This preview shows page 1. Sign up to view the full content.
Unformatted text preview: and AP are registered trademarks of the College Entrance Examination Board. 17 AP® STATISTICS
2002 SCORING GUIDELINES (Form B)
Question 6
Solution
Part (a):
Part 1: States a correct pair of hypotheses, with symbols defined.
µ1990 = mean number of lab classes for Biology majors in 1990
µ2000 = mean number of lab classes for Biology majors in 2000
H 0 : m1990 = m2000
H 0 : m1990 ¹ m2000 Part 2: H 0 : m1990  m2000 = 0
H 0 : m1990  m2000 ¹ 0 OR Identifies a correct test (by name or by formula) and checks (not just lists)
appropriate assumptions. Twosample t test t= x1990  x2000  0
s 21990 s 2 2000
+
n1
n2 = 1.83  1.93
1.292 1.37 2
+
200
200 Conditions:
1. Random samples – given in problem statement
2. Normal population distributions or large samples. Populations aren't
normal, but since n1 = 200 and n2 = 200 are both large, it is OK to
perform the t test.
OR
Student may select the twosample z test, using z = x1990  x2000  0
s 21990 s 2 2000
+
n1
n2 as long as they comment on the large sample size. Copyright © 2002 by Colle...
View
Full
Document
This note was uploaded on 09/06/2013 for the course MATH AP Statist taught by Professor Mosby during the Spring '13 term at Silverton High School, Silverton.
 Spring '13
 Mosby
 Statistics, AP Statistics

Click to edit the document details