Answer Happy

A company hires you to test the effect a new vitamin has on the lifespan of mice, against a null hypothesis of zero months. Which of the following is the strongest reason to select a one-tailed test? O Biologists at the company are expecting the effect on lifespan to be positive. Biologists at the company are hoping the effect on lifespan will be positive. The distribution of mouse lifespans is asymmetric, with a positive skew. It is best to select a conservative test, so that readers are more likely to trust your results. There is no value in a vitamin that shortens mouse lifespan. If the effect is negative, the company would not publish the results. Instead, it would start over with a different vitamin.