Independent -  separate samples

Dependent  -  both samples same group,  ? before & after

                    - matched or paired data

Text has small samples so t-test

Assumptions and notation:     pg. 415
                     x- is "before"    and   y- is "after"

        The "sign" of d is often surprising  ...

           EX: Losing weight    x=150,  y=140, so d=10

                  Which means  d  >  0  represents losing weight
 

Test Statistics:

               Note:  In this text, , is generally 0

We'll do the test statistic with the calculator.

    Do with calculator
            Enter x-values as List 1
            Enter y-values as List 2
            Compute d=x-y in List 3 as List1-List2

Use t-test (#2 in STAT-TESTS) to calculate values

            ** Remember   List: L3

            **  Samples are SMALL so use Table A-3  t-values
 
 

#8.	c:  d > 0
=.05	:  d < 0
	:  d > 0

                                 Critical Value:  t = 1.796
 
 
 
 
 
 
 
 
 
 
 
 
 
 

#7    Chapter Review  -  pg. 470
 
 

=.05	c:  d = 0
	: d = 0
	:  d 0