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Within each of your current careers/ jobs, there are sets of data that can be analyzed. For example, a teacher can use a set of test scores, a dietician can analyze a set of patient weights and correlate them to incidences of diabetes, and a salesperson can look at their clients' previous buying behavior to focus marketing. Your job this week is to think of a set of data that is important to to your current work environment (and a student can count as a work environment). Your data set should be useful and should include have at least 20 numbers in the set. With that set, perform the following operations:
* find the mean, median, mode, and range.
* find the variance, standard deviation and margin of error.
* construct a 95% and 99% confidence interval.
* analyze your statistics to see what types of conclusions you can draw.
The 90% confidence interval to estimate the true average difference in nationwide sales quantity before the ad campaign and after is (0.39, 16.64). Which of the following is the appropriate conclusion? The differences were calculated as (after ad ..
A student must choose one of the subjects, art, geology, or psychology, as an elective. She is equally likely to choose art or psychology and twice as likely to choose geology.
A random sample of 77 eighth grade students' scores on a nation mathematics assessment test has a mean score of 278 with a standard deviation of 31.
Discuss the assumptions of this model. Specifically, how does each variable affect demand? How do the variables influence each other? What limitations might this model have? How can it be improved?
Define validity and reliability. How can we insure our data is both reliable and valid? Which of these two do you think is the more important?
Write complete linear programming model (All three parts) to find out the number of items to be transported from models A, B, C, and D to nodes 1 and 2 at minimum cost.
A psychologist has designed a questionnaire to measure individuals' aggressiveness. Assume that the scores on the questionnaire are normally distributed with a standard deviation of 80.
The random variable x, which is the number of occurrences of an event over an interval of ten minutes. It can be assumed that the probability of an occurrence is the same in any two time periods of an equal length. It is known that the mean number..
What is the probability that none are a commercial success?
Assuming the percentages are based on independant simple random samples of 1,000 first year college students drawn each year.
What is the value of the mean square for error (the "within groups" mean square that would be reported in the ANOVA test, and what is the value of the mean square for treatments (the "between groups" mean sqaure) that would be reported in the ANOVA ..
Of 260 females, 224 answered yes. Construct a contingency table to evaluate the probabilities. What is the probability that a respondent chosen at random:
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