SolutionsTo343-02#1Sp05-1

# SolutionsTo343-02#1Sp05-1 - Solutions CIS 343-02 Exam#1...

This preview shows pages 1–2. Sign up to view the full content.

Solutions CIS 343-02 Exam #1 Spring 2005 T or F 1. A 95% confidence interval is wider than a 90% confidence interval. Ans. = True T or F 2. A poll cannot have both selection bias and non response bias at the same time. Ans. = False 4. On the normal curve Find the area a) between -.33 and 1.33 Ans. = .9082 - .3707 = .5375 b) to the right of -1.49 Ans. = .9319 = area to left of 1.49 Find z if the area c) to the left of z is .5438 Ans. z=.11, area to the left is bigger than .5 means z is positive, finding .5432 in the body of the z table gives z=.11 d) to the right of z is .1788 Ans. z=.92, area to the right is less than .5 means z is positive, finding 1-.1788 = .8212 in the body of the z table gives z=.92 6. The weatherman wants to find a confidence interval for how often it rains in Murray during the month of March. The standard deviation for how often it rains in March is 3 times for the month. In a sample, over the last 10 years, of the last 10 Marches it rained on average 9 times per month. Find a 80% confidence interval.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern