An airline is interested in measuring the customer satisfaction of its passengers in all of its domestic flights on a certain day. The data analysis team took all 22 domestic flights of that day that took off from a certain airport. They randomly selected 25 passengers from each flight to form a sample of 550 passengers. What sampling technique did the data analysis team use?
Stratified sampling

Simple random sampling

Quota sampling

Systematic sampling

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