A study was conducted to determine the effectiveness of interval training (alternating between walking and running at a fast pace) on running speed. A sample of n = 9 runners improved their speed on 5K runs after the training by an average of MD = 1.58 minutes with sD = .61. If we want to construct a 90% confidence interval for the population mean difference, what t-values should be used.
A) ±2.365
B) ±2.306
C) ±1.895
D) ±1.860
Correct Answer:
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