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Statistics often is concerned with estimating the center of a distribution by using the mean, median, and sometimes the mode. Describe a real-world example in which one measure of central tendency provides useful information while another measure of central tendency provides meaningless (or even misleading) information. Also explain which of the three measures of central tendency would be appropriate, for this example, and why. Identify what you think is the best measure of variability to use for your example and explain why you believe it to be better than the others.
11 women and 9 men are the contestant in a competition. If 3 winners are ramdomly selected. what is the probability that they are all men?
Using your answers to the earlier parts of this question, explain how the sample size affects the mean and SD of the sum of a collection of random variables. Limit your answer to 2-3 sentences.
Can you provide some pros and cons of using descriptive and inferential statistics to make managerial decisions.
The data below show the average daily high temperature for Chicago, Illinois, for twelve recent spring and summer months. Create a stem-and -leaf diagram for the data.
Is it true that one of the important properties of time series models is that some sort of pattern in the data over time should be detected first and then used within the model?
Thirty accidents of these vans were examined, and 11 vans had rolled over. Test the claim that the proportion of rollovers exceeds.
A random sample of 12 paired observations indicated a correlation of .32. Can we conclude that the correlation in the population is greater than zero? Use the .05 significance level.
Do you think it would be justified for people of certain racial or ethnic groups to be subject to additional security checks at airport check points?
Compute the 95% confidence interval for the population proportion of registered voters who favor the slow growth initiative.
The caffeine content of 20 brands of regular coffee is shown below. 80 82 89 85 87 30 33 44 40 46 50 55 60 62 71 90 92 75 63 65. Thus, this job helps to construct a Frequency Distribution with a class interval of 10, starting with 30.
The airline must sell 150 seats to break even on this particular flight. On what percent of the flights does the airline make money?
Craft one page brief of the statistical results (include any additional pages needed for any APA tables or graphs and the SPSS syntax and output) in which you do the following:
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