# C it is 13 of the three possibilities one for each

• Test Prep
• 6
• 100% (8) 8 out of 8 people found this document helpful

This preview shows page 5 - 6 out of 6 pages.

c. It is 1/3: Of the three possibilities, one for each coin toss, two (all heads and all tails) don't fit the question. d. It is 2/4=1/2: you have either zero heads, or one, or two, or three. These four events are disjoint, with all equally likely. Two of the four (all heads or none) fit the question.
Question 18The law of large numbers states that as the number of observations drawn at random from a population with finite population mean µincreases, the sample mean ࠵?
µ
.
Question 19Consider the distribution of average number of hours that college students spend sleeping each weeknight. This distribution is very skewed to the right, with a mean of 5 and a standard deviation of 1. A researcher plans to take a simple random sample of 18 college students. If we were to imagine that we could take all possible random samples of size 18 from the population
6 of college students, the sampling distribution of average number of hours spent sleeping will have a shape that is Question 20 The heights of women are normally distributed with mean 66 inches and standard deviation of 3 inches. You choose a simple random sample of 9 women and average their heights. If you do this many times, the mean and standard deviation of the average scores you get will be close to
• • • 