| Moore
Ch.
14, Day 35 Hand
in Monday A. New Shoeboxes: On a Separate sheet: (2 shoeboxes. )The shoeboxes are outside my door if you missed doing them in class. For each sample of size 4 from a shoebox, write down the values, find the mean, (know which box you got them from: White #s, green box. Yellow, red top.) and tell whether you believe the population mean for that box is 20, or something bigger. (Your gut feeling.) Does it help to know that the standard deviations for the shoeboxes are both 4? ( Bring your sample numbers and xbars to class to pool.) (This is related to Chapter 15, where we'll learn the formal methods.) |
Read, to discuss |
Optional A few problems good to review for the exam p. 419, 17.7 Day care, parameter or statistic p. 422, 17.27 and 28 means vs. individuals. In #27, they're taking the "about what range" to be the interval containing the middle 99.7%--almost all. (Answer to last question of #28 is "no"--histogram of individual values in sample will be distributed (roughly) like the population.) p. 421, 17.26 WAIS, n = 1, n = 60 (Answers: a) about .3707, b) 100, 1.936, c).0049, d) a could be quite different; b still correct, c approx. right bcs of Central Lim. Th.)) |
Buffer
against
one low hour exam:
The final % exam grade minus 10 points will be substituted for the
lowest hour exam grade, if it is higher.
| Examples: | Ex1 | Ex2 | Ex3 |
Ex4 | final % | final -10 | |
| Student 1 | Original | 85 | 80 | 85 |
60 | 85 | 75, replaces lower 60 |
| Treated | 85 | 80 | 85 |
75 | 85 | <--ß These will be used. | |
| Student 2 | Original | 85 | 80 | 80 |
70 | 75 | 65, lower than 70, don't replace. |
| Treated | 85 | 80 | 80 |
70 | 75 | ||
| Student 3 | Original | 85 | 50 | 75 |
55 | 85 | 75, replaces lower 50 |
| Treated | 85 | 75 | 75 |
55 | 85 | <--ßThese will be used |
| Sievers home | Math151-Sp07/Daysp36.htm | 7:30pm | 4/26/07 |