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

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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 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 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 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