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The lifetime of a mechanical assembly in a vibration test is exponentially distributed with a mean of 400 hours.
a) What is the probability that an assembly on test fails in less than 100 hours?
b) What is the probability that an assembly operates for more than 500 hours before failure?
c) If an assembly has been on test for 400 hours without a failure, what is the probability of a failure in the next 100 hours?
For the following scores, find the (a) mean, (b) median, (c) sum of squared deviations, (d) variance, and (e) standard deviation:
Compute the 95% confidence interval on the population mean if a sample of 1000 is taken and the sample mean is found to be 15.95 and standard deviation is 4.2.
What is the probability that 30% or fewer male employees will indicate that they have to pick up the slack for mom's working flextime ?
You are interested in evaluating a new treatment for heart disease. (a) Discribe the population of interest. (b) Describe how you might obtain a random sample.
What is the probability that exactly 7 cabinets are defective? What is the probability that there are more than 8 defective file cabinets?
We are certain the the average difference in reaction times between the two light types for all golfers is between 0.27 and 7.13.
Compute the 95% confidence interval for the proportion of adults who are planning to buy a new car in the next 6 months.
What is an index number as relates to time series analysis? In a regression of a time series that states data as a function of calendar year, what requirement of regression is violated?
Calculate the mean number and median number of apples in a bag.
Calculate a 95 percent confidence interval for the mean percentage share of billing volume from network television for the population of all US advertising agencies.
Minutes of activity for lean people gad N(526, 107). Withink what limits do active minutes for about 95% of people in each group fall? Use the 68-95-99.7 rule.
The Survey of Study Habits and Attitudes (SSHA) is a psychological test that measures the motivation, attitude, and study habits of college students.
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