PLEASE HELP THE ANSER THERE IS WRONG I ONLY HAVE ONE TRY LEFT HELLPPPP!!! A part

Question

PLEASE HELP THE ANSER THERE IS WRONG I ONLY HAVE ONE TRY LEFT HELLPPPP!!! A particular paper included the accompanying data on the tar level of cigarettes smoked for a sample of male smokers who subsequently died of lung cancer. Assume it is reasonable to regard the sample as representative of male smokers who die of lung cancer. Is there convincing evidence that the proportion of male smoker lung cancer deaths is not the same for the four given tar level categories at the a 05 level? (Use 2 decimal places. Tar Level Frequency 115 0-7 8-14 351 517 15-21 163 322.71 P-value interval O p 0.001 0.001 s p 0.01. 0.01 s p 0.05 0.05 s p 0.10 p 20.10

Explanation / Answer

Ho: Categories are the same
Ha: Categories are not the same

Let Expected = 115+351+517+163 = 1146= 1146 /4 =286.5 for each category [which would be true of they were "the same" ]

Run it through your chi-squared test with 4-1 = 3 d.f.

X^2 = summation[( observed - Expected)^2 / expected]

  

355.864

X^2 = 355.86

P-value = much less than 0.05, So, we do not reject the null hypothesis.

Tar level Observed Expected Obs -Exp (Obs -Exp)^2 (Obs -Exp)^2/Exp 0-7 115 286.5 -171.5 29412.25 102.661 08 14 351 286.5 64.5 4160.25 14.521 15-21 517 286.5 230.5 53130.25 185.446 >=22 163 286.5 -123.5 15252.25 53.236 Total

355.864

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