A study by Allstate Insurance Co. finds that 82% of teenagers have used cell phones while driving (the Wall Street Journal, May 5, 2010). Suppose a random sample of 100 teen drivers is taken. True or False: The sampling distribution of the sample proportion is approximately normal.

Last year, the typical college student graduated with $27,300 in debt (The Boston Globe, May 27, 2012). Let debt among recent college graduates be normally distributed with a standard deviation of $6,000.What is the probability that the average debt of two recent college graduates is more than $33,000? 

A random sample of size n = 80 is taken from a population with mean μ = -15.2 and standard deviation σ = 5.Calculate the standard error for the sampling distribution of the sample mean. 

Select true for 1 extra credit point.

A random sample of size n = 66 is taken from a population with mean μ = -12.5 and standard deviation σ =6.What is the probability that the sample mean is less than -13? 

According to a recent survey, high school girls average 100 text messages daily (The Boston Globe, April 21, 2010). Assume the population standard deviation is 20 text messages. Suppose a random sample of 50 high school girls is taken.What is the probability that the sample mean is between 95 and 105? 

According to a survey, high school girls average 100 text messages daily (The Boston Globe, April 21, 2010). Assume the population standard deviation is 20 text messages. Suppose a random sample of 50 high school girls is taken.What is the probability that the sample mean is more than 105?  (Hint: read the rounding instructions at the top of the page)

Which Groups on the Periodic Chart are diamagnetic?

The Deuteronomic Code

During their migration from Mesopotamia to Egypt, the Hebrew tribe began to call themselves