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The article "So Close, Yet So Far: Predictors of Attrition in College Seniors" (Journal of College Student Development [1998]: 343-348) examined the reasons that college seniors leave their college programs before graduating. Forty-two college seniors at a large public university who dropped out before graduation were interviewed and asked the main reason for discontinuing enrollment at the university. Data consistent with that given in the article are summarized in the following frequency distribution:
Reason for Leaving the University Frequency
Academic problems 7
Poor advising or teaching 3
a. Do you think this is an effective use of a pie chart? Why or why not?
b. Construct a bar chart to show the distribution of deaths by object struck. Is this display more effective than the pie chart in summarizing this data set? Explain.
Determine the point estimate, and then construct the 95% confidence interval for μ1= the average attitude toward Manhattan. Repeat part (a) for μ2 through μ5, the average attitudes toward Brooklyn, Queens, The Bronx and Staten Island, respectively
i) Show that these r.v.'s are independent; ii) Calculate the probability P(X1 X2 X3).
What factors should the assistant chief consider in determining the presence of gender bias in firefighter promotion? Is the promotional status of recently promoted firefighters independent of their gender
Use both of these facilities regularly. Given that a randomly selected member uses the tennis courts regularly, find the probability that they also use the golf course regularly.
question over a period of years a toothpaste has received a mean rating of 5.9 on a 7-pointscalefor overall customer
The cholesterol concentration in the yolks of each of a sample of 22 randomly selected eggs laid by free range chickens were found to have a mean value of 9.38 mg/g of yolk and a standard deviation of 1.62 mg/g.
a two-sample t test is going to be carried out where it is assumed that the population variances are unknown but
prepare a 2 slide microsoft powerpoint presentation with speaker notes how to use a z-test to test the null hypothesis
Provide a brief description of the main features of these data from the scatter plot and Describe why you would use performance as the predictor variable and performane related pay as the dependent variable in such a model.
Find out the confidence interval for the population mean also interpret the result. A researcher is interested in whether social assertiveness might be influenced by training procedures.
Identify the null hypothesis, alternative hypothesis, test statistic, p-value or critical value, and the conclusion about the null hypothesis. Use the P-value method.
Analyze whether the factors of totwrk, educ, and age are enough factors to explain the variation in sleep. Explain which additional factors should be explored in order to explain the variation in sleep. Provide your reasoning.
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