Use the following information to answer questions (11) and (12). Suppose that the probability

that a person books an airline ticket using an online travel website is 0.72.

11. What is the probability that exactly seven out of ten people used an online travel website when they booked their airline ticket?

12. What is the probability that no more than three out of ten people used an online website when they book their airline ticket?

Use the following information to answer question (13) and (14). In a recent poll of 1200

randomly selected adult office workers, 32% said they had worn a Halloween costume to the

office at least once.

13. What is the margin of error, using a 95% confidence level, for estimating the true population (percentage) of adult office workers who have worn a Halloween costume to the office at least once?

14. What is the 95% confidence interval for the proportion of all adult office workers who have worn a Halloween costume to the office at least oncce?

15. Suppose that the following is to be tested: Ho: p = 0.35 and Hi: p 0.35. Calculate the observed z-statistic for the following sample data: Forty out of eighty test subjects have the characteristic of interest. Assume p approximates a normal distribution and = 0.01. Is the null hypothesis rejected or failed to be rejected?

Use the following ordered paired data set to answer questions 16, 17, 18, 19, and 20.

x 35 45 52 66 76 81

y 1 4 10 20 26 39

16. Determine the Correlation Coefficient for the above ordered paired data set.

17. Determine the Coefficient of Determination.

18. How much of the relationship or association between x and y is due to random chance?

19. Use Linear Regression method to make a Linear Equation for this data.

20. Using your derived equation, what would be the expected value of y if x is equal to 65?