Question 9Given a sample of size 25 and an unknown standard deviation, which of the following values should be used as the first part of the margin of error when computing a 95% confidence interval estimate for the population mean?A 1.04582064CIM0.1711

Answered: Image /qna-images/answer/4ae5db19-d255-4327-946f-bfedc885a8e4.jpg

Answered: Question 9 Given a sample of size 25…

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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QUESTION 22 The waiting time (in minutes) of customers at a fast food outlet is normally distributed. A random sample of 15 customers is selected and the 99% confidence interval for the population mean waiting time is obtained as (1.83,2.16). Find the standard deviation used to construct the 99% confidence interval. Round your answer to three decimal places.
QUESTION 30 The waiting time (in minutes) of customers at a fast food outlet is normally distributed. A random sample of 16 customers is selected and the 99% confidence interval for the population mean waiting time is obtained as (1.95,2.64). Find the standard deviation used to construct the 99% confidence interval. Round your answer to two decimal places.
QUESTION 30 Find the confidence level related to the critical value to/2= -1.81 where the sample size n =9. 91.2% 089.2% 90.3% 89.8%
QUESTION 7 The daily electrical energy consumption (in Watts) during July for a random sample of 16 households was recorded. The mean was 3307 W and the standard deviation was 327 W. Assume the underlying distribution of the consumption is normal. Find the lower confidence limit (LCL) of the 95% confidence interval for the mean daily electrical energy consumption during that month. Round your answer to the nearest whole number (integer).
Question 1 There are hundreds of apples on the trees, so you randomly choose just 44 apples and get a mean weight of 85.12 grams with a standard deviation of 6.86 grams. Assuming that the weight of the apples is normally distributed, what is the standard error of the 90% confidence interval for the mean weight of the apples. Note: Round your answers to 4 decimal places.
QUESTION 1 (a) The concentration of chlorine in swimming pool is vary with a standard deviation of 14.1 ppm (part per milllion) for swimming pool A and 9.5 ppm for swimming pool B. Random samples of 75 chlorine readings in swimming pool A and 50 chlorine readings in swimming pool B yield means of 28 and 33 ppm, respectively. i. Construct a 97.5% confidence interval of the difference in true means concentration of chlorine between these two swimming pool. ii. A chemist wants to check whether the true means concentration of chlorine are same for swimming pool A and B. At 7% significance level, could you assist the chemist?
QUESTION 25 The daily sales of Hi-White toothpaste are believed to be approximately normally distributed. For a random sample of 21 days, the standard deviation sales turned out to be 18.19 tubes. Find the crtical value that corresponds to the confidence interval if the margin of error is 7.79. Round your answer to three decimal places.
Question 2 There are hundreds of apples on the trees, so you randomly choose just 63 apples and get a mean weight of 88.08 grams with a standard deviation of 5.11 grams. Assuming that the weight of the apples is normally distributed, what is the margin of error of the 90% confidence interval for the mean weight of the apples. Note: Round your answers to 4 decimal places.
QUESTION 3 A consumer organization wants to estimate the life of their Extra-Brite light bulbs. With 42 randomly purchased bulbs, they find the mean life to be 998 hours with a standard deviation of 33 hours. Find the 95% confidence interval for the mean life of these bulbs. Interpret your answer. Part A - Fill out the pieces of the formula: 土 times divided by Square root of Part B- To two decimal places, the interval is ( ) Make sure this is small value first. Part C- We are confident the population is between and hours.
QUESTION 10 The daily electrical energy consumption (in Watts) during July for a random sample of 11 households was recorded. The mean was 3005 W and the standard deviation was 455 W. Assume the underlying distribution of the consumption is normal. Find the marging of error E of the 95% confidence interval for the mean daily electrical energy consumption during that month. Round your answer to two decimal places.
QUESTION 9 A survey of 18 adults in UAE found that the mean age for a person's primary vehicle is 3.9 years and a standard deviation of 0.6 year. Assuming that the population is normally distributed. Find the upper confidence limit (UCL) of the 95% confidence interval for the population mean age. Round your answer to three decinal places.
QUESTION 5 A random sample of n = 144 is drawn from a population with a known standard deviation of o= 14.1. The sample mean is x= 95. What is the 90% confidence interval for the population mean? O a. (93.07, 96.93) O b.(93.49, 96.51) O c. (92.70, 97.30) O d. (92.27, 97.73)

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Question 9 Given a sample of size 25 and an unknown standard deviation, which of the following values should be used as the first part of the margin of error when computing a 95% confidence interval estimate for the population meam A 1645 82064 OCIM 6.1.711