1. If n=18, ¯x(x-bar)=49, and s=4, find the margin of error at a 99% confidence level Give your answer to two decimal places. 2. If n=15, ¯x=49, and s=4, construct a confidence interval at a 90% confidence level. Assume the data came from a normally distributed population. Give your answers to one decimal place. < μ <

1. If n=18, ¯x(x-bar)=49, and s=4, find the margin of error at a 99% confidence level Give your answer to two decimal places. 2. If n=15, ¯x=49, and s=4, construct a confidence interval at a 90% confidence level. Assume the data came from a normally distributed population. Give your answers to one decimal place. < μ <

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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Question

1. If n=18, ¯x(x-bar)=49, and s=4, find the margin of error at a 99% confidence level

Give your answer to two decimal places.

2. If n=15, ¯x=49, and s=4, construct a confidence interval at a 90% confidence level. Assume the data came from a normally distributed population.

Give your answers to one decimal place.

< μ <

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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