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1. Calculate the upper 80%.confidence interval for the population mean. (round to the nearest tenth; place your answer in the box below) 2. If we change the confidence level from 80% to 95% when constructing a Cl for the population mean, we can expect the size of the interval to(increase/decrease, place your answer right beside the confidence interval without a space and without brackets) Full credit will be given if 1 and 2 are correct. Check your spelling!

1. Calculate the upper 80%.confidence interval for the population mean. (round to the nearest tenth; place your answer in the box below) 2. If we change the confidence level from 80% to 95% when constructing a Cl for the population mean, we can expect the size of the interval to(increase/decrease, place your answer right beside the confidence interval without a space and without brackets) Full credit will be given if 1 and 2 are correct. Check your spelling!

MATLAB: An Introduction with Applications
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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F4 A random sample of 90 students at the University has a body weight of 75Kg: It is known from past history that the o2 (population variance) of the body weight is 133 Kg2 R 1. Calculate the upper 80%.confidence interval for the population mean. (round to the nearest tenth; place your answer in the box below) 2. If we change the confidence level from 80% to 95% when constructing a CI for the population mean, we can expect the size of the interval to(increase/decrease, place your answer right beside the confidence interval without a space and without brackets) Full credit will be given if 1 and 2 are correct. Check your spelling! Click Save and Submit to save and submit. Click Save All Artswers to save all answers. F5 % T G (₁) F6 A 6 Y F7 LCD/G SONY F8 & 7 7 |J F9 ** 8 (8) Q 9 5 K WEB F10 9 2 → C One Touch Web Access Without Bo F11 0 6 L 1 P Save All Answers 3 F12 * ...S Save an Num Lk Scr Lk + Enter
Transcribed Image Text:F4 A random sample of 90 students at the University has a body weight of 75Kg: It is known from past history that the o2 (population variance) of the body weight is 133 Kg2 R 1. Calculate the upper 80%.confidence interval for the population mean. (round to the nearest tenth; place your answer in the box below) 2. If we change the confidence level from 80% to 95% when constructing a CI for the population mean, we can expect the size of the interval to(increase/decrease, place your answer right beside the confidence interval without a space and without brackets) Full credit will be given if 1 and 2 are correct. Check your spelling! Click Save and Submit to save and submit. Click Save All Artswers to save all answers. F5 % T G (₁) F6 A 6 Y F7 LCD/G SONY F8 & 7 7 |J F9 ** 8 (8) Q 9 5 K WEB F10 9 2 → C One Touch Web Access Without Bo F11 0 6 L 1 P Save All Answers 3 F12 * ...S Save an Num Lk Scr Lk + Enter
Expert Solution
Step 1: Determine the given data in the question

Let mu be the population mean body weight of the student.

Given that,

No. of students left parenthesis n right parenthesis equals 90

Sample mean left parenthesis x with bar on top right parenthesis equals 75

Population standard deviation left parenthesis sigma right parenthesis equals 133

Confidence level 

left parenthesis C right parenthesis equals 80 percent sign equals 0.80 blank space O R equals 95 percent sign equals 0.95




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