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New car manufacturer claims that miles per gallon for gas consumption is mound shaped and symmetric with a mean of 25.9 mpg with a standard deviation of 9.5 mpg. If 30 cars are tested, what is the probability the average mpg achieved by these 30 cars will be greater than 28?
Answer rounded to the nearest 4 decimal places.
The error between the sample mean and the population mean for a sample of n = 16 is 5 points and the error between a sample mean and population mean for a sample of n = 100 is 2 points. Explain the difference in the standard error for the two samp..
In multi-choice test, each question has four options. Students wil get 10 points for each correct answer; lose four points for each incorrect answer; and receive no points for unanswered questions.
You are looking at two used cars at a dealership. They are both the same year, make, model, color and price. You decide to ask the salesman which is more reliable.
A person purchases a package of 10 ball-point pens which, unknown to the purchaser, contains 4 defective pens. Of the first 2 pens used by the purchaser
Consider in you response how the concepts of a population (and its associated parameters) and the sample (and its associated estimates) fits into the discussion.
Why then does it matter whether we assume straight-line or MACRS depreciation when we assess project NPV?
The life of a calculator manufactured by Intel corporation has a normal distribution with a mean of 50 months and a standard deviation of one year.
A processor of carrots cuts the green top off each carrot, washes the carrots, and inserts six to a package. Twenty packages are inserted in a box for shipment. To test the weight ofthe boxes, a few were checked.
A stockbroker at Critical Securities reported that the mean rate of return on a sample of 10 oil stocks was 12.6 percent with a standard deviation of 3.9 percent. The mean rate of return on a sample of 8 utility stocks was 10.9 percent with a stan..
A project manager at COMSOFT corporation has collected statistics on the organization's software development process. He has the size of each project in number of lines of code for the past 20 projects and the number of lines of code in error disc..
Can we conclude that mean time for game is less than 3.50 hours? Use.05 significance level.
What additional information is obtained from measurements on an ordinal scale compared to measurements on a nominal scale?
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