Thursday HW

Tomorrow in class we'll look through an example of a two-tailed test (from our slides) to finish our notes, and then (hopefully) get some practice in. 

Thursday's HW:

• Please complete the full hypothesis test process for each of the three context below:
• Hypotheses 
• Conditions 
• "Math" 
• Conclusion
• You will get some very high/low (far from 0) z scores and some p-values that are = 0...this is because I took real studies for these rather than using "cookie cutter" test questions
• This should be reflected in our sketch!
• Remember, the "shaded region" represents the p-value, so if the p-value is 0 then nothing should be shaded!
• #1 is very much like our cereal example from class....
• If an alpha level (aka significance level) is not given, pick one! (1%,5%, or 10%)
• #'s 2 and 3 are "two tailed tests"--the only difference here is the sketch of the Normal model....
• Use your calculator to sketch the model
• Tomorrow we'll discuss these in more detail....
• Here is our writing template to use for your conclusions:
• "The pvalue of   p-value   is less/greater than the alpha/significance level of   alpha  , so we reject/fail to reject the null hypothesis. There is/is not evidence to suggest    (describe Ha in context; copy the question!)    .

Wednesday's HW (you can show me tomorrow for credit still!)

Page 470-472: 3, 9, 11cd, 12abcd

• 3 = understanding what a p-value represents
• 9 = find errors!
• 11cd = math and interpret p-value
• 12abcd = hypotheses, conditions, math, interpret p-value
• Interpret PValue Template:

• If ____(Ho is true, in context)_______, there is a   pvalue   % chance that we would get a sample statistic (p-hat) of   p-hat   or larger/smaller (pick one).

Today's Class Recap:

• Stamp = Hypotheses and Math practice
• HW Questions?
• Back to ch. 20 notes....
• What is a p-value? How can we interpret p-value in context?
• How does a p-value lead us to reject or fail to reject the null hypothesis?
• What is an alpha/significance level? (back to #7)....:
• How can we write a conclusion for a hypothesis test (comparing p-value to alpha level)?
• Provided a template for writing our conclusions....