APSTAT UNIT 4A INFERENCE PART 1. APSTAT Chapter 18 Sampling Distributions and Sample Means. Lets Just DO IT!!!!. Proportion of correct answers on last AP Stat Exam. Regular Old Distribution:. .55-.59 .60-.64 .65-.69 .70-.74 .75-.79 .80-.84 .85-.89. Lets Just DO IT!!!!.
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Proportion of correct answers on last AP Stat Exam
Regular Old Distribution:
.55-.59 .60-.64 .65-.69 .70-.74 .75-.79 .80-.84 .85-.89
Proportion of correct answers on last AP Stat Exam
Proportion of correct answers on last AP Stat Exam
Class Sample Means:
Sampling Distribution
.55-.59 .60-.64 .65-.69 .70-.74 .75-.79 .80-.84 .85-.89
(estimate) ± (margin of error)
Standard error
TRUE POPULATION PROPORTION
p
But 90 and 99% aren’t Empirically CoolMargin of Error
Why 0.5? Gives us largest n value. Safety First!
OOPS! YOU SHOULD ALWAYS ROUND UP TO STAY WITHIN CONFIDENCE INTERVAL! SHOULD BE 1068.
We are using a sample here, so we throw in our sample standard deviation.
.58
WPS SAT Example Continued0
Alternative HypothesesDouble your one-sided P-value
0
POOLED
Pool if variances are equal (since our null theorizes that the populations – and thus the variances - are equal)
Use Non-Pooled because there is no null to test for.