Confidence Intervals & Hypothesis Testing Practice Test - GRE Quantitative Reasoning | AI Practice & Tutor

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Q1

The confidence interval created for the difference in means between two training programs for middle distance college runners is $\small \left ( -4.5, 6.5\right )$ . The variable being measured is the improvement in seconds of mile times over the course of a season. One program has more speed work and intervals, while the other focuses more on distance training.

What does the confidence interval tell us about the difference in the two programs?

Subject Horn Length (in) Subject Horn Length (in)
1 19.1 11 11.6
2 14.7 12 18.5
3 10.2 13 28.7
4 16.1 14 15.3
5 13.9 15 13.5
6 12.0 16 7.7
7 20.7 17 17.2
8 8.6 18 19.0
9 24.2 19 20.9
10 17.3 20 21.3

The data above represents measurements of the horn lengths of African water buffalo that were raised on calcium supplements. Construct a 95% confidence interval for the population mean for horn length after supplments.

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