1 foot 2 feet 0 1 0 1 0 1 0 1 1 1 1 1 1 1 1 1 2 2 2 2 3 3 3 3 0 1 EXPERIMENT 1 I

Question

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EXPERIMENT 1

In class one day last semester, I randomly assigned students to one of two groups as they came into class. The first person into the room was assigned to group 1, the second person to group 2, the third to group 1, and so on. Members of the first group stood on one foot and members of the second group stood on two feet, all while tossing a ball into a wastebasket positioned 5 feet away. The number of baskets each participant made out of 3 attempts is listed in the table.

1) State your statistical hypotheses:

            HA:

H0:

2) Give the M and SD for each group.

1 foot

2 feet

Mean

SD

3) What is the experimental design of experiment 1? What kinds of samples were used?

4) Using SPSS compute the appropriate statistical test. With alpha set at .05, write a conclusion of the findings. Be sure to report the appropriate statistic in APA style.  

EXPERIMENT 2

This semester, I asked the class to line up in order from shortest to tallest. Each student in a pair was then randomly assigned to one of two groups. Members of the first group stood on one foot and members of the second group stood on two feet while tossing a ball into a wastebasket positioned 5 feet away. The number of baskets each participant made just happened to be identical to the number of baskets the participants made last semester. In other words, use the same data set you used in Experiment 1.

1) State your statistical hypotheses:

            HA:

H0:

2) Give the M and SD for each group.

1 foot

2 feet

Mean

SD

3) Do the M and SD for experiment 2 differ from those found in experiment 1?

4) What is the experimental design of experiment 2? What kinds of samples were used?

4) Using SPSS compute the appropriate statistical test. With alpha set at .05, write a conclusion of the findings. Be sure to report the appropriate statistic in APA style.  

  

5) Compare experiment 1 with experiment 2.

Experiment 1

Experiment 2

What are the t-obtained values?

What are the degrees of freedom?

What are the t-critical values?

What are the significance levels?

6) Which study is more powerful? Why did one experiment turn out significant and not the other when both use the same data?

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Explanation / Answer

Experiment 1

1 ) Ho: The average number of baskets by participant made out of 3 attempts on feet1 is equal is feet2 .

Vs

HA: The average number of  baskets by participant made out of 3 attempts onfeet1 is equal not feet2 .

2)

c)Completely Randomized design was used here becauseonly randomization and replication principles of design are used here. Here random samples are used

d)

Experiment 2

1)

1 ) Ho: There is no significant difference between average number of baskets by participant made out of 3 attempts on feet1 and on feet2 .

Vs

HA: There is no significant difference between average number of baskets by participant made out of 3 attempts on feet1 and on feet2 . .

2)

c) Mean and SD are same

d) Randomized block design is used as a student acts as block .Paired samples are taken

1

Mean SD Group1 1.076923 1.071414 Group2 1.461538 0.745797

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