Below you are given ages that were obtained by taking a random sample of 9 undergraduate students. Assume the population has a normal distribution. 40 42 43 39 37 39
a. What is the point estimate of ??
b. Determine the standard deviation.
c. Construct a 90% confidence interval for the average age of undergraduate students.
d. Construct a 99% confidence interval for the average age of undergraduate students.
e. Discuss why the 99% and 90% confidence intervals are different.
a. 40
b. 2.19
c. 38.20 to 41.80 (rounded)
d. 36.39 to 43.60 (rounded)
e. As the level of confidence increases, the confidence interval gets wider.
You might also like to view...
________ are customers who are completely satisfied, have high loyalty, and are very supportive of the company
A) Loyalist/Apostle B) Defector/Terrorist C) Mercenary D) Hostage
In an electronic data interchange environment, the audit trail
a. is a printout of all incoming and outgoing transactions b. is an electronic log of all transactions received, translated, and processed by the system c. is a computer resource authority table d. consists of pointers and indexes within the database
Bella is in line for a promotion. Andy told Bella that she would get the promotion even though he knew that he was giving it to Ryan. Andy wanted Bella to think that he appreciated her, and therefore manipulated her into staying with the company. By telling her that the promotion was out of his control, he felt she would stay. Andy has displayed
a. High levels of Risk taking propensity b. High levels of Machiavellianism c. High levels of Type B orientation d. Low levels of Type C orientation
Small company stocks have historically had higher average annual returns than large company
stocks, and also a higher risk premium. Indicate whether the statement is true or false