introduction, methodology, results, discussion
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.
2. angles qrt and qst both measures 156 degrees.
we have been given a diagram of a circle and we are told that measure of arc qvt is 156 degrees.
we can see from our given diagram that angle qrt and angle qst subtends to arc qvt.
since we know that angles subtended by the same arc at the circumference are always equal.
by angle subtended by same arc theorem, measure of angle qrt and angle qst will be equal to the measure of arc qvt.
therefore, angles qrt and qst both measures 156 degrees and 2nd statement is the correct choice.
twenty-six miles over two gallons because the proportion for the original 13 miles to one gallon would be written 13/1 and, doing the same thing to the top and bottom, i multiplied by 2 and got 26/2