Question #215644

A melting point test ofinwant to test the claim that the temperature is different from*x *D154*:*2 *F*. Assume that the melting point is normally distributed with*n *D10 samples of a binder used in manufacturing a rocket propellant resulted155 *F: *Test the hypothesis atD1*:*5 _{F}*: *Suppose youD_{0}*:*_{05}*:*

Expert's answer

The following null and alternative hypotheses need to be tested:

"H_0:\\mu=155"

"H_1:\\mu\\not=155"

â€‹This corresponds to a two-tailed test, for which a z-test for one mean, with known population standard deviation, will be used.

Based on the information provided, the significance level isÂ "\\alpha=0.05,"Â and the critical value for a two-tailed test isÂ "z_c=1.96."

The rejection region for this two-tailed test is"R=\\{z:|z|>1.96\\}."

The z-statistic is computed as follows:

Since it is observed thatÂ "|z|=1.686548<1.96=z_c,"Â it is then concluded thatÂ the null hypothesis is not rejected.

Using the P-value approach:

The p-value isÂ "p=2P(Z<-1.686548)=0.09169,"Â and sinceÂ "p=0.09169>0.05=\\alpha,"Â it is concluded thatÂ the null hypothesis is not rejected.

Therefore, there is not enough evidence to claim that the population meanÂ "\\mu"

is different than 155, at theÂ "\\alpha=0.05"Â significance level.

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