If an estimator is unbiased, then:the mean of the estimator is equal tothe true valuethe mean of the estimator is usuallyclose to the true valuethe estimator is equal to the truevaluethe estimator is usually close to thetrue value

Solution: Unbiased estimator : An estimator T is said to be unbiased estimator of a unknown…

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A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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The scatterplot illustrates the relationship between two quantitative variables: the number of seeds planted per square foot and the yield of the crop (in pounds per square foot). Which of the following is an accurate description of the scatterplot? The more seeds that are planted per square foot, the smaller the expected yield of the crop. The more seeds that are planted per square foot, the larger the expected yield of the crop. The expected yield of a crop is high whenever the number of seeds planted per square foot is small or large. A larger yield is expected when the number of seeds per square foot is around 60. The expected yield of a crop is low whenever the number of seeds planted per square foot is small or large. A larger yield is expected when the number of seeds per square foot is around 60.
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Suppose you own shares of a company's stock, the price of which has risen so that, over the past ten trading days, its mean selling price is $14.89. Over the years, the mean price of the stock has been $10.43 (σX= $5.60.) You wonder if the mean selling price over the next ten days can be expected to go higher. Should you wait to sell, or should you sell now?
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define the parameter and write the null and alternative hypotheses in the past, the mean score of the seniors at South High on the American College Testing (ACT) college entrance examination has been 20. This year a special preparation course is offered, and all 43 seniors planning to take the ACT test enroll in the course. The mean of their 43 ACT scores is 21.1. points. The principal believes that the new course improves ACT scores and requests funding for the program. You're hired to assess the efficacy of the prep course. Is the out come of the sample mean of 21.1, good evidence that the prep course improved the seniors' ACT test scores?
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Teacher claims that the mean time required to complete a Test is two hours. A sample of 10 students took 1.7, 1.5, 2.6, 2.2, 2.4 2.3, 2.6, 3.0, 1.4 and 2.3 hours to complete the test. Test his claim to see if the mean time to complete the Test is different from two house. Use alpha = 0.05. Find p-value. State your hypothesis and your conclusion.

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If an estimator is unbiased, then: the mean of the estimator is equal to the true value the mean of the estimator is usually close to the true value the estimator is equal to the true