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The annual precipitation amounts in a certain mountain range are normally distributed with a mean of 88 inches, and a standard deviation of 10 inches. What is the likelihood that the mean annual precipitation during 25 randomly picked years will be less than 90.8 inches?
Test the teachers hypothesis that there is a significant difference between the pre and post tests.
What is the shape mean and standard deviation of the resulting distribution of the sample mean? What is the probability that the mean of the sample of 42 is more than 52 hours?
In terms of the standard scores for both sections, the score of which section was better? What are the z-scores for both sections?
What if the assumption E[u/x]=0 is not satisfied? Illustrate using an example. Explain the relationship represented by a population regression function.
Do the sample data present sufficient evidence to reject the manufacture's claim? Test using a a=0.05. What is the p-value of the test.
Explain whether the symmetry definition of probability is appropriate with respect to the outcomes in the sample space.
For population with mean of µ=60 and a standard deviation of s=24. Determine the z score corresponding to each of following samples.
Finding the value of test statistic utilizing two-tail 't' test also interpret the result. The Commercial Bank as well as Trust Company is studying the use of its automatic teller machines.
Find the probability that their mean energy consumption level for September is greater than 1075 kWh.
A salesperson makes four calls per day. A sample of 100 days gives the following frequencies of sales volumes.
Estimate a test statistic for null hypothesis H0: μ = 30 against two-sided alternative hypothesis H1 : μ ≠ 30, and by plotting this on its reference distribution.
An independent financial advisor claims an average rate of return, μ, on a particular investment is at least 7%. In testing her claim, the correct pair of hypotheses is:
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