9.78 PCBs, continued Refer to Exercise 9.77. a. Calculate and 1- if the true mean ppm of

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9.78 PCBs, continued Refer to Exercise 9.77.

a. Calculate and 1- if the true mean ppm of PCBs is 6 ppm.

b. Calculate and 1- if the true mean ppm of PCBs is 7 ppm.

c. Find the power, 1-B, when u 8, 9, 10, and 12. Use these values to construct a power curve for the test in Exercise 9.77.

d. For what values of does this test have power greater than or equal to 0.90?

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