Maintaining an acceptable success rate
There is a machine that produces 95 items per minute. Some of these items are not up to quality specifications and have to be thrown out. At this rate, how many mistakes can be made while maintaining an acceptable success rate?
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A study was conducted to determine if there was a relationship between the prices a non-member of a book club paid for various publications and the prices that a member paid for the same publications. The data gathered is shown below. Compute the
This semester a sample of 45 students revealed an average cost of books of $370 per student. The Dean of Students believes that the costs are greater this semester. What is the test value for this hypothesis?
The average weight of males in the freshman class of a certain college is 75.4kg, with a standard deviation of 7.6kg. Assume normal population. Interpret your result in each question.
The researcher now is wondering if men who themselves have just become new fathers will score higher on the scale than men in general. She samples a group of 100 new fathers and finds that their mean is 64.5. What is the mean of the comparison dis
A researcher calculates the expected value for the number of girls in three births. He gets a result of 1.5. He then rounds the result to 2, saying that it is not possible to get 1.5 girls when three babies are born. Is this reasoning correct? Exp
The Associated Press (October 9, 2002) reported that in a survey of 4722 American youngsters aged 6 to 19, 15% were seriously overweight. Calculate and interpret a confidence interval using a 99% confience level for the proportion of all american
A sample of 35 quarterbacks averaged 38 passing attempts per game. If the standard deviation is 4.7, what is 95% confidence interval for the population mean?
Office personnel randomly sampled a portion of their attendance records to determine if this claim was accurate. For the previous year, the following data was obtained from the sample group, regarding absences for that year: 4, 4, 3, 2, 6, 8, 7, 1
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