A TV special said there is a 10 per cent incidence of sexually transmitted disease (STD) among all U.S. teens. A reporter for the Rockville Bugle, looking for a story, surveyed 260 randomly chosen teenagers, and found that 39 had been to a clinic for STD treatment. Use a right-tail test at α = .05.

John rejected a null hypothesis in a right-tailed test for a mean at α = .025 because his critical t value was 2.000 and his calculated t value was 2.345. We can be sure that

In a left-tailed test at α = .05 we would
comfortably reject the claim.
comfortably accept the claim.
feel uncomfortable with either decision (too close).
switch to alpha of 0.01 for a more powerful test.

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