Use the given degree of confidence and sample data to find a confidence interval forthe population standard deviation o. Assume that the population has a normaldistribution. Round the confidence interval limits to the same number of decimalplaces as the sample standard deviation.The mean replacement time for a random sample of 20 washing machines is 10.9years and the standard deviation is 2.7 years. Construct a 99% confidence interval forthe standard deviation, o, of the replacement times of all washing machines of thistype.O 1.9 yr < o < 4.5 yrO 2.4 yr < a < 5.7 yrO 2.6 yr < o < 3.3 yrO 3.8 yr < o < 5.1 yrO 4.8 yr < o < 6.1 yr

Given,sample size(n)=20sample mean(x¯)=10.9standard deviation(s)=2.7degrees of…

Answered: Use the given degree of confidence and…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Use the given degree of confidence and sample data to construct a confidence interval for the population mean μ.Assume that the population has a normal distribution. Thirty randomly selected students took the calculus final. If the sample mean was 75 and the standard deviation was 13.21 construct a 99% confidence interval for the mean score of all students. Round to two decimal places.
A sample of 20 items provides a sample standard deviation of 4.
A simple random sample of size n=18 is drawn from a population that is normally distributed. The sample mean is found to be x=50 and the sample standard deviation is found to be s=12. Construct a 95% confidence interval about the population mean. The lower bound is nothing. The upper bound is nothing.
A biologist measures the lengths of a random sample 30 mature brown trout in a large lake and finds that the sample a mean weight of 43 pounds. Assume the population standard deviation is 3.3 pounds. Based on this, construct a 90% confidence interval for the mean weight of all mature brown trout in the lake. Round your anwers to two decimal places. ______< μ <_______
The waiting times (in minutes) of a random sample of 21 people at a bank have a sample standard deviation of 3.3 minutes. Construct a confidence interval for the population variance σ2 and the population standard deviation σ. Use a 90% level of confidence. Assume the sample is from a normally distributed population.
The distribution of study times for first year students follows a Normal distribution with standard deviation σ = 78 minutes. Suppose a sample of 452 students found that the mean study time for these students was x¯= 192 minutes per week. Use this to find a 95% confidence interval to estimate the mean study time for all students. We are 95% confident that the mean study time for first year students is between _____minutes and _____ minutes
A statistics class is estimating the mean height of all female students at their college. They collect a random sample of 42 female students and measure their heights. The mean of the sample is 65.3 inches and the sample standard deviation is 5.4 inches. Find the 90% confidence interval for the mean height of all female students in their school? Assume that the distribution of individual female heights at this school is approximately normal. 1. The t value is 1.3025 2. The standard error has a value of -- 3. The margin of error has a value of 4. Find the 90% confidence interval for the mean height of all female students in their school
The distribution of study times for first year students follows a Normal distribution with standard deviation σσ = 54 minutes. Suppose a sample of 487 students found that the mean study time for these students was x¯x¯= 173 minutes per week. Use this to find a 88.28% confidence interval to estimate the mean study time for all students. We are 88.28% confident that the mean study time for first year students is between minutes_____ and ____ minutes. What is the margin of error for your confidence interval?
Assume that a sample is used to estimate a population mean. Find the 90% confidence interval for a smaple of size 46 with a mean of 68.5 and a standard deviation of 6.6. Enter the answer as an open-interval (parentheses) accurate to one decimal place (because the sample statistics are reported accurate to one decimal place).
Use technology to construct the confidence intervals for the population variance o and the population standard deviation o. Assume the sample is taken from a normally distributed population. c= 0.90, s = 5.76, n = 26 The confidence interval for the population variance is ( ). (Round to two decimal places as needed.) The confidence interval for the population standard deviation is ( ). (Round to two decimal places as needed.)
Assume that a sample is used to estimate a population mean u. Find the 99% confidence interval for a sample of size 42 with a mean of 68,6 and a standard deviation of 21.9. Enter your answer as an open- interval (i.e., parentheses) accurate to 3 decimal places. 99% C.I. = The answer should be obtained without any preliminary rounding.
esc A chain of restaurants has historically had a mean wait time of 9 minutes for its customers. Recently, the restaurant added several very popular dishes back to their menu. Due to this, the manager suspects the wait time, μ, has increased. He takes a random sample of 44 customers. The mean wait time for the sample is 9.6 minutes. Assume the population standard deviation for the wait times is known to be 3.3 minutes. Can the manager conclude that the mean wait time is now greater than 9 minutes? Perform a hypothesis test, using the 0.05 level of significance. (a) State the null hypothesis Ho and the alternative hypothesis H₁. Ho: D H₁: 0 (b) Perform a Z-test and find the p-value. Here is some information to help you with your Z-test. • The value of the test statistic is given by Standard Normal Distribution Step 1: Select one-tailed or two-tailed.. O One-tailed O Two-tailed Explanation H Check OO MacBook Pro Español ? CÙ D 19 As Ⓒ2022 McGraw Hill LLC. All Rights Reserved. Terms of…

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