Strike two Remember the Little League instructional video discussed in Chapter 24? Ads claimed it would improve the performances of Little League pitchers. To test this claim, 20 Little Leaguers threw 50 pitches each, and we recorded the number of strikes. After the players participated in the training program, we repeated the test. The table shows the number of strikes each player threw before and after the training. A test of paired differences failed to show that this training improves ability to throw strikes. Is there any evidence that the effectiveness of the video (After Before) depends on the players initial ability to throw strikes (Before)? Test an appropriate hypothesis and state your conclusion. Propose an explanation for what you find.

1 STAT 145 Introduction to Statistics 1 Chapter 2 Organizing and Summarizing Data Terms ormulas 2.1 Organizing Qualitative Data Objectives: Group data in tables / Construct bar graphs and pie charts Frequency Distribution: A number of occurrences for each category of the data Relative Frequency: Proportion of observations within a category Relative Frequency = Frequency / Sum of ALL Frequencies