2. A psychologist studying the human factors of computer keyboards set up an experiment to compare...

2. A psychologist studying the human factors of computer keyboards set up an experiment to compare two different keyboard designs. He measures the number of words per minute typed by one randomly selected group on Keyboard A and then he measures the number of words typed per minute by another randomly selected group of people on Keyboard B. Use the data below to determine if the typing speeds on the two different keyboards are significantly different.

Keyboard A (words per minute)	Keyboard B (words per minute)
47,51,54,62,44,51,48,65,42,44,71,68	68,39,52,33,55,58,67,62,61,49,44,49

A. What type of analysis will be appropriate for this data? Why? (2 points)

B. Calculate the summary statistics and check assumptions. (4 points)

C. Perform the appropriate hypothesis test showing all steps. (10 points)

D. Verify your conclusion in part C by building a 95% confidence interval for the difference of the means. (4 points)

Expert Solution

orchestra answered 2 years ago

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