For each number, determine the type of inference, state the assumptions, and answer the questions. 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. Find and interpret a 98% confidence interval. Is there evidence at the 1% significance level that more seniors have a Job than Juniors? If so, what might explain this?
1.Cocaine addicts need cocaine to feel any pleasure, so perhaps giving them
2. An antidepressant drug will help.
A three-year study with 72 chronic cocaine users compared an antidepressant drug called despairing against lithium (a standard drug to treat cocaine addiction), and of course a placebo as well. The subje
...cts were randomly assigned to receive each treatment. Here are the results: I I Cocaine Relapse? I Group I Treatment I Yes I No I 1 | Despairing I 10114 1 2 | Lithium 118 16 1 3 | Placebo 120 14 1
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?
A random study of 25 people on whether fidgeting and other "non-exercise
3. Activity' (NEE) 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 NEE change I Predictor I Coffee I Scope IT IP I constant | 3. 5051 | 0. 3036 | 11. 54 | 0. 0003 | NEE change | -0. 065 | 0. 014 | s -0. 75
| R-sq I (a) Explain what s = 0. 75 meaner. Find and interpret a 90% confidence interval for the slope of the regression line. Does a linear relationship exist between fidgeting and NEE change?A statistics student wants to compare the mean times needed to access
4. Flight information for two major airlines. Thirty randomly selected students accessed one airline's "On-Time" Web site, and the time required to locate the flight information using that Web site had a mean of 2. 5 minutes and a standard deviation of 0. 8 minutes. Thirty different randomly selected students accessed the other airlines "Real-Time" Web site, and the time required to locate the flight information using the Web site had a mean of 2. 1 minutes and a standard deviation of 1. Find and interpret a 95% confidence interval. Minutes. Is there evidence that "On-Time" web site takes significantly longer than "Real-Time" web site in locating the flight information?
5. Charles Darwin, author of On the Origin of Species (1859), designed an experiment to compare the effects of cross-fertilization and self-fertilization on the size of plants. He planted pairs of very similar seedling plants, one self-fertilized and one cross- fertilized, in each of the 15 plots at the same time. After a period of time, Darwin measured the heights (in inches) of all the plants.
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