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To compare three brands of computer keyboards, four data entry specialists were randomly selected. Each specialist used all three keyboards to enter the same kind of text material for 10 minutes, and the number of words entered per minute was recorded. The data obtained are given in the table below. Using these data, SST = 392.6667, SSB = 143.54833, and SSE = 2.6667.
Keyboard Brand
Data Entry Specialist A B C
1 77 67 63
2 71 62 59
3 74 63 59
4 67 57 54
Use Tukey simultaneous 95 per cent confidence intervals to make pairwise comparisons of the keyboard brand effects on the mean number of words entered per minute. Which keyboard brand maximizes the mean number of words entered per minute?
Show how the Normal bin width rule can be modi ed if f is skewed or kurtotic. Examine the eff ect of bimodality. Compare your rules to Doane's (1976) extensions of Sturges' rule.
1. Recognize and explain the opportunities for statistical learning. 2. Describe how the use of statistics supports student learning. 3. Recognize appropriate data displays a
what do we mean by critical region
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programming
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