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ASK THE PROFESSOR FORUM

Course Documents

Chapter 1 - Intro

Chapter 2 - Methods for Describing Sets of Data

Chapter 3 - Probability

Chapter 4 - Discrete Random Variables

Chapter 5 - Normal Random Variables

Chapter 6 - Sampling Distributions

Chapter 7 - Confidence Intervals

Chapter 8 - Tests of Hypothesis: One Sample

Chapter 9 - Confidence Intervals and Hypothesis Tests: Two Samples

Sample Exam I: Chapters 1 & 2

Sample Exam II: Chapters 3 & 4

Sample Exam III: Chapters 5 & 6

Sample Exam IV: Chapters 7 & 8

Ask the Professor Forum

For homework problem 13 in section 7.2 if I cant find it on the t-table, I tried looking on the z-table but its giving me the wrong answer. Can you please go over how to do it.

13: The confidence level is 92%. The sample size is 49. The sample mean is 512, and the population
standard deviation is 28.

Posted to STATS 1 on Sunday, November 17, 2013   Replies: 2


Professor Mcguckian
11/17/2013
10:33 PM EST

Hi Natalie,

The critical value for this confidence level was done in section 7.1, see the video below.

After finding that value the calculation becomes: E = 1.75*28/root(49) = 1.75 * 28/7 = 1.75*4 = 7

 

Professor McGuckian


.
11/20/2013
3:11 AM EST
Thank you!

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