In a survey of 3474 adults aged 57 through 85​ years, it was found that 88.3​% of them used at least one prescription medication. Complete parts​ (a) through​ (c) below. a. How many of the 3474 subjects used at least one prescription​ medication?

Step-by-step explanation:

(1)  Find alpha (α) = 10%  or 0.10

(2)  Find (α/2) = 5% or 0.05

(3)  Subtract 0.05 from 1.0000 to get 0.9500

So the interval of a 90% confidence interval is from 0.0500 < p < 0.9500

Find zα/2 at 0.9500 from z-score normal distribution table yielding z = 1.65

Using z-values →    -1.65 < z < 1.65

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.

1/800 is the right answer