Question

# please state in complete sentence A researcher studied three computer keyboard designs. Three samples of individuals...

A researcher studied three computer keyboard designs. Three samples of individuals were given material to type on a particular keyboard, and the number of errors committed by each participant was recorded. Are there significant differences in typing performance among the three keyboard designs?

Keyboard A       Keyboard B        Keyboard C
0          6                       6
4          8       5
0      5                       9
1                            4       4
0          2                       6

Q1: What is the SS between?
Q2: What is the df between?
Q3: What is the SS within?
Q4: What is the df within?

A psychologist would like to examine the effects of a new drug on the activity level of animals. Three samples of rats are selected with n = 4in each sample. One group gets no drug, one group gets a small dose, and the third group gets a large dose. The psychologist records the activity level for each animal. The data from this experiment are presented below. Test with alpha = .05. Do these data indicate any significant differences among the three groups? Conduct a hypothesis test.
Small            Low dose         Large dose
10             18               11
12           14               14
18           15               17
20             17               14
?̅=15           ?̅=16            ?̅=14

Q2: What is the df between?
Q3: What is the df within?
Q4: What is the cut-off point?
Q5: What is SS between?
Q6: What is SS within?
Q8: Write your conclusion in complete sentence.

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