2) Men with prostate cancer were randomly assigned to undergo surgery (n=347 ) o
ID: 3219614 • Letter: 2
Question
2) Men with prostate cancer were randomly assigned to undergo surgery (n=347 ) or “ watchful waiting” ( no surgery, ). Over the next several years there were 83 deaths in the first group and 106 deaths in the second group. The results are given in the table. Preform the chi-square test to determine whether the treatment and survival are independent of each other.
Surgery
WW
Total
Died
83
106
189
Alive
264
242
506
Total
347
348
695
Surgery
WW
Total
Died
83
106
189
Alive
264
242
506
Total
347
348
695
Explanation / Answer
H0:treatment and survival are independent of each other
H1: treatment and survival are not independent of each other
alpha:5%
Test statistic:
Chi square cal=3.75
Chi square critical value at 1 df is 3.84
Conclusion:
Chi square cal < Chisquare critical value we do not reject the H0.
Hence treatment and survival are independent of each other
Oi ei (oi-ei)^2/ei 83.00 94.36 1.37 106.00 94.64 1.36 264.00 252.64 0.51 242.00 253.36 0.51 sum= 3.75Related Questions
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