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Question: The scores on an exam are normally distributed with µ = 30 and s = 7. (Show your working.)
a) What percent of the population have scores above 40?
b) What percent have scores between 30 and 40?
c) What score will place a student in the top 5% (to 1 decimal place)?
High levels of cockpit noise in an aircraft can damage the hearing of pilots who are exposed to this hazard for many hours. A Boeing 727 co-pilot collected 61 noise observations using a handheld sound meter.
Determine a 90% confidence interval on difference in mean number of production units for two shifts. Compute 99% confidence interval for part A.
Brakes for a model of automobile fail with a Poisson distribution at an annual rate of 4.4/yr. What is the probability that
The population standard deviation was 1.7 years using .95 degree of confidence what is the confidence interval for the population mean?
Students in a statistics class at a large state university were given the survey in which one question asked was age (in years); one student was a retired person, and her age was an "outlier".
How many boxes must the processor sample to be 95 percent confident that the sample mean does not differ from the population mean by more than 0.2 pounds?
In this case, we are going to study some data collected from Kelly Blue Book for several hundred 2005 used General Motors (GM) cars. This data allows one to develop regression models to determine car values based on
Find the lowest possible score a candidate can score and still qualify. Assume the scores are normally distributed.
Which test do we use to see if the difference in our sample is statistically significant? Why? Should it be one or two-tailed?
1.consider a small experiment to investigate if biofeedback can reduce blood pressure. six subjects were randomized to
Use the correct formula to find the probability that, out of 15 patients, exactly 11 are pleased with the service. Show your calculations or explain how you found the probability.
question length of pregnanciesthe length of human pregnancies from conception to birth varies according to a
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