I've been having trouble with this and need help! Please? Rhea has decided to survey only patients who have been actively following a Mediterranean diet for at least six months. She has grouped these patients by age: 40-49 years, 50-59 years, and 60-69 years. Given these age groups, how should she choose her sample to find the effects of the Mediterranean diet? Why?

1. why is a frequency distribution useful? it allows researchers to see the "shape" of the data. it tells researchers how often the mean occurs in a set of data. it can visually identify the mean. it ignores outliers. 2. the is defined by its mean and standard deviation alone. normal distribution frequency distribution median distribution marginal distribution 3. approximately % of the data in a given sample falls within three standard deviations of the mean if it is normally distributed. 95 68 34 99 4. a data set is said to be if the mean of the data is greater than the median of the data. normally distributed frequency distributed right-skewed left-skewed