Which of these is an example of a random sample?
a. mrs. baker selects the 10 students whose names are drawn from a bag to fill out a survey.
b. mrs. baker selects the 10 students who arrived to class first on monday to fill out a survey
c. mrs. baker selects the 10 students with the highest grade point averages to fill out a survey.
d. mrs. baker selects the 10 students who raised their hands to volunteer to fill out a survey.
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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