Question: For the completely healed index corn at sixmonth postrandomisation outcome and data in Table 8.11 calculate the degrees of freedom for the chisquared test statistic.

For the completely healed index corn at six‐month postrandomisation outcome and data in Table 8.11 calculate the degrees of freedom for the chi‐squared test statistic.

A. 1 B. 2 C. 3 D. 4 E. 5

Table 8.11

Randomised (n) Examination post-randomisation (months) 6 9 12 Corn plaster Scalpel 101 101 27/74 24/80 18/55 22/64 20/43 16/51

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