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STAT Exam 2 (10 Karten)

Sag Danke

What is the mean (expected value, average) of a discrete distribution?

mean = SIGMA [x * P(x)]

Is the # of words in a magazine article discrete or continuous?

Discrete

Is the weight of an athlete discrete or continuous?

Continuous

Is the time taken to complete a race discrete or continuous?

Continuous

Is the number of clubs in a drawing discrete or continuous?

Discrete

What does x = 30th percentile mean?

30% of the data falls below x.

How do you find the shape of sample data (data distribution)?

Same shape as the population.

How do you find the shape of a Sampling Distribution?

You know it is NORMAL if:

The population is Normal

OR

N > 30

Otherwise, you can make no conclusion about shape.

As the sample size n increases, what happens to the mean and the standard error?

The mean stays the same, the standard error goes down.

How do you find the shape of the sampling distribution of the sample proportion?

It is NORMAL when:

np >= 15

AND

n (1-p) >= 15

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Veröffentlicht: 02.03.2010

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