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Now you'll apply your new inferential stats skills to the class survey. As part of the survey, you completed a few questions about your level of happiness. You responded using a Likert scale from 1 (not happy) to 5 (very happy). The key variable of interest is Mean Happiness - it is near the end of the data set. Suppose the national average for happiness among college students in the country is μ = 2.95 but we hypothesize that students at QU will report a higher level of happiness than the population of college students.
Based on your reading of the above scenario, which statistical test (that is, a single-sample z test or a single-sample t test) should we conduct to test this hypothesis? Also, list one of the assumptions of this test.
Teen smoking. The Centers for Disease Control say that about 30% of high-school students smoke tobacco (down from a high of 38% in 1997).
a politician claims that she will receive 65 of the vote in an upcoming election. the results of a properly designed
Compute the mean, variance, and standard deviation of the overseas bond yields as of March 6, 2009.
Gallup World. At its Web site (www.gallupworldpoll .com) the Gallup World Poll describes their methods.
find the number of possible 4-letter sequences (words) where the same letter can appear in the word more than once.
The following scoring model has been developed to inform managers on the choice of new location. A number of factors have been identified as important and these have been weighted.
Factor the polynomial completely. Factor each completely given that the binomial following it is a factor of the polynomial.
Taking air samples at random times during a 2-month period, an environmental group finds the standard deviation of ozone concentration measurements in the vicinity of a chemical plant to be 0.03 parts per million (ppm).
What is the probability that a randomly selected group of 50 shoppers will spend a total of more than $5700? The total will be more than $5700 when the sample average exceeds what value?
What is the probability that exactly 5 cars will arrive in a given hour and what is the probability that at least 3 cars arrive in a given hour ?
Using any linear programming software, solve the problem for the optimal answer and provide the value of the objective function and the variables at optimality. Provide a copy of your linear programming output. In addition to providing this output..
Use the MATLAB randn function to create a Gaussian distributed random variable Y .- Find an analytical model that seems to fit your estimated PDF.
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