Final Review 12/8

Increasing sample size makes the interval less precise

• true

• false

A 98% confidence interval is wider than a 95% confidence interval

• true

• false

What distribution do we use for confidence interval of the mean

• z distribution

• t distribution

• chi squared distribution

power decreases when alpha increases

• true

• false

we use side by side histograms to compare means of two samples

• true

• false

which is not a condition for confidence interval of the proportion

• randomization

• success/ failure

• nearly normal

• 10%

which is not a condition for sampling distribution of the mean

• 10%

• independence

• nearly normal

• randomization

If we have an alpha of 0.05 and a p-value of 0.02, we...

• fail to reject the null

• reject the null

• accept the null

Which is not a part of a confidence interval interpretations?

• alpha level

• confidence level

• upper limit

• lower limit

When you reject a true null it is a

• type 1

• type 2

• power