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3. Hypothesis tests about a population mean, population standard deviation unknowrn Aa Aa Airlines compute the weight of outbUse the Distributions tool to develop the rejection region. According to the rejection region method, when do you reject the

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Answer #1

Since population standard deviation is not given but sample size is 64>30, so we use  -Normal test.

The test static follows Normal-distribution. The value of the test static is

z={17.2-16\over 6.2/\sqrt{64}}\approx 1.548

So critical value is z=1.645

So reject the null hypothesis if

z\geq 1.645

The P-value is  P(z>1.548)=0.0608 using t table

Using the rejection region, the null hypothesis is Rejected.  As the value of test static lies inside the acceptance region

Using the P-value method the null hypothesis is Rejected. As P-value is greater than 0.05.

So there is enough evidence to support the claim that the mean has increased.

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