Question

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 σ = 0.30 and that x= 5.23. (Use α-0.05.) (a) Does this indicate conclusively that the true average percentage differs from 5.5? State the appropriate null and alternative hypotheses Hai μ < 5.5 Ho: μ = 5.5 Ha: fu 2 5.5 Ho: μ = 5.5 Hai μ > 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

Answer 1

a)

null hypothesis:Ho		μ	=	5.5
Alternate Hypothesis:Ha		μ	≠	5.5

test statistic           z             =	(x̄-μ)/σx=	-3.60
p value                                 =		0.0004

( please try p value =0.0003 if above comes wrong)

reject the null; there is sufificient evidence,,,,,

b)

power of the test =0.1075

c)

n=217