QUESTIONS

1- How is the coefficient of variation computed?

2- A sample of 186 randomly selected students, found that the proportion of students planning to travel home for thanksgiving is 0.74. What is the standard deviation of the sampling distribution? ( round to 3decimal digits).

3- Increasing the size of a sample widens the distribution of the sample statistic. True or false.

4- Whether the distribution of the mean of a large number of independent, identically distributed variables will be approximately normal depends on the underlying distribution. True or false?

5- For a normal distribution with a man of 298 and a standard deviation of 43, what is the Z value for a random value to be 267? ( Use 2 decimal digits).

6- Let's assume we know that 1% of adult over the age of 60 have lung cancer, that 90% off adults who have lung cancer will test positive ( called a true positive), and that 8% percent of adults that do not have lung cancer will also test positive ( called a false positive).

What is the probability of actually having lung cancer if an adult tests positive for lung cancer?

7- What is the probability that you will throw boxcars ( two 6's) with one throw using 2 dice ?

8- If you toss a die twice, what is the probability that the total is none {4,6,9}?

9- If you toss a die twice, what is the sample space if you want to restrict the results to only the outcomes where adding the results of the two throws together equals seven? For example, if you get 1 on the first toss and 6 on the second toss, these two tosses meet the criteria.