asign7
PSY 305 Assignment 7
Assignment 7
· Round each decimal answer to two digits or you will get incorrect results on your work and your will get no points in D2L. Only the precise answer obtained after rounding to the two decimal places will be correct.
The following is data from a drug study to see if animals survived better receiving a drug compared to those that did not.
Ho: The survival of the animals is independent of drug treatment.
Ha: The survival of the animals is associated with drug treatment
Complete the row & column totals in the following contingency table and calculate the expected values and fill in the blank for that follow.
|
|
Dead |
Alive |
Total |
|
Treated |
36 (___6) Cell A |
14 (___7)Cell B | |
|
Not treated |
30 (___8)Cell C |
25 (___9) Cell D |
_____4 |
|
Total |
_______1 |
______2 |
_____5 |
Remember that,
Expected value for Cell A = (Row Total item 3) x (Column Total item 1)/Grand Total (item 5)
Expected value for Cell B = (Row Total item 3) x (Column Total item 2)/Grand Total (item 5) 18.53
Expected value for Cell C = (Row Total item 4) x (Column Total item 1)/Grand Total (item 5) 34.57
Expected value for Cell D = (Row Total item 4) x (Column Total item 2)/Grand Total (item 5)
20.43
10. The X2 for this study is 3.418. What is its df? ____
11. What is the critical value for a X2 with this df at the .05 level? (Table C-7)________
12. Based on this information did we find support for the claim that the survival of the animals
depends on the drug treatment?
A. Yes
B. No