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STATISTICS Exam I Ch. 1-3 various
Define "Statistics", 5 suggestions for the cover letter, and formulas.
Terms in this set (10)
A Branch of Mathematics dealing with the collection, analysis, interpretation, and presentation of data. Uses: making estimations and projections. We have to carefully choose our sources to ensure reliable data.
Suggestions for the Cover Letter
The cover letter sells the survey. Have a warm friendly tone (I guess), appeal to the cooperative nature of people. Let them know that their response is needed to improve the survey. Somehow state the purpose of the survey (what are we trying to accomplish). Show how the survey will help the respondents or society. Once again, keep it short while communicating something important. Maybe you could offer a gift to induce responses.
population ΣX / N or Σx / n. "X" is the items or score. "N" is the number of items "x".
The number whose value is in the middle. If it's even, then you need to average out the two middle numbers.
The number that occurs the most frequently (it is possible to have a multi-modal problem).
The difference between the highest and the lowest number. H-L.
sqrt [Σ(x-M)^2/N. Or on your calculator, Shift and the "8" key, after you've computed the average. M (mean, N (number)
Coefficient of Variation
Standard Deviation (Sigma x n)/ M (mean).
Σ(wx)/Σw. W= credit hours, x=grade. Those are examples, not the definitions.
Mean from Grouped Data
Σfm/n. The "n" is the sum of the frequency. "f" is frequency. "m" is midpoint.
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