We have covered all the new material from this chapter. Your test will be on Tuesday, March 31.
HW for this weekend: AT LEAST three problems (not all odd) from the Chapter 14 chapter review. If you are struggling, do more problems. Bring all your CH 14 homework for credit on Tuesday.
Preview for after the test: We will be re-doing inference for regression (linear regression t-tests and confidence intervals) and power of the test.
Problems 11, 15, 16, and 24 are due Friday.
Problems 14.3, .4, .5, and .8 are due Wednesday.
HW due Tuesday: Using the data from your M&M bag, compare the sample distribution with the OLD theoretical distribution of BROWN 30%, RED 20%, YELLOW 20%, BLUE 10%, ORANGE 10%, and GREEN 10%. Perform a complete goodness of squares analysis of your data. If you misplaced your data, I guess you'll have to use a second bag of M&Ms. A complete analysis includes all the elements of SCAD.
Friday, March 27, 2009
Wednesday, March 18, 2009
Chapter 13 Two-sample tests
We're starting with tests of differences between two proportions. Usually our hypothesis is that there is no difference. Of course, we could look for a difference! Testing on Thursday, 3/19.
Bring all your HW from this chapter to the test on Thursday.
Problems 46 and 48 are due Wednesday.
Problems 13.41-44 are due Tuesday. Also, review your rules for variances. The variance of the difference of two means is equal to the sum of the variances of the two means. What is the variance of x-bar minus 3*y-bar if x and y are independent? Know your stuff.
Problems 15-18 should be done for Monday. Also, complete the hypothesis test from class:
Ho: mu E - mu N = 0 vs Ha: mu E -mu N < mu =" 7.26" dev =" 6.94" n =" 100" mu =" 9.55" dev =" 5.88" n =" 100" color="#ff0000">Your test on this chapter is on Thursday of next week.
HW due Thursday: Problems from the book 13.2, 3, 5, and 27, PLUS complete SCAD write-ups of the hypothesis test and confidence intervals for the differences in proportions from the census data linked below. We are looking for the difference between the % of adult Americans who have graduated from high school for women and for men.
Interesting 2-proportion statistic: http://www.census.gov/Press-Release/www/releases/archives/education/000818.html
People in the Lassiter area are happier than most: http://www.ajc.com/health/content/health/stories/2009/03/11/states_of_happiness_georgia.html?cxntlid=homepage_tab_newstab
HW due Wednesday: write up a complete (SCAD) response to the activity in class today. PLUS, read and create an outline for the second section of chapter 13.
Bring all your HW from this chapter to the test on Thursday.
Problems 46 and 48 are due Wednesday.
Problems 13.41-44 are due Tuesday. Also, review your rules for variances. The variance of the difference of two means is equal to the sum of the variances of the two means. What is the variance of x-bar minus 3*y-bar if x and y are independent? Know your stuff.
Problems 15-18 should be done for Monday. Also, complete the hypothesis test from class:
Ho: mu E - mu N = 0 vs Ha: mu E -mu N < mu =" 7.26" dev =" 6.94" n =" 100" mu =" 9.55" dev =" 5.88" n =" 100" color="#ff0000">Your test on this chapter is on Thursday of next week.
HW due Thursday: Problems from the book 13.2, 3, 5, and 27, PLUS complete SCAD write-ups of the hypothesis test and confidence intervals for the differences in proportions from the census data linked below. We are looking for the difference between the % of adult Americans who have graduated from high school for women and for men.
Interesting 2-proportion statistic: http://www.census.gov/Press-Release/www/releases/archives/education/000818.html
People in the Lassiter area are happier than most: http://www.ajc.com/health/content/health/stories/2009/03/11/states_of_happiness_georgia.html?cxntlid=homepage_tab_newstab
HW due Wednesday: write up a complete (SCAD) response to the activity in class today. PLUS, read and create an outline for the second section of chapter 13.
Wednesday, March 04, 2009
Chapter 12 Tests about means and proportions
If you missed the test on Monday, please make it up Tuesday in room 214 at 7:20 AM. If you are involved in Model UN, please make it up in room 313 at 7:20 on Wednesday morning.
In this VERY SHORT chapter we practiced the methods that we use for simple tests in the real world.
Test is Monday!!! Please try out the online interactive software Crunch It that the publisher provides. Just search on Crunch It. It does a lot of the same things that Minitab does and in the same ways.
HW due Friday: Because the problems from last night were mostly odds, tonight's assignment involves evens. Do two even problems from the chapter review. Your test is Monday.
HW due Thursday: EITHER 12.9, 19, & 37 OR 12.3, 13, 23, 29, 31, & 34.
To get credit, all work must be shown. Copying out of the back of the book will not suffice.
HW due Wednesday: 12.15, .16, .18,. .24, & .26.
HW due Monday: Read through the first section, taking notes on the key differences between previous chapters and this one. Pay particular attention to the standard errors and the kind of test used as well as the changes to assumptions/conditions. Work problems 12.2, 12.4, 12.5, 12.6, and 12.12.
In this VERY SHORT chapter we practiced the methods that we use for simple tests in the real world.
Test is Monday!!! Please try out the online interactive software Crunch It that the publisher provides. Just search on Crunch It. It does a lot of the same things that Minitab does and in the same ways.
HW due Friday: Because the problems from last night were mostly odds, tonight's assignment involves evens. Do two even problems from the chapter review. Your test is Monday.
HW due Thursday: EITHER 12.9, 19, & 37 OR 12.3, 13, 23, 29, 31, & 34.
To get credit, all work must be shown. Copying out of the back of the book will not suffice.
HW due Wednesday: 12.15, .16, .18,. .24, & .26.
HW due Monday: Read through the first section, taking notes on the key differences between previous chapters and this one. Pay particular attention to the standard errors and the kind of test used as well as the changes to assumptions/conditions. Work problems 12.2, 12.4, 12.5, 12.6, and 12.12.
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