Question
How to test a hypothesis about a mean ?
Decide what is H0
Decide about what tail(s) is alpha on.
Find the critical value, draw Normal dist curve and shade the rejection zone

Find mean and SD of the sample
$$\sigma^{2} \approx s^2 = {\sum{X^2}-{(\sum {X})^2 \over {(n)}}\over (n-1)}$$
OR use sigma from the population.
Use formula : $$Z = {(\hat {X} -\mu) \over {s\times\sqrt {n}}}$$

Calculate $$\hat{\alpha}$$ : if ess than α, reject the null hypothesis

Question
How to test a hypothesis about a mean ?
?

Question
How to test a hypothesis about a mean ?
Decide what is H0
Decide about what tail(s) is alpha on.
Find the critical value, draw Normal dist curve and shade the rejection zone

Find mean and SD of the sample
$$\sigma^{2} \approx s^2 = {\sum{X^2}-{(\sum {X})^2 \over {(n)}}\over (n-1)}$$
OR use sigma from the population.
Use formula : $$Z = {(\hat {X} -\mu) \over {s\times\sqrt {n}}}$$

Calculate $$\hat{\alpha}$$ : if ess than α, reject the null hypothesis
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owner: naxplast06 - (no access) - Deviant S. - The Practically Cheating Statistics Handbook (2010, CreateSpace Independent Publishing Platform).pdf, p126

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