Question

• A sports psychologist hypothesized that spacing out practice of free throws would result in a different free throw accuracy than practicing free throws all at once. He randomly assigned 30 basketball players to either a spaced practice or concentrated practice condition, with 15 players in each condition. The spaced players practiced free throws for 15 minutes each day for 4 consecutive days; the concentrated players practiced one day for 60 minutes. On the following day he obtained each player's percentage correct from 10 free throws. The spreadsheet shows the results.

Subject ID	% Correct Spaced Practice	% Correct for Concentrated Practice
1	60	40
2	80	60
3	60	50
4	70	40
5	40	80
6	50	70
7	50	60
8	70	50
9	70	40
10	60	50
11	80	60
12	70	50
13	60	30
14	50	70
15	80	50
Means	63.333	53.333
M1-M2	10.000
Stdev	12.344	13.452
MSE	166.667
SM1-M2	4.714
t	2.121
t.test	0.043
t.inv	2.121

QUESTION 2

Given Problem 5, how many pairwise comparisons are possible?

		a) 15
		b) 5
		c) 50
		d) 25

QUESTION 6

If you randomly selected 3 marbles without replacement from a jar containing 5 green marbles and 3 brown marbles and recorded the number of green marbles you obtained, and then repeated this experiment many times you would expect the distribution of numbers of green marbles to follow a

		a) sampling distribution
		b) normal distribution
		c) hypergeometric distribution
		d) binomial distribution

QUESTION 8

Let's say that you randomly throw a die (6 sided cube with 1 to 6 spots showing on each side). What is the probability of getting a 1 spot or a 2 spot?

		a) 0.333
		b) 0.1667
		c) 0.25
		d) 0.5

QUESTION 9

For which of the following activities could probabilities be computed using a binomial distribution?

		a) throwing a die one hundred times
		b) flipping a coin a 100 times
		c) grades earned by 100 students on a statistics final exam
		d) the probability of getting a heart while playing card games

Answer 1