# stats unit 7 Flashcards

POI for proportions

The POI is the true population proportion of ____.

A ssumptions for proportions

1) stated random sample

2) 10% condition

3) n(p-hat) >(or equal to) 10

n(q-hat) >(or equal to) 10

(we can assume to use approx. normal)

N aming the interval for proportions

One sample z-interval for proportions

Calc part for proportions

stat–>test–>option A

interval interpretation

We are __% confident that the interval from ___ to ___ captures the true _(context)__.

finding n for proportions

MOE = z-star sqr-root p-hat(q-hat) / n

(write it out)

ALWAYS ROUND UP

if p-hat is unknown …

p-hat = .5

(also known as a conservative p-hat)

confidence level (sentence)

If we make many __% confidence intervals, we expect about ___% to capture the true __(context)__.

(percents are the same value)

POI for mean

The POR is the true average ____context___.

A ssumptions for mean

1) stated random sample

2) 10% condition

3) - stated that population is normal

- n >(or equal to) 30 (CLT check)

- no strong skew or outliers (GRAPH)

—>we can assume to use approx. normal

N aming the Interval for mean

One sample for t-interval for means

Calc for mean

stat–>test–>#8

C onclusion foe mean must include…

UNITS

Solving for n

MOE = t-star (standard deviation /sqr-root n

write down the equation for mean

write down the equation for proportions