The difference in the observed neurological disease rate, xbar, for a sample of veterans who served in Iraq is not  “statistically significantly different” (alpha = .05), from the overall population disease rate for all U.S. veterans, mu0. This means: a. xbar = mu0b. The disease rates xbar and mu0 are not equal, but the size of the difference is not practically important, not big enough to matter. c. H0: mu for Iraq vets =  mu0   was not rejected  d. None of the above

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