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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

Hello professor,
I'm not getting question number 61 from the mixed review of chapter 11? I'm keep getting wrong answers.

Posted to STATS 2 on Tuesday, November 11, 2014   Replies: 2


Professor Mcguckian
11/11/2014
11:41 PM EST

Hi,

This problem wants a confidence interval for the slope:

Step 1: get your data

n = 6

\scriptstyle\hat\beta = 0.842

SSxx = 619.333

S = 2.803

Step 2: get your t-critical value (remember, the degrees of freedom are n - 2 in this chapter)

ta/2, n - 2 = t0.025, 4 = 2.776

Step 3: Get your margin of error E = ta/2 * S / SqrRoot(SSxx) = 2.776 * 2.803 / SqrRoot(619.333) = 0.3126658

Step 4: ( \scriptstyle\hat\beta - E,  \scriptstyle\hat\beta + E) = ( 0.842 - 0.3126658, 0.842 - 0.3126658 ) = 0.529 to 1.155.

 

Hope that makes sense,

Professor McGuckian


.
11/12/2014
8:37 AM EST
Thank you so much professor !!

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