IQs revisited Based on the Normal model N(100, 16) describing IQ scores, what percent of peoples IQs would you expect to be a) over 80? b) under 90? c) between 112 and 132?
Sampling Distribution of P hat 1. Center P= mean of p hat 2. Spread Standard deviation of p hat = Square root over all (P(1P)/n) 3. Shape p hat is “normal” meaning n multiplied by p or n(1p) has to be greater or equal to ten. Should be bellshaped. General Margin of error: Confidence level multiplier multiplied by standard error Hoping that the statistic is not wrong by more than the margin of error guessed Statistic: Guessing the parameter. Never know how wrong you might guess Standard error: approximation of standard deviation of p hat P hat = square root over all (p hat (1p hate)/n) Confidence level population proportion 1. Statistic p h