40 hours. Test the hypothesis that = 800 hours against the alternative 800 hours if a random sample of 30 bulbs has an average life of 788 hours. Use a 0.04 level of significance.
Compute the two groups using Paired sample t-test. Compute which modification reduced the number of traffic accidents
Inspection of student data generated during pre/post treatment surveys shows that among 10 subjects, 7 had higher scores after an experimental treatment
Write introduction to SPC (STATISTICAL PROCESS CONTROL)? Describe the use of SPC tools used at D2D?
Explain how hypothesis testing may be applicable in the industry of law. Provide a specific example and set up the null and alternative hypothesis?
She wants to choose the passing grade such that the probability of passing a student who guesses on every question is less than 1/10. What score should she set as the lowest passing grade?
A manufacturer claims that the mean lifetime,M , of its light bulbs is 51 months. The standard deviation of these lifetimes is 9 months. Ninety bulbs are selected at random, and their mean lifetime is found to be 53 months.
Find the probability of a type II error, β, given that the true value of the population proportion is 0.72. The sample size is 50 and the significance level is 0.05.
The U.S. Bureau of Prisons publishes data in Statistics Report on the times served by prisoners released from federal institutions for the first time.
A parent is deciding which babysitter to use in the neighborhood. Babysitter A charges $20 per hour and a base rate of $60 per day. Babysitter B charges a base rate of $50 per day and $25 per hour.
Linear equation that relates Celsius to Fahrenheit the oC is celsius in degrees and the oF is for Fahrenheit: Your company was very impressed with your results from the recent study. They have asked that you investigate another location for them an..
Diagnosis tests of medical conditions have several results. The test result can be positive or negative, whether or not a patient has the condition.
Differentiate between a point estimate and an interval estimate for a population parameter. What is necessary for an interval estimate to be a confidence interval?
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