Thomas is researching locations to live after high school and asks his family members about the number of different places they have lived. let a be the set of the number of places where nine of thomas' family members have lived after high school. a = {3, 2, 7, 8, 6, 8, 3, 4, 3} thomas forgot that his uncle traveled with the military and has lived in 15 different places since high school. let b represent the set of the number of places where all ten of his family members, including his uncle, have lived after high school. select the true statement. the interquartile range of a is 0.5 more than the interquartile range of b. the mean of b is the same as the mean of a. the interquartile range of a is 1.5 less than the interquartile range of b. the mean of b is greater than the mean of a.

D for plato users

Step-by-step explanation:

b. astronomers

introduction, methodology, results, discussion

step-by-step explanation:

an observational study is one which consists of actual observation to record data and then analyse the data.

there are a number of factors that should be analyzed before starting an observational study.

the main four factors are:

i) introduction:   this should be analysed to check whether the purpose of the study is correctly established and the data recorded are appropriate for the study

methodology:   the method of collecting the data, such as whether randomly selected, and whether sample size matches with the population to be studied, whether questions asked are easy to answer by common men, etc.

results: then results such as summary of data with comments should be studied thoroughly

discussion:   the last is the discussion, this can be either by management people or persons who are all interested , etc.