Colorblindness About 8% of males are colorblind. A researcher needs some colorblind subjects for an experiment and begins checking potential subjects. a) On average, how many men should the researcher expect to check to find one who is colorblind? b) Whats the probability that she wont find anyone colorblind among the first 4 men she checks? c) Whats the probability that the first colorblind man found will be the sixth person checked? d) Whats the probability that she finds someone who is colorblind before checking the 10th man?

STAT 2004 CHAPTER ONE: WEEK 4 SAMPLE STATISTICS n 2 1 2 Sample variance- s = n−1 i=1x ix´) Sample standard deviation- Tells you how spread out your data is. It is the square root of the variance. QUANTILES Also known as percentiles. o If you are in the 70 percentile, you are better than 70% of your class and not as good as 30%. DISTRIBUTION Describes shape, center, and spread/variation of data. For the images below, imagine histograms that fit the depicted curves. BOXPLOT A boxplot uses a five number summary consisting of the median (Q ), 2