The amount of Original coronary artery disease chest pain is

The amount of Original (coronary artery disease) chest pain is categorized by the Canadian Heart Classification from mild (class I) to severe (class IV). Compute the chi-square statistic lor trend. Using Table A,3, give the strongest possible statement about the value. Compute, where not given, the percentage of operative mortality, and plot the percentage for the different categories using equally spaced intervals. The usual chi-square statistic (with k - 1 degree s of freedom) is given with its value. When possible, from Table A.3 or the chi-square values, tell which statistic is more highly significant (has the smallest p-value). Does your figure in (b) suggest why? Critical values (percentiles) for the chi-Square Distribution For each degree of freedom (d, f.) in the first column, the table entries are the critical values for the upper one-side significance levels in the column headings or, equivalently, the percentiles for the corresponding percentages.

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