For Exercises 7.1 and 7.2, see page 360; for 7.3 and 7.4, see page 362; for 7.5 to 7.7, see page 365; for 7.8 and 7.9, see page 368; for 7.10 and 7.11, see page 371; and for 7.12 and 7.13, see page 372.

Question 7.6

7.6 Significant?

A test of a null hypothesis versus a two-sided alternative gives .

  1. The sample size is 13. Is the test result significant at the 5% level? Explain how you obtained your answer.
  2. The sample size is 9. Is the test result significant at the 5% level?
  3. Sketch the two distributions to illustrate your answers.