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A study of 60 professors showed that the time they spent on the average in creating test questions was 13.0 minutes per question. The standard deviation of the population is 2. What is them 98% confidence interval for the average number of minutes it takes to create a test question?
(a) State the hypothesis for a right-tailed test. (b) Obtain a test statistic and p-value assuming equal variances. Interpret these results. (c) Is the difference in mean scores large enough to be important?
The number of hurricanes that are formed during each hurricane season can be modeled using the Poisson probability distribution.
a. What is the probability of a type I error? b. Give the formula for the test statistic.
A college believes that 28% of applicants to that school have parents who have remarried. How large a sample is needed to estimate the true proportion of students who have parents who have remarried to within 5 percentage points with 95% confidenc..
A sample of 50 male and 50 female infants were put on an experimental infant formula. After two weeks the parents of each infant were asked to fill out a questionnaire concerning infant satisfaction on the formula. One of the questions was "Did Ba..
The scores of the GRE exam are transformed so they have a mean of 500 and standard deviation of 100. The scores are known to be normally distributed. What is the percentage of students that score below 750?
Compute the kappa statistic and its standard error regarding reproducibility of the diagnosis of dyspnea in the clinic.
How to calculate the trimmed mean for each sample by deleting the smallest and largest observation and then corresponding trimming percent ages.
Let μ be the mean perceived age estimate for all viewers of the ad, and suppose we consider the industry requirement to be met if μ is at least 25. Set up the null and alternative hypotheses needed to attempt to show that the industry requirement ..
Suppose that an automobile manufacturer designed a radically new lightweight engine and wants to recommend the grade of gasoline to use.
Distinct random variable
The standard deviation was 2. At α = .10, is the number of years' experience of the taxi drivers really less than the taxi company claimed?
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