# lecture4 - Probability proportion percent chance likelihood...

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Probability: proportion, percent, chance, likelihood | What have I been given? Mean m and SD s _________________________________________ sample size n and p , population proportion | Are np > 5 AND n(1 - p) > 5 ? Yes _____________________________________ No Do I have sample size n AND probability is for an Average ? PROPORTION_________________ BINOMIAL NO____________________________YES n, p, p ^ (sample proportion) n, p, X( # successes) | _ | | | P(X < 30 ) P( X < 32 ) P( p ^ < .75 ) P( X < 10 ) Must use Binomial Function Also must use the Binomial for exact probabilities ex. P (X= 3) Go to Binomial Probability notes Now use normalcdf ( Lower Bound, Upper Bound,
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Unformatted text preview: Mean, SD ) to get the probability. Use -1E99 for negative infinity, and +1E99 for positive infinity Probability given: Want to find the value of a point under the curve example: P ( X < a ) = .3 or P ( X > a ) = .7 NOTE: shade normal curve in the direction of the arrow and the size of shaded area must equal the probability Use invNorm ( Percentile at the desired point under the curve, Mean, SD ) This gives the value of a in the probability statement. Make sure you use the correct mean and SD ) 1 ( SD n mean ) 1 ( SD mean n SD mean SD mean p np p n p p p-= =-= = = = = = s...
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