{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

hw4 - 25.3 and the 95 confidence interval is(19.6 31.0 1...

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Homework 4 13 points You can use SPSS or the calculation tool on IntroStats to obtain any information (mean, SD, etc.) you may need. However, please attach any output you obtain from SPSS or write down any values you calculate from IntroStats to get full credit. Problems from Howell : Ch 12: 16; Ch 14: 12 (2 points each) Problems from Williams (Introstats.net): Ch 9: 1, 2, 4 (2 points each) You are interested in the level of depression in long-time smokers. You randomly selected a sample of 12 people who have smoked at least a pack every day for the last 10 years, and administered the Beck Depression Inventory. The mean of your sample is
Image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 25.3, and the 95% confidence interval is (19.6, 31.0). 1. The cut-off point used by clinical psychologists to indicate a moderate level of depression is 20. Based on the 95% confidence interval, do you have evidence to suggest that long-term smokers show a moderately elevated level of depression? How can you tell? (1 point) 2. If you increased the confidence level from 95% to 99%, what would happen to the confidence interval? Why? (1 point) 3. If you increased the sample size and the mean and sample standard deviation remained the same, what would happen to the 95% confidence interval? Why? (1 point)...
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    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.

    Student Picture

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

  • Left Quote Icon

    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.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    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.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern