IQ scores: Scores on an IQ test are normally distributed. A sample of 17 IQ scores had standard deviation s=8.(a) Construct an 80% confidence interval for the population standard deviation o. Round the answers to at least two decimal places.(b) The developer of the test claims that the population standard deviation is o=3. Does this confidence interval contradict thisclaim? Explain.Part: 0/ 2Part 1 of 2thot57 AAn 80% confidence interval for the population standard deviation is

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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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Chapter 8 Confidence Intervals (Mean) Progress saved Done Score: 0/14 0/14 answered Question 4 Assume that a sample is used to estimate a population mean l. Find the 80% confidence interval for a sample of size 37 with a mean of 34.5 and a standard deviation of 14.6. Enter your answer as an open- interval (i.e., parentheses) accurate to 3 decimal places. 80% C.I. D Answer should be obtained without any preliminary rounding. Question Help: Message instructor Submit Question ishelf arch Rain..^EO
A basketball player has a 60% foul-shooting percentage. Let Y denote the shot on which she makes her first free throw. Write down a general formula for the pdf.
Overweight Men For a random sample of 55 overweight men, the mean of the number of pounds that they were overweight was 31. The standard deviation of the population is 3.9 pounds. Use a graphing calculator and round the final answers to one decimal place. Part 1 of 4 The best point estimate of the mean is 31 pounds. Part: 1 / 4 Part 2 of 4 Find the 90% confidence interval of the mean of these pounds. <μ< X
If a school district takes a random sample of 55 Math SAT scores and finds that the average is 422, and knowing that the population standard deviation of Math SAT scores is intended to be 100. Find a 99% confidence interval for the mean math SAT score for this district. ______ ≤ μ ≤ _______
If n=15n=15, ¯xx¯=43, and s=20s=20, construct a confidence interval at a 90% confidence level. Give your answers to one decimal place. _____< μ < _____ Technology
Standardized tests: In a particular year, the mean score on the ACT test was 22.3 and the standard deviation was 5.3. The mean score on the SAT mathematics test was 504 and the standard deviation was 100. The distributions of both scores were approximately bell-shaped. Round the answers to at least two decimal places. Find the z-score for an ACT score of 30.
Ages of students: A simple random sample of 70 U.S. college students had a mean age of 21.53 years. Assume the population standard deviation is o - 3.82 years. Construct an 80% confidence interval for the mean age of U.S. college students. Round the answers to two decimal places. An 80% confidence interval for the mean age of U.S. college students is
For a random sample of 55 overweight men, the mean of the number of pounds that they were overweight was 28. The standard deviation of the population is 4.5 pounds.Find the 95% confidence interval of the mean of these pounds. Round intermediate answers to at least three decimal places. Round your final answers to one decimal place. ___ <u<____
-A -B Choose one (Would/Would not) and Is/Is not)
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ch.8 confidence interval mean A researcher is interested in finding a 98% confidence interval for the mean number minutes students are concentrating on their professor during a one hour statistics lecture. The study included 144 students who averaged 37.5 minutes concentrating on their professor during the hour lecture. The standard deviation was 11.3 minutes. b. With 98% confidence the population mean minutes of concentration is between (round to 3 decimal places) _____ and _____ minutes. c. If many groups of 144 randomly selected members are studied, then a different confidence interval would be produced from each group. About _____ percent of these confidence intervals will contain the true population mean minutes of concentration and about _______ percent will not contain the true population mean minutes of concentration.

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