Sampling distributions of the proportion of students
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?
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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
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
The PG County conducts annual surveys with twenty-five randomly assigned members of the community to evaluate their perception of safety. If the person claims that the criminal activity has not changed when compared with last year his answer recei
In January 2006, the Web site for M&M TM candies claimed that 24% of plain M&M candies are blue, 20% are orange, 16% green, 14% yellow, and 13% each red and brown. You select one M&M candy at random from a package. Describe the sample
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