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Solve the following problems. Do not use pencil. 1. a randomly selected 80 scores from the scores of students in a Math class that is normally distributed with a standard deviatiom of 10 have a sample mean of 85. a. Find the 99% confidence interval for the entire scores of the students in the Math class. b. Find the margin of error if the confidence level is 90%.

Solve the following problems. Do not use pencil. 1. a randomly selected 80 scores from the scores of students in a Math class that is normally distributed with a standard deviatiom of 10 have a sample mean of 85. a. Find the 99% confidence interval for the entire scores of the students in the Math class. b. Find the margin of error if the confidence level is 90%.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter4: Equations Of Linear Functions
Section: Chapter Questions
Problem 8SGR
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Solve the following problems. Do not use pencil. 1. a randomly selected 80 scores from the scores of students in a Math class that is normally distributed with a standard deviation of 10 have a sample mean of 85. a. Find the 99% confidence interval for the entire scores of the students in the Math class. b. Find the margin of error if the confidence level is 90%. 2. The physician of OSFI would like to know the average weight of grade 3 students. To do this, she measured the weights of 15 students and found that their average weight was 25.25 kg. The sample standard deviation is 2.75. At a confidence level of 90%, determine the confidence interval that will estimate the mean.
Transcribed Image Text:Solve the following problems. Do not use pencil. 1. a randomly selected 80 scores from the scores of students in a Math class that is normally distributed with a standard deviation of 10 have a sample mean of 85. a. Find the 99% confidence interval for the entire scores of the students in the Math class. b. Find the margin of error if the confidence level is 90%. 2. The physician of OSFI would like to know the average weight of grade 3 students. To do this, she measured the weights of 15 students and found that their average weight was 25.25 kg. The sample standard deviation is 2.75. At a confidence level of 90%, determine the confidence interval that will estimate the mean.
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