Every cereal box has a gift inside, but you cannot tell from the outside what the gift is. The store manager assures you that 16 of the 65 boxes on the shelf have the secret decoder ring. The other 49 boxes on the shelf have a different gift inside. If you randomly select two boxes of cereal from the shelf to purchase, what is the probability that BOTH of them have the secret decoder ring?

0.06059

Step-by-step explanation:

Total Number of Trial=65

Number of Boxes with Secret Decoder Rings =16

Relative Frequency of Getting a Decoder Ring= 16/65

If 2 boxes are randomly selected, the Probability that BOTH have the secret decoder ring

= P(1st box has the ring AND the 2nd box has the ring)

= 16/65 X 16/65

=0.06059171598

= 0.06059 (to 4 significant figures)

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.