Individual Assignment #11 - Which Team has Better Batters?

Started: Jul 8 at 5:46pm

Quiz Instructions

This assignment is related to your Chapter 11 (Salkind) material.Please save your responses to this assignment, as you will need them for your discussion assignment this week!

Instructions:Do you recall the assignment we did a few weeks ago when we calculated the standard deviation and variance for the runs scored for the 15 players on two baseball teams (for the Tampa Bay Rays and the Los Angeles Dodgers)? Well, let's revisit those data to figure out if there is a significant difference between the two teams. Here's the data again (note this is the same as the data from your Assignment #6---you might want to look back at that assignment to see your means, SDs, and Variance calculations to save yourself some time on this assignment!).

Rays

36

29

27

24

19

19

18

16

16

16

15

12

10

10

8

Dodgers

47

38

36

33

30

30

26

23

21

20

14

13

8

8

1

Flag question: Question 1

Question 1

0.5pts

What is the null hypothesis?

Group of answer choices

H0: the average runs scored by the Rays > the average runs scored by the Dodgers

H0: the Rays are the better team.

H0: the average runs scored by the Rays < the average runs scored by the Dodgers

H0: the average runs scored by the Rays = the average runs scored by the Dodgers

H0: the average runs scored by the Rays

the average runs scored by the Dodgers

Flag question: Question 2

Question 2

0.5pts

Select the alternative hypothesis

Group of answer choices

Ha: The Rays are better than the Dodgers

Ha:the average runs scored by the Rays

the average runs scored by the dodgers

Ha:the average runs scored by the Rays =the average runs scored by the dodgers

Ha: the Dodgers are better than the Rays

Flag question: Question 3

Question 3

0.25pts

What is the risk level?

Group of answer choices

.05

.01

.25

.5

Flag question: Question 4

Question 4

0.25pts

What is the best statistical test to use?

Group of answer choices

t-Test for independent samples

ANOVA

correlation test

t-Test for dependent samples

z-test

Flag question: Question 5

Question 5

2pts

Compute the test statistic. The formula is below for you.Also, remember to use the variance rather than the standard deviation in your calculation.You have already calculated the variance for your previous assignment, so that part is already done!Put your calculated t value below, round your answer to two decimal places:

Flag question: Question 6

Question 6

1pts

Now it's time to compare our obtained value (the one you just calculated) to the critical value. First, we'll need the degrees of freedom. What are the degrees of freedom?

Group of answer choices

28

19

39

40

Flag question: Question 7

Question 7

1pts

Should we use a "one tailed" or a "two tailed" test for this?

Hint: To figure this out, think about whether it is directional or non-directional. Take a look at your alternative hypothesis (above!), and think about the prompt for the assignment---did we expect a specific team to be better than the other (directional), or are we simply looking at whether the teams are different (non-directional)?

Group of answer choices

two tailed

one tailed

Flag question: Question 8

Question 8

1pts

What is the critical value for this statistical test?(hint: you'll need your answers to the previous two questions, as well as your "level of risk"; remember, if the exact degrees of freedom aren't in the t-test table of critical values, you can choose the closest value that is there).

Group of answer choices

2.023

1.695

2.049

1.562

Flag question: Question 9

Question 9

1pts

Based on your answer to the previous question, what is your decision?

Group of answer choices

Not enough information to decide

Reject the null hypothesis

Fail to reject the null hypothesis

Flag question: Question 10

Question 10

1pts

Write write up your results as you would see it in a results section of an empirical research paper (in APA style). Make sure to include the means andSDs for each group. I do NOT need to see the effect size (Cohen's D)

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Flag question: Question 11

Question 11

1pts

Let's pretend that we got to have a full regular baseball season this year (wouldn't that have been awesome?), and we decided to test whether the teams were different again this season, and we got the following results (written in APA style!):

An independent samples t-Test comparing two teams on their average runs this season showed a significant difference between these two teams t(28) = 3.45, p < .05. The average RBIs for the Rays (M = 36.51, SD = 7.25) were significantly higher than the average RBIs for the Dodgers(M = 28.25SD = 8.25).

Based on this write up and the means and SDs provided here, calculate the effect size for this new comparison, using the Pooled Variance Formula

Flag question: Question 12

Question 12

0.5pts

What "size" is this effect size?

Group of answer choices

Large

Small

Medium

There isn't enough information to answer this question.