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Scores of high school students on a national mathematics exam in Egypt were normally distributed with a mean of 86 and a standard deviation of 4. What is the probability that a randomly selected student will have a score of 80 or higher? If there were 97,680 students with scores higher than 91, how many students took the test?
Find the mean/standard error of the sampling distribution of the proportion. Assume that 26% of students at a university wear contact lenses. We randomly pick 300 students.
Assume the cholesterol levels of adult American women are normally distributed with a mean of 190 mg/dL and a standard deviation of 26 mg/dL. What level would represent the 10th percentile?
This test result prompts a state administrator to declare that the mean score for the sate's eighth graders on the examination is more than 275. at a=.04, is there enough evidence to support the claim.
At the .01 significance level, is there a relationship between job pressure and age?
A neuropsychologist compare the auditory abilities of blind versus normally sighted rats. He predicted that the visually impaired rats would have better auditory development than normally sighted rats.
The supplier agrees they will deliver on the day the order is placed. Note that the basic unit of measurement for a period is one year in this case.
Determine the t values that form boundaries of critical region for two-tailed test with a = .05 for each of the given df values.
The port of Trop can service only 1 ship at a time. However, there is mooring space for 3 more ships. Trop is a favorite port of call, but, if no mooring space is available the ships have to go to the next port.
Construct and interpret a 90% confidence interval to estimate the mean fuel savings in the population of all such vehicles.
Describe meaning of alternatives, criteria and states of nature. Explain how are they utilized in decision analysis?
Using an appropriate statistical test determine if there is a significant association between gender and satisfaction with the new initiative.
A random sample of 15 observations from the first population revealed a sample mean of 350 and a sample standard deviation of 12.
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