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Find the Probability and inverse probability for the given Normal distribution.
Accrotime is a manufacturer of quartz crystal watches. Accortime researchers have shown that the watches have an average life of 28 months before certain electronic components deteriorate, causing the watch to become unreliable. The standard deviation of watch lifetimes is 5 months, and the distribution of lifetimes is normal.
a) State the random variable.
b) If Accrotime guarantees a full refund on any defective watch for 2 years after purchase, what percentage of total production will the company expect to replace?
c) If Accrotime does not want to make refunds on more than 12% of the watches it makes, how long should the guarantee period be (to the nearest month)?
Construct a 99% confidence interval for the proportion of customers favoring underground installation.
If we repeated this procedure many, many times, only 5 percent of the 95 percent confidence intervals would fail to include the mean Math SAT score of the population of all students at this college.
Compute a seasonalized or adjusted sales forecast.
Compute the incidence proportion or the risk ratio that compares group 1 to group 0, and compute the Incidence proportion or the risk ratio which compares group 2 to group 0. Then post a summary of your findings.
Strongly support, support, no opinion, do not support, strongly do not support. The number of people in each category was recorded.
Is it sensible to conclude that this set of n=16 people is not representative random sample of registered voters?
Test hypothesis that people in State A are more depressed than U.S. population. Illustrate all of your hypothesis steps. (Use alpha = .01.)
A year ago, Air Force implemented new test for finding which candidates are most probable to become successful pilots. Now they wish to see if implementing pilot predictor test was a good idea. Scores have been standardized to facilitate comparis..
A random sample of students is selected, and each one is asked to try first brand A and then brand B, or vice versa with the order determined at random.
What is the p-value associated with the sample results? What is your conclusion based on the p- value?
Public transportation and the automobile are 2 methods an employee can use to get to work each day. Samples of times recorded for each method are shown. Times are in minutes.
Determine a 95 % confidence interval for the iron concentration.
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