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The house of representatives has a very controversial bill that will be going to vote. To help formulate his strategy on how to get the bill passed, the chairman of the committee that has been studying the bill wishes to know if there is a division between Democrats and Republicans on the issue or if there is some other basis for the split. To estimate the proportion of Republicans in favor of the bill, how large must a sample of representatives be to estimate the percentage within 3 percentage points with 90% certainty. Assume there are 538 representatives. Use the finite population correction factor and develop your own formula for computing the answer.
Give all steps of a test of the hypothesis that the corresponding population proportions are equal.
Richard is one of test takers. Find out the number of questions he can expect to get right on test by random guessing.
Compute the mean, median, and mode. Which of these measures of central tendency do you think most accurately describes the lifestyle variable you are looking at?
Compare 2 moving averages using MSE and compute Exponential smoothing. The subsiquent data which represents demand for company ABC's products for the last 10 months.
The lengths of pins produced by a machine follow a normal distribution with mean 2.54 cm and standard derivation 0.04 cm.
Many newspapers carry a certain puzzle in which the individual must unscramble letters to form words. How many ways can the letters of YARNLE be arranged?
If there are 5 choices for a question and there is a 50% chance that the student knows the answer, what is the probability that the student knew the answer to a question he correctly answered?
Use the relative frequency approach to construct a probability distribution for the number of tests taken.
A device has a sensor connected to an alarming system. The sensor triggers with probability 0.95 if dangerous conditions exist in a given day and with probability 0.005 if conditions are normal during the day. Days with dangerous conditions occur ..
A sample of approx 25 students enrolled in the university points out that X (bar) = $315.4 and s = $43.20.
You are picking up apples from a tree in a park. You are interested in estimating the mean weight of all apples in the park. Unfortunately you have only been able to find seven apples so far. Can you use the Central Limit Theorem to aid in your es..
Formulate a suitable null and alternative hypothesis to test the students' claim that they followed their instructor's recommendation at a 5% level of significance and interpret your findings.
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