Some researchers claim there is an association between taking vitamins and gaining weight. They took a random sample of people
living in Boston, Massachusetts, and recorded whether they took vitamins and whether they gained weight. The results are shown in
the following two-way table:
Has Gained Weight Has Not Gained Weight
Does not take vitamins
Takes one vitamin per day
Takes more than one vitamin per day 72
If a person is chosen at random, what is the probability that he or she has gained weight, given that he or she takes more than one
vitamin per day?
0.42
0.45
0.47
0.50

Why was Richard Nixon going to be impeached? Do you agree/disagree with Gerald Ford who issued a presidential pardon for Nixon? Briefly explain why.

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.

3

step-by-step explanation:

in standard form:

a= dictionaries

b= maps

you have to buy 3 dictionaries, so put a 3 next to the a (dictionaries) so that you can multiply them by each other.

a3+b= 60 (the amount of money you have)

we already know the cost of a=15 so replace a with $15

($15 x 3)+b=60

multiply 15 and 3 to get $45 and replace it with $45

45+b=60

and then replace b with 15 to get the total:

45+15=60

that means you have $15 left after buying 3 dictionaries.

15 divided by the cost of a map ($5) equals 3.

so you can buy 3 maps.

sorry if it was confusing!