Hey I've been working on this for awhile...So if someone can maybe double check my answers or clarify some things...

Suppose you want to know the distribution of the concentration of tobacco in a cigar brand. Assume dist. is approx normal with unknown mean and st.dev.

The mean concentration of tobacco in cigarettes is 81g. You want to find out if the mean concentration of tobacco in cigars is equal to that of cigarettes. A random sample of 9 cigars has a mean tobacco concentration of xbar =152g and st dev. 9g. At the .01 level of significance perform a hypothesis test.

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Hnull: mu = 81g ???

Halternative: mu not equal to 81g

now how exactly do i find the critical value??? (is it 3.55)

also i got 23.67 as the test statistic.

and the pvalue = 1.08E-8 (which im unsure how to do without a calculator)

also in interpreting the decision, i am confused.

So any help I would appreciate!