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Statistics for health, life, and social sciences

by: kyle dunham

Statistics for health, life, and social sciences Math 14500-02

Marketplace > Ithaca College > Math > Math 14500-02 > Statistics for health life and social sciences
kyle dunham
GPA 3.5

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About this Document

p-values hypothesis tests type 1 error type 2 error
Statistics for health, life, and social sciences
James E Conklin
Class Notes
25 ?




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This 2 page Class Notes was uploaded by kyle dunham on Thursday March 3, 2016. The Class Notes belongs to Math 14500-02 at Ithaca College taught by James E Conklin in Spring 2016. Since its upload, it has received 8 views. For similar materials see Statistics for health, life, and social sciences in Math at Ithaca College.


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Date Created: 03/03/16
Statistics First we did a warmup in class: A 90% confidence interval is an interval estimate for a ________ using a procedure which will capture the parameter 95% of the time. HYPOTHESIS TEST -We are seeing if our data is strong enough to rule out chance -To first setup a hypothesis test you should have a: Null Hypothesis: Ho =Both are about the population Alternative Hypothesis: Ha *Logic: We give Ho the benefit of the doubt to see if our results could have happened by chance. (This is like in a court case: INNOCENT UNTIL PROVEN GUILTY) example: We are going to test if more than 15% of Ithaca College students drank coffee today. So…… Ho: p=0.15 Ha: p>0.15 We used a sample in the class and our data showed that 4/25 of the students in our class drank coffee today p-hat=4/25=.16 next you would obtain a p-value…. P-VALUE A p-value is the probability that we would have obtained data as extreme or more extreme as we did if Ho (Null Hypothesis) was true. ***A p-value close to 0 means that your null hypothesis is usually false*** p-value for coffee drinkers was .539 which means that you can’t reject ho. The usual cutoff whether to reject or accept the null is less than .05 HYPOTHESIS TESTS -Tests for parameters -tests for means -tests for proportions -tests for difference in means -tests for difference in proportions LEVEL OF SIGNIFICANCE: IT is the cutoff for the p-value -If the significance level is .01 and the p-value is .02 than we can’t reject Ho (Null Hypothesis) TYPE 1 ERROR: Reject the null hypothesis, but the null hypothesis is actually true TYPE 2 ERROR: Fail to reject the Null hypothesis, but the null hypothesis is actually false.


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