Practice: The average age of people in the United States is 32 with a standard deviation of 20. If a random sample of 100 people were selected, what is the probability that the sample average age is greater than 36?

Concept #1: Sampling Distributions

Concept #2: Probabilities Associated with Sampling Distributions for a Sample Mean

Concept #3: Probabilities Associated with Sampling Distributions for a Sample Mean: Intro

Practice: The average age of people in the United States is 32 with a standard deviation of 20. If a random sample of 100 people were selected, what is the probability that the sample average age is greater than 36?

Practice: Referring to Practice 1, if a random sample of 400 people were selected, what is the probability that the sample average age is greater than 36?

Practice: Referring to Practice 1 and 2, why is the probability of finding a sample average of greater than 36 different?

Practice: The Double Whopper is a big seller in Burger King. The average and standard deviation for the number of calories in the Double Whopper are 850 and 100 respectively. If you randomly selected 64 sandwiches, what is the probability that you find a sample average of greater than 900 calories?

Practice: The Big Mac is the biggest competition to Burger King?s Whopper. The average calorie count for the Big Mac is 920 with a standard deviation of 64. What is the probability that a randomly selected 64 sandwiches would give you anaverage between 910 and 925 calories?