Biostatistics, Chapter V & VI Notes

The ________ is greater than one, increases when sample size decreases.

standard deviation

________: all random samples of the same size n (when large enough), the distribution of Z is approx. normal with mean 0 and variance 1.

Central Limit Theorem

________ has the same general shape as the normal distriution.

T distribution

The ________ must be greater than or equal to 25 to do the t distribution without the normal assumption.

sample size

μ) / (σ * 1/sqrt(n))

Z = (Ȳ

all random samples of the same size n (when large enough), the distribution of Z is approx. normal with mean 0 and variance 1

Central Limit Theorem

when something asks for the probability of "at most two" sum the probabilities for 0, 1, and 2

Note

), it becomes (Z > )

To flip (Z <

Two types of statistical inference

estimation, hypothesis testing

(confidence) divided by 2

Alpha = 1

Margin of error is the same as the...

Confidence interval

T or F: The confidence interval should include the given values in a problem

True

Sigma must switch to ________ when finding the t distribution

S

Sample size and confidence interval are _________ related.

Inversely

We are % confident that the average something for the __________ is within the confidence interval.

Population

The lower the confidence interval percentage is, the ___________ the actual interval becomes.

Narrower

Increasing the sample population makes the confidence interval...

Narrower

If sigma is not given, we must...

Find it

We divide alpha by two because...

There are two sides of the t distribution curve (a lower and an upper) that must be considered

Degree of freedom for a normal distribution

infinity