biostats10

# biostats10 - Heather Oslund BIO318M 50200 TA Janne T 3-5...

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Heather Oslund BIO318M 50200 TA: Janne T 3-5 Assignment 10 SPSS b. Histological grade is listed as scale but it should be ordinal. Histologic grade of breast cancer patients c. ii. The error bars tell the 95% confidence interval and say that there is a significant difference between the numbers of people in each grade since the error bars do not overlap. d. H 0 : The probability of having each grade is the same for each person. H 0 : Pr{grade 1}=Pr{grade 2}=Pr{grade 3}=0.333 H A : The probability of having each grade is not the same for each person. H A : Pr{grade 1}≠0.333 and/or Pr{grade 2}≠0.333 and/or Pr{grade 3}≠0.333

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Heather Oslund BIO318M 50200 TA: Janne T 3-5 Histologic Grade Observed N Expected N Residual 1 79 306.7 -227.7 2 514 306.7 207.3 3 327 306.7 20.3 Total 920 Test Statistics Histologic Grade Chi-Square 310.541 a df 2 Asymp. Sig. .000 a. 0 cells (.0%) have expected frequencies less than 5. The minimum expected cell frequency is 306.7. We did a chi-square test because the data is categorical. The p-value is less than 0.001 therefore the difference between grades is significant. e. The first histologic grade probably does not have as many patients in it because people with the lower grade may not know they have it. The third grade probably has a little bit less numbers of people because some of the people with the higher grade may have already died. The second grade
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## This note was uploaded on 02/22/2012 for the course BIO 318m taught by Professor Staff during the Spring '08 term at University of Texas.

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biostats10 - Heather Oslund BIO318M 50200 TA Janne T 3-5...

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