15 people fit comfortably in a 6 feet by 6 feet area. use this value to estimate the size of a crowd that is 7 feet deep on both sides of the street along a 2-mile section of a parade route.

Step-by-step explanation:

1. Area of the crowd

The crowd fills a rectangle that is 2 mi long and 7 ft wide.

(a) Convert miles to feet.

(b) Calculate the area

A  = lw = 10 560 ft × 7 ft = 73 920 ft²

2. Size of crowd

15 people occupy an area of 6 ft × 6 ft = 36 ft²

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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.