What is a z-test, when is it used, and what does it tell us?

Expert Solution

milcah answered 7 months ago

a. What does a significance test tell us? When do you use a 1 tailed t-test?...

a. What does a significance test tell us? When do you use a 1 tailed t-test? When do you use a 2 tailed t-test? b. What is the difference between statistical significance and effect size? What information does each of these measures provide?

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what does Hamilton's rule tell us? a) when relatedness is low, benefit to the recipient is...

what does Hamilton's rule tell us? a) when relatedness is low, benefit to the recipient is lower and the cost to the actor is low, then the natural selection should favor individuals that help their kin. b) animals need to calculate Br and C c) if Br > C then genes encoding altruistic acts towards kin will tend to spread in a population d) when relatedness is low, benefit to the recipient is high, and the cost to the actor...

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what does the variance and standard deviation tell us?

What exactly does the pooled variance in an independent samples t-test tell us?Why is it necessary...

What exactly does the pooled variance in an independent samples t-test tell us?Why is it necessary to modify this formula for unequal values of n?

3. What does the test statistic tell us? 4. Why do we divide by the standard...

3. What does the test statistic tell us? 4. Why do we divide by the standard error when computing a test statistic? 5. Why do we reject the null hypothesis when the p-value is small? Explain as if to someone unfamiliar with statistics.

a)When is it appropriate to calculate a z-test? b)What is the formula for a z-test? c)If...

a)When is it appropriate to calculate a z-test? b)What is the formula for a z-test? c)If we set α = 0.10 what does that tell us? d)If p < α then what should you do? e)What is the z-table used for when conducting a z-test? f)What are the 7 steps for hypothesis testing?

Is the z-test the same as the t-test but only used when we know the true...

Is the z-test the same as the t-test but only used when we know the true value of population mean's variance? But in practice, I'm assuming that the population mean's variance is never observed so I'm confused why we use the z-test. When will the z-test be helpful when the t-test is not if we never know the population mean's variance in real life? What are the other two differences between the two tests?

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