Based on data from two very large independent samples, two ...

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Question 1

Trainers need to estimate the level of fat in athletes to ensure good health. Initial tests were based on a small sample but now the trainers double the sample size for a follow-up test. The main purpose of the larger sample is to…
◦ decrease the standard deviation of the sampling model.
◦ reduce confounding due to other variables.
◦ decrease the variability in the population.
◦ reduce non-response bias.
◦ reduce response bias.

Question 2

Based on data from two very large independent samples, two students tested a hypothesis about equality of population means using α = 0.02. One student used a one-tail test and rejected the null hypothesis, but the other used a two-tail test and failed to reject the null hypothesis. Which of these might have been their calculated value of t?
◦ 2.66
◦ 1.22
◦ 2.22
◦ 1.55
◦ 1.88

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