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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
9.5 t-Interval to Compare Two Population Means: Independent Samples (Unequal Variances)
A researcher wants to know if statisticians in the private sector are paid better than statisticians in the public sector. She selects random samples from both areas the results are summarized below. Form a 95% confidence interval for the average difference between the salaries of government statisticians and private sector statisticians (Do not assume equal variances).
Government Private
n = 26 n = 28 sample mean = 35.50 sample mean = 54.60 s = 4.16 s = 4.4
STATS1
STATS2
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