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A sample of 235 students found that 18% had a GPA greater than 2.89. The population from which the sample was drawn is approximately normally distributed. Construct the 95% confidence interval for the population proportion.
Most individuals are aware of the fact that the average annual repair cost for an automobile depends on the age of the automobile. A researcher is interested in finding out whether the variance of the annual repair costs also increases with the ag..
What is the probability that Bob will win that wonderful trip on the basis of his gasoline sales this month?
This sample for the proportion of the population that would favor a recount. What is the Point Estimate for the proportion of the population that would favor a recount?
ABC insurance sells term life insurance policies. If the plicy holder dies during the term of the policy ABC pays out $100000. If the person does not die ABC pays nothing and there is no further value to the policy.
200 students took a test. The scores were normally distributed. Your score was in the 60th percentile. How many people scored at or below your score?
Suppose these data represent whole population. Determine the population mean and population standard deviation.
Can the researcher conclude that humidity has a significant effect on eating behavior? Use a two-tail test with α = .05.
The estimate of the population proportion is to be within plus or minus .10, with a 99 percent level of confidence. The best estimate of the population proportion is .45. How large a sample is required?
What is the likelihood that the mean annual precipitation during 25 randomly picked years will be less than 90.8 inches?
Analyze these data and summarize your findings for managers. Explain how information can be used by decision makers. Assume that sales per customer are normally distributed.
The results of a district spelling bee for both girls and boys are normally distributed. the 60 girls have a mean score of 71 with a standard deviation of 6, while the 50 boys have a mean score of 66 points with standard deviation of 5 points.
Suppose the inspector is unhappy with the previous result and would like to resample. How many rolls should be sampled to estimate the mean tensile strength within 1.5 PSI with 95% confidence?
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