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:

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step-by-step explanation:

the diver is 33 feet below the surface.

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