Enjoy learning Statistics Online! Please be sure to share and subscribe to our YouTube channel.
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
Hello professor, for homework 9.10 numbers 42 and 45 aren't fractions. How do I know which d.f to look up in the top row and which to look up in the left column. Both problems have the same exact claim yet in number 42, n2 is on the top row and n1 is on the left column...but number 45 is the opposite, n1 is on the top and n2 is on the left. I don't understand this because the claims for both problems are identical. Thanks.
Posted to STATS 2 on Wednesday, October 8, 2014 Replies: 1
Hi Cristina,
It is not the claim that determines the test statistic in these problems. We use the sample variances to determine the test statistic, which in turn, leads to the critical value. The test statistic is formed by placing the larger standard deviation or variance on top of the fraction. The sample that has the larger standard deviation (or variance) becomes your numerator, and the sample size associated with that sample is what leads to the numerator degrees of freedom.
Hopefuly, that answers your question.
Professor McGuckian
STATS1
STATS2
HOME