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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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<
Solve it correctly please. I
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
There's a claim that the average tuition fee in a private university for a year in the Philippines is greater than Php.65,000 l. You want to test this claim and you randomly sample 36 private universities and finds the mean to be Php. 70,000. The population standard deviation is Php. 7500. Test the claim at 0.05 level of significance. a. What is the p-value b. What is the conclusion
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

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