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5% of people in united states eligible to donate blood actually do. you randomly select 4 eligible blood donars and ask them if they donate blood. find the mean, variance and standard deviation of binomial distribution? what valuses of the random variable X would you consider unusual?
The following table gives the coal usage and electricity generated by ten randomly selected power stations in South Africa in 1992:
There are three flight phases. At α = 0.05, is the cockpit noise level independent of flight phase?
At α = 0.10 test the claim that there is a difference in means of the salaries. (a) State the Hypotheses: (b) Compute the Test statistic: (Round off correctly)
What can you say about the effect of sample size on confidence intervals?
Ace Machine Works estimates that the probability its lathe tool is properly adjusted is 0.8. When the lathe is properly adjusted, there is a 0.9 probability that the parts produced pass inspection.
After 1,000-trial simulation, examine statistical information generated and compare output of simulation with your findings in Problem .Briefly describe the significant similarities and differences.
How does your sample compare to this theoretical distribution of sample means and what are the mean, variance, and standard deviation of the observations in your sample?
Describe the following correlation. The students with the highest grades in written French were also the students with the highest grade in spoken French.
Hypothesis test for the difference between two means - To make the data comparable, certain features, such as the deductible amount and limits of liability, are standardized.
A banks loan officer rates applicants for credit. The ratings are causally distributed with a mean of 200 also a standard deflation of 50.
Four students each received a raw score of 22 on a different test. Compute the z-score for the raw score value of 22 for each student, given information about the distributions of X values for each test.
Use this poll result to give 70%, 80%, 90% and 99% confidence intervals for the proportion of all adults who feel this way. What do your results show about the effect of changing the confidence level? (Use Excel)
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