An industrial psychologist consulting with Lara music stores knows that the average number of complaints management receives each month throughout the industry is 5, but the standard deviation is unknown. Fifteen of the Lara music stores were randomly selected to record complaints for one month; the mean of this sample was 3 and its standard deviation was 2.5. Using the .05 significance level, is the number of complaints received by Lara music stores different from the number of complaints received by music stores in general

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