Suppose that a friend of yours says that they were reading about confidence intervals and ask you the following questions:Part 1When they encountered the symbols a and mu (u) they ask "What's the difference between what these symbols represent, and what does thathave to do with confidence intervals?" (make sure you answer both parts of the question).1.Part 2When building a confidence interval, we use a point estimate and margin of error. Explain what these two terms mean, and discuss how themargin of error is related to the sample size.

Here's, x-bar and mu, first of all x-bar is the sample mean and mu is the population mean. We use…

Answered: Suppose that a friend of yours says…

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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You want to make a 90% confidence interval for a population proportion with an error term no bigger than 0.02. If you have no other information, what is the smallest sample size that guarantees this?
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HELP WITH BOTH QUESTIONS THAT GO WITH PICTURE.. Question 1: What is the confidence interval for the population mean μ? _____hg <μ<_____ hg (Round to one decimal place as needed.) Question 2: Are the results between the two confidence intervals very different? A. Yes, because the confidence interval limits are not similar. B. Yes, because one confidence interval does not contain the mean of the other confidence interval. C. No, because each confidence interval contains the mean of the other confidence interval. D. No, because the confidence interval limits are similar.
Lorraine was in a hurry when she computed a confidence interval for μ. Because σ was not known, she used a Student's t distribution. However, she accidentally used degrees of freedom n instead of n − 1. Will her confidence interval be longer or shorter than one found using the correct degrees of freedom n − 1? Explain. Longer. As the degrees of freedom increase, the value for tc increases.Shorter. As the degrees of freedom increase, the value for tc increases. Shorter. As the degrees of freedom increase, the value for tc decreases.Longer. As the degrees of freedom increase, the value for tc decreases.
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You may need to use the appropriate appendix table or technology to answer this question. At a university the historical mean of scholarship examination scores for freshman applications is 800. A historical population standard deviation ? = 150 is assumed known. Each year, the assistant dean uses a sample of applications to determine whether the mean examination score for the new freshman applications has changed. (a) State the hypotheses. (b) What is the 95% confidence interval estimate of the population mean examination score if a sample of 100 applications provided a sample mean x = 833? (c) Use the confidence interval to conduct a hypothesis test. Using ? = 0.05, what is your conclusion? (d) What is the test statistic? What is the p-value?
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