A sample of n = 25 individuals is selected from a population with µ = 80 and a treatment is administered to the sample. What is expected if the treatment has no effect?
A) ?The sample mean should be very different from 80 and should lead you to reject the null hypothesis.
B) ?The sample mean should be very different from 80 and should lead you to fail to reject the null hypothesis.
C) ?The sample mean should be close to 80 and should lead you to reject the null hypothesis.
D) ?The sample mean should be close 80 and should lead you to fail to reject the null hypothesis.
D
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The advent of antipsychotic drugs in the 1950s ________
a. delayed important research on the effectiveness of shock therapy b. led to renewed efforts to prevent mental illness c. created a favorable climate for the policy of deinstitutionalization d. was the catalyst for the founding of crisis intervention programs