Each individual in a sample of nursing home patients was cross-classified both with respect to cognitive state (normal or mild impairment, moderate impairment, severe impairment) and with respect to drug status (psychotropic drug change, psychotropic user without a change, no psychotropic medication). The following Minitab output resulted from a request to perform a chisquared analysis.
a. Verify the expected frequency and contribution to x2 in the normal-drug change cell of the two-way table.
b. Does there appear to be an association between cognitive state and drug status? State and test the appropriate hypotheses using a significance level of .01. [Note: The cited article reported a P-value.]