statistics questions 524
—-Original copy attached—
- A cognitive psychologist was interested in the ability to solve puzzles.He selected 24 college sophomores and matched them on the basis of IQ and assigned, in groups of four, to one of four puzzle conditions (six blocks of four).He wants to make sure that all the puzzles are equally difficult.The dependent variable was the amount of time it took for a subject to complete the puzzle.The data are presented below.Were there differences in puzzle difficulty at the .05 level?
|
Puzzle |
||||
|
Block |
1 |
2 |
3 |
4 |
|
1 |
23 |
34 |
31 |
40 |
|
2 |
25 |
38 |
36 |
37 |
|
3 |
27 |
33 |
30 |
32 |
|
4 |
28 |
32 |
41 |
38 |
|
5 |
25 |
36 |
39 |
46 |
|
6 |
22 |
34 |
40 |
39 |
2.Andrzejewski, Spencer, Kelley, and Berridge trained 8 rats in a signal detection procedure.That is, the rats had to respond on two levers (left or right) signifying whether they had just seen a tiny green light or not.Prior to test sessions, each of the rats was given a drug injection.The dependent variable was the percentage of trials in which they responded correctly.
|
Drug |
|||||
|
Rat |
Saline |
0.1mg/kg Amphetamine |
0.25 mg/kg Amphetamine |
0.5 mg/kg Ritalin |
1.0mg/kg Ritalin |
|
1 |
84% |
84% |
84% |
88% |
88% |
|
2 |
90% |
90% |
90% |
88% |
91% |
|
3 |
84% |
83% |
94% |
89% |
89% |
|
4 |
92% |
92% |
87% |
94% |
90% |
|
5 |
92% |
93% |
97% |
96% |
92% |
|
6 |
88% |
78% |
88% |
90% |
93% |
|
7 |
88% |
88% |
94% |
94% |
94% |
|
8 |
80% |
82% |
87% |
83% |
82% |
The researchers hypothesized that since amphetamine and Ritalin are used therapeutically to improve attention in humans, it might improve signal detection in rats.What would you conclude?
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