Question

How do you know what functions to use on your calculator when looking at study problems? For example:

A nationwide study indicated that 80% of college students with cell phones send and receive
text messages with cell phones. A simple random sample of n = 200 college students with cell phones is
obtained.
(a) Describe the sampling distribution of ˆp, the sample proportion of college students with cell phones
who send or receive text messages with their cell phones. [Hint: shape, center, and spread]

(b) What is the probability that 172 or more college students with cell phones send and receive text
messages? Is this result unusual?

In regards to functions on the calculator, normalcdf, inversenorm, etc. which one do you know what to use? The study Q&As are great but are typically showing looking at a normal distribution chart. My professor wants us to know how to use each function on a TI-84 Plus CE.

Answer 1