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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Answered: IQ scores: Scores on an IQ test are…

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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Ages of students: A simple random sample of 110 U.S. college students had a mean age of 23.05 years. Assume the population standard deviation is o =4.81 years. Construct a 90% confidence interval for the mean age of U.S. college students. Round the answers to two decimal places. A 90% confidence interval for the mean age of U.S. college students is 22.46 T< u <23.64
Question Help ▼ 7.2.7-1 Assume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) find the critical value t/2, (b) find the critical value za/2, or (c) 40- state that neither the normal distribution nor the t distribution applies. 30- The confidence level is 90%, o = 3775 thousand dollars, and the histogram of 64 player salaries (in thousands of dollars) of football players on a team is as shown. 20- 10- 0- 4000 8000 1200 16000 2000 Salary (thousands of dollars) Select the correct choice below and, if necessary, fill in the answer box to complete your choice. OA. ta/2= (Round to two decimal places as needed.) O B. Za/2= (Round to two decimal places as needed.) OC. Neither the normal distribution nor the t distribution applies.
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
PARTS A and B
Drill lifetime: A sample of 50 drills had a mean lifetime of 12.07 holes drilled when drilling a low-carbon steel. Assume the population standard deviation is 6.26. Part: 0/3 Part 1 of 3 (a) Construct a 95% confidence interval for the mean lifetime of this type of drill. Use tables or technology. Round your answers to at least two decimal places. D. X The confidence interval is S
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
IQ scores: Scores on an IQ test are normally distributed. A sample of 20 1Q scores had standard deviation s=10. (a) Construct a 99% confidence interval for the population standard deviation o. Round the answ s to at least two decimal places. (b) The developer of the test claims that the population standard deviation is o=13. Does this confidence interval contradict this claim? Explain. Part: 0/ 2 Part 1 of 2 A 99% confidence interval for the population standard deviation is
Online courses: A sample of 268 students who were taking online courses were asked to describe their overall impression of online learning on a scale of 1- 7, with 7 representing the most favorable impression. The average score was 5.73, and the standard deviation was 0.97. Part: 0 / 2 Part 1 of 2 (a) Construct a 95% confidence interval for the mean score. Round the answers to two decimal places. A 95% confidence interval for the mean score is <μ<
Scores on an English test from 30 students in Class One has a mean of 33 and a standard deviation of 7.2. Scores on an English test from 40 students in Class Two has a mean of 39 and a standard deviation of 5.5. Assuming the two classes are independent, construct a 90%confidence interval for difference between the mean scores for Class One and Class Two. Round your answer to 3 decimal places. Base on the confidence interval, what conclusion can you draw? Group of answer choices (-8.530,-3.470) Group 2 is bigger (-8.530,-3.470) Group 1 is bigger (-8.639,-3.361) No conclusion (-8.639,-3.361) Group 2 is bigger (-6.769,-5.231) Group 2 is bigger

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