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The company SlimDown makes weight loss products. It has recently come out with a new skin cream that, when rubbed behind the ears, is thought to cause the user to lose weight. To test the cream, a random sample of 58 people was chosen, and the percentage weight loss over an eight week period recorded. Find the power of the test to determine if the the new cream is effective, when the mean percent weight reduction is actually 0.6%. Assume that the population standard deviation is 9% and that the significance level is α=0.06.
Using the Hypothesis Tests Two Sample file and a .05 significance level, test whether there is a difference in the mean salary for men versus women.
His sample size was 50,000. His method worked better than the Digest"s method. He predicted the correct winner, but was still off by 6 percentage points. How did he predict the Digest prediction so well?
15% of the south district students failed, and 5% of the central district students failed. Develop a probability tree showing all marginal, conditional, and joint probabilities.
In a poll to estimate presidential popularity, each person in a random sample of 1000 voters was asked to agree with one of the following statements:
A product is made up of two subsystems in parallel. Subsystem one consists of ten elements in series each with a failure rate of 1/100. The second subsystem consists of 5 elements in series each with a failure rate of 1/200. What is the overall re..
What is the coefficient of determination, and wat is its meaning?
Assuming that both patients are on time, find the expected amount of time that the 1:30 appointment spends in the doctor's office.
State the relevant null and alternative hypotheses and calculate the appropriate test statistic. (By hand or using JMP.)
If you assume returns follow a normal distribution, which investment would give a better chance of getting at least a $40 million return? Explain. (B) How could your answer to part (A) change if you knew returns followed a skewed distribution inst..
As it is a 2 × 2 table, try also two-tailed two-sample z test for π 1 = π 2 and verify that z 2 is same as your chi-square statistic. Which test do you prefer? Explain why?
Determine the minimum weight of the heaviest 5% of all items produced. If 27,875 of the items of the entire production weigh at least 5.01 ounces, how many items have been produced?
Illustrate for what value does probability XYZ will offer a competing product will ABC be indifferent among the alternatives.
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