Confidence interval for the population mean
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?
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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
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?
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
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
Out of 400 students in a school, 279 passed the exam. What would be the mean of the sampling distributions of the proportion of students who passed the exam in the school?
a. What decision should be made by the optimist? b. What decision should be made by the conservative?
A statistician needs to survey a sample of 50 people that is representative of voters in his community. He prepared a list of phone numbers of 50 randomly selected, expected voters. Next morning, he came to work at 8:00 and began to make calls. By
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