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13 Cards in this Set

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One sample z interval for proportions

Finding z*

2nd VARS 3:invnorm((1-C)/2, 0, 1)

Choosing sample size for proportions

One sample z interval for means

Choosing sample size for means

Finding t*

2nd VARS 4:invT((1-C)/2, n-1)

One sample t interval for means

Random Condition

SRS of size n

Normal Condition for proportions

np >= 10 and n(1-p) >= 10

Normal Condition for means

stated normal, graph is approximately normal, or n >= 30 (Central Limit Theorem)

Independent Condition

all observations are independent AND n =< 1/10N

Interpreting a Confidence Level

In [C%] of samples of the same size

Interpreting a Confidence Interval

We are [C%] confident that our interval from [lower] to [upper] capture the true [proportion or mean in context].