The union of sets p = {5, 6, 7, 8, 9} q = {1, 2, 3, 4, 5} is given by which of the following? {1, 2, 3, 4, 5, 6, 7, 8, 9} {1, 2, 3, 4, 5, 5, 6, 7, 8, 9} ø {5}

First option.

Step-by-step explanation:

Given two sets A and B, the union (A∪B) will be the set of elements which belong to either A or to B or to both.

Inf this case you have these two sets:

{} and {}

To find the union of these sets, put together the elements of the set P and the elements of the set Q (you need  to remember that no element must be repeated).

Then, you get that the union of sets P and Q is:

∪{}

This matches with the first option.

i am thinking c. sorry if im wrong .

step-by-step explanation:

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.