For Exercises 15–18, do the following:

  1. Check the normality conditions.
  2. State the hypotheses.
  3. Find and the rejection rule.
  4. Calculate .
  5. Compare with . State the conclusion and the interpretation.

Question 9.284

18. Test whether differs from 0.4. A random sample of size 900 yields 400 successes. Let level of significance .