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7. 2/6 points Previcus Answers DevoreStat9 8.E.021 My Notes Ask Your Teacher The desired percentage of SiO2 in a certain type of aluminous cement is 5.5. To test whether the true average percentage is 5.5 for a particular production facility, 16 independently obtained samples are analyzed. Suppose that the percentage of SiO2 in a sample is normally distributed with = 0.30 and that x = 5.21. (Use -0.0 (a) Does this indicate conclusively that the true average percentage differs from 5.5? State the appropriate null and alternative hypotheses. Ho: = 5.5 Hai +5.5 Ho: = 5.5 Ha: 5.5 H0: = 5.5 Hai ,12 5.5 Calculate the test statistic and determine the P-value. (Round your test statistic to two decimal places and your P-value to four decimal places.) P-value- State the conclusion in the problem context Reject the null hypothesis. There is sufficient evidence to conclude that the true average percentage differs from the desired percentage. Do not reject the null hypothesis. There is not sufficient evidence to conclude that the true average percentage differs from the desired percentage Do not reject the null hypothesis. There is sufficient evidence to conclude that the true average percentage differs from the desired percentage Reject the null hypothesis. There is not sufficient evidence to conclude that the true average percentage differs from the desired percentage

Explanation / Answer

a)

z = -3.87

p=0.0001

b)

beta = 0.004343 = 0.0043

power = 0.995657

= 0.9957

c) 15

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