Pre_Class Assignment #11

Pre-Class Assignment #11 - Which Team has Better Batters? Started: Nov 9 at 5:23pm

Quiz Instructions This assignment is related to your Chapter 11 (Salkind) material.

Instructions: Do you recall the assignment we did a few weeks ago when we calculated the standard deviation and variance for the RBIs for the two baseball teams (for the Washington Nationals and the Houston Astros)? Well, let’s revisit those data to figure out if there is a significant difference between the two teams on their RBI records. 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 your self some time on this assignment!).

Runs Batted In per Team

Astros Nationals

80 50

40 63

45 124

100 104

56 56

95 45

56 67

54 50

36 55

6 67

10 40

54 26

5 6

98 45

4 5

14 12

10 10

11 4

12 11

4 4

0.5 ptsQuestion 1

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What is the null hypothesis?

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0.5 ptsQuestion 2

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Select the alternative hypothesis

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1 ptsQuestion 3

What is the best statistical test to use?

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2 ptsQuestion 4

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:

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Quiz saved at 8:20pm

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1 ptsQuestion 5

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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)?

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Please make a copy of your pre-class assignment answers before submitting!

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