David moved from a house that is 89 miles away from his workplace
to a house that is 51 miles away from his workplace. What is the percent
decrease in the distance from his home to his workplace?

43%

Step-by-step explanation:

Old house: 89 miles away.

New house: 51 miles away.

Let 100 be 100% of 89, x our new percentage of 51.

So, if 57% is 51 miles, substract 57 from 100.

100-57=43% This is the decrease.

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.