100% Correct solutions

Why is a 99% confidence interval wider than a 95% confidence interval?12. A person claims to be able to predict the outcome of flipping a coin. This person is correct 16/25 times. Compute the 95% confidence interval on the proportion of times this person can predict coin flips correctly. WhatConclusion can you draw about this test of his ability to predict the future?15. You take a sample of 22 from a population of test scores, and the mean of your sample is 60. (a) You know the standard deviation of the population is 10. What is the 99% confidence interval on the population mean. (b) Now assume that you do not know the population standard deviation, but the standard deviation in your sample is 10. What is the 99% confidence interval on the mean now?18. You were interested in how long the average psychology major at your college studies per night, so you asked 10 psychology majors to tell you the amount they study. They told you the following times: 2, 1.5, 3, 2, 3.5, 1, 0.5, 3, 2, 4. (a) Find the 95% confidence interval on the population mean. (b) Find the 90% confidence interval on the population mean.100. What is meant by the term “90% confident” when constructing a confidence interval for a mean?a. If we took repeated samples, approximately 90% of the samples would produce the same confidence interval.b. If we took repeated samples, approximately 90% of the confidence intervals calculated from those samples would contain the sample mean.c. If we took repeated samples, approximately 90% of the confidence intervals calculated from those samples would contain the true value of the population mean.d. If we took repeated samples, the sample mean would equal the population mean in approximately 90% of the samples.106. Suppose that a committee is studying whether or not there is waste of time in our judicial system. It is interested in the mean amount of time individuals waste at the courthouse waiting to be called for jury duty. The committee randomly surveyed 81 people who recently served as jurors. The sample mean wait time was eight hours with a sample standard deviation of four hours.a.i. x ¯ = __________ii. sx = __________iii. n = __________iv. n – 1 = __________b. Define the random variables X and X ¯ in words.c. Which distribution should you use for this problem? Explain your choice.d. Construct a 95% confidence interval for the population mean time wasted.i. State the confidence interval.ii. Sketch the graph.iii. Calculate the error bound.112. In a recent sample of 84 used car sales costs, the sample mean was $6,425 with a standard deviation of $3,156. Assume the underlying distribution is approximately normal.a. Which distribution should you use for this problem? Explain your choice.b. Define the random variable X ¯ in words.c. Construct a 95% confidence interval for the population mean cost of a used car.i. State the confidence interval.ii. Sketch the graph.iii. Calculate the error bound.d. Explain what a “95% confidence interval” means for this study.Use the following information to answer the next two exercises: A quality control specialist for a restaurant chain takes a random sample of size 12 to check the amount of soda served in the 16 oz. serving size. The sample mean is 13.30 with a sample standard deviation of 1.55. Assume the underlying population is normally distributed.116. What is the error bound?a. 0.87b. 1.98c. 0.99d. 1.74120. An article regarding interracial dating and marriage recently appeared in the Washington Post. Of the 1,709 randomly selected adults, 315 identified themselves as Latinos, 323 identified themselves as blacks, 254 identified themselves as Asians, and 779 identified themselves as whites. In this survey, 86% of blacks said that they would welcome a white person into their families. Among Asians, 77% would welcome a white person into their families, 71% would welcoHealth Information Systems,Information Systems,,

Get a Unique Answer HERE or Order a Similar Paper

Our website has a team of professional writers who can help you write any of your homework. They will write your papers from scratch. We also have a team of editors just to make sure all papers are of HIGH QUALITY & PLAGIARISM FREE. To make an Order you only need to click Ask A Question and we will direct you to our Order Page at WriteDemy. Then fill Our Order Form with all your assignment instructions. Select your deadline and pay for your paper. You will get it few hours before your set deadline.