# Chp 10

Powerful Essays
988 Words
Grammar
Plagiarism
Writing
Score
Chp 10
CHAPTER 10 – 14.1 REVIEW
For each number, determine the type of inference, state the assumptions, and answer the questions.

1. A random survey of 57 students was conducted to compare juniors and seniors employment status. Seven out of 18 juniors held a job while 16 out of 39 seniors held a job. (a) Find and interpret a 98% confidence interval. (b) Is there evidence at the 1% significance level that more seniors have a job than juniors? If so, what might explain this?

2. Cocaine addicts need cocaine to feel any pleasure, so perhaps giving them an antidepressant drug will help. A three-year study with 72 chronic cocaine users compared an antidepressant drug called desipramine against lithium (a standard drug to treat cocaine addiction), and of course a placebo as well. The subjects were randomly assigned to receive each treatment. Here are the results:

| | Cocaine Relapse? | Group | Treatment | Yes | No | 1 | Desipramine | 10 | 14 | 2 | Lithium | 18 | 6 | 3 | Placebo | 20 | 4 |

(a) Make a graph to compare the rates of cocaine relapse for the three treatments. Describe what you see. (b) Is there a relationship between Treatment and Cocaine Relapse?

3. A random study of 25 people on whether fidgeting and other “non-exercise activity” (NEA) can explain why some people don’t gain weight when they overeat was done. Output for this study is shown below.

Regression Analysis: Fat gain versus NEA change | Predictor | Coef | SE Coef | T | P | Constant | 3.5051 | 0.3036 | 11.54 | 0.0003 | NEA change | -0.065 | 0.014 | | | s = 0.75 | R-Sq = 92.5% | R-Sq(adj) = 95.6% |

(a) Explain what s = 0.75 means. (b) Find and interpret a 90% confidence interval for the slope of the regression line. (c) Does a linear relationship exist between fidgeting and NEA change?

4. A statistics student wants to compare the mean times needed to access flight information for two major

## You May Also Find These Documents Helpful

• Satisfactory Essays

Running head: UNIT 5 INDIVIDUAL PROJECT BUSN311 by Barbara Ryals Quantitative Methods and Analysis Irene Tsapara November 7, 2010 Benefits | Intrinsic | | | | | | | | | 1.4 | 5.5 | correl | | | | | | | | 5.4 | 5.5 | 0.209015 | | | | | | | | 6.2 | 5.2 | | | | | | | | | 2.3 | 5.3 | SUMMARY OUTPUT | | | | | | | 4.5 | 4.7 | | | | | | | | | 5.4 | 5.5 | Regression Statistics | | | | | | | 6.2 | 5.2 | Multiple R | 0.209015 | | | | | | | 2.3 | 5.3 | R Square | 0.043687 | | | | | | | 4.5 | 4.7 | Adjusted R Square | 0.009533 | | | | | | | 5.4 | 5.4 | Standard Error | 0.396714 | | Intrinsic is higher | | | | 6.2 | 6.2 | Observations | 30 | | |…

• 1291 Words
• 6 Pages
Satisfactory Essays
• Satisfactory Essays

4. Question : A federal bank examiner is interested in estimating the mean outstanding defaulted loans balance of all defaulted loans over the last three years. A random sample of 20 defaulted loans yielded a mean of \$67,918 with a standard deviation of \$16,552.40. Calculate a 90% confidence interval for the mean balance of defaulted loans over the past three…

• 904 Words
• 4 Pages
Satisfactory Essays
• Good Essays

Sixteen coins were tossed nine times and the number of heads was counted to determine variation associated with random events.…

• 986 Words
• 4 Pages
Good Essays
• Powerful Essays

b. Explain, to a person who has never had a course in statistics, what you have done.…

• 1095 Words
• 6 Pages
Powerful Essays
• Satisfactory Essays

b) Give your answer in standard form to an appropriate number of significant figures (M1)…

• 484 Words
• 2 Pages
Satisfactory Essays
• Good Essays

1. To what extent was industrialization responsible for the deplorable conditions of the cities in the early 19th century?…

• 1216 Words
• 5 Pages
Good Essays
• Satisfactory Essays

Cocaine is used in several ways. It can be snorted, injected, and smoked (Drug Fact Sheet: Cocaine, 2012). This drug has different effects based on the method of abuse. It causes raised blood pressure, lack of appetite, insomnia, and sometimes paranoia (Drug Fact Sheet: Cocaine, 2012). This article gives the facts about cocaine, its uses, how it is abused, and background information.…

• 284 Words
• 2 Pages
Satisfactory Essays
• Powerful Essays

Wahshton, A. M. (1988). Cocaine addiction: Treatment, recovery, and relapse prevention. New York: W. W. Norton.…

• 1074 Words
• 4 Pages
Powerful Essays
• Powerful Essays

McDonough, Michael, and Andy Cinko. "Elderly Workers Overtake Teens in Job Search."Bloomberg.com. Bloomberg, 12 July 2010. Web. 15 Jan. 2013.…

• 2240 Words
• 9 Pages
Powerful Essays
• Good Essays

d. Evaluate the model by testing the slope coefficient to see if there is a relationship at the 5%…

• 766 Words
• 4 Pages
Good Essays
• Good Essays

Criterion A:My personal project is the effects of cocaine and how it can affect your daily lifestyle…

• 1509 Words
• 7 Pages
Good Essays
• Powerful Essays

## ch09

• 1163 Words
• 8 Pages

9.2 In a _______ swap, two parties exchange floating interest payments based on different reference rates.…

• 1163 Words
• 8 Pages
Powerful Essays
• Satisfactory Essays

b. Let selling price be the dependent variable and distance from the center of the city the independent variable. Determine the regression equation. Estimate the selling price of a home 20 miles from the center of the city. Determine the 95 percent confidence interval and the 95 percent prediction interval for homes 20 miles from the center of the…

• 451 Words
• 2 Pages
Satisfactory Essays
• Satisfactory Essays

Compare the guidelines for preparing flowcharts and DFDs. What general design principles and limitations are common to both documentation techniques?…

• 322 Words
• 2 Pages
Satisfactory Essays
• Satisfactory Essays

Average Hourly Earnings in 2004 Mean AHEHS,2004 − AHEHS,1992 AHECol,2004 − AHECol,1992 Col–HS Gap (1992) Col–HS Gap (2004) Gap2004 − Gap1992 0.33 1.24 SE(Mean) 0.137 0.217 95% Confidence Interval 0.06−0.60 0.82−1.66…

• 17135 Words
• 69 Pages
Satisfactory Essays