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A professor at a loca community noted that the grades of hi s students were normally distrubuted with a mean of 74 and a standard deviation of 10.The prof has informed us that 6.3 percent of his students received A's while only 2.5 percent of his students failed the course and received F's.
a. what is the minimum score needed to make an A.
b. what is the minimum score among those who received an F.
C. If tere were 5 students who did not pass the course,how many students took the course.
An average computer mouse inspector can inspect 50 mice per hour. The 48 computer mice inspectors at a particular factory can only insppect 46 mice per hour with a standard deviation of 10.
14 machines are planned to be used for a 60-day production run for a customer. The operating time is 1660 hours. Upon failure, a machine must be returned to the manufacturer for repair.
He wants to be 95% confident that his estimate is correct. If the standard deviation is $1050, how large a sample is needed to get the desired information and to be accurate within $200?
There are 10 questions on a true-false test. A student feels unprepared for this test and randomly guesses the answer for each of these.
You are given the sample mean and the sample standard deviation. Use this information to construct the 90% and 95% confidence intervals for the population mean. Which interval is wider? If convenient, use technology to construct the confidence int..
The regression equation is Y = 29.29 - 0.96X, the sample size is 8, and the standard error of the slope is 0.22. What is the critical value to test the significance of the slope at the 0.01 significance level?
Engineers hoped to base their decision on re- actions of 50 drivers, but time and budget constraints may force them to cut back to 20. How would this influence the power of the test? Describe.
Assume you want to repeat the FDA experiment to achieve an estimation of the mean μ of the amount of caffeine content of a cup of coffee.
In 1990, 5.8% of job applicants who were tested for drugs failed the test. At the 0.01 significance level, test the claim that the failure rate is now lower if a simple random sample of 1520 current job applicants results in 58 failures. Does the ..
Write the regression equation approximately. Computed the coefficient of determination(r 2 ).
Any value which is based on having measured a sample is called:
a. How much toothpaste would you expect to be remaining?
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