The number of dvds in a random person’s home collection is counted for a sample population of 80 people. the mean of the sample is 52 movies; the entire population is known to have a standard deviation of 12 movies. assuming a 99% confidence level, find the margin of error.

Step-by-step explanation:

The formula to find the error is:

Where:

is the standard deviation

n is the sample size

So

n = 80 people

= 12 movies

Then

= confidence level = 0.99

We look for the Z value:

 Looking in the normal standard tables

Therefore:

if you are saying purchasing 3 social media ads and one newspaper ad counts as one purchase then there are:

6 purchases

if you are asking how many of each then:

18 social media ads

6 newspaper ads