Facts bout the Normal Distribution (Random Variable) 1. The Normal Distribution is completely determined by: a: mean, (population) X is the mean of a sample drawn from that population b: Standard Deviation, (population), S is the standard deviation
CHAPTER 10 Confidence Intervals There are two types of estimators in statistcis POINT estimate and INTERVAL estimates 1- is called a confidence level is called a significance level.
A (1 - ) x 100% Confidence Interval for Assumptions: 1. Normal Pop
THE REJECTION REGION METHOD Page 346 11.37 n=20 =50 =.05 X=569 1. Ho: = 560 Ha: > 560 2. =.05 3
Z=
X n
=
569 560 = 0.80 50 20
If the results you get were:
what would you do? -10 -shouldn't come into play because you shouldnt set it up so it
Ho Drug is safe Ha Drug is Unsafe
Ho Drug is Unsafe Ha Drug is Safe
Conclude that drug is unsafe when it is Conclude that drug is Type I Error actually safe safe when it is unsafe Conclude that druge Conclude that the is safe when it really drug is
7 Problems on test like quizes. independent two sample t-test, equal and unequal variance also a paired t-test Understand printouts, what you need and don't need Two sample t-test tests for differences between populations Problems 13.26 For unequal v