The Environmental Protection Agency(EPA) uses a measure called the Pollutant Standards Index(PSI) to measure air quality

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The Environmental Protection Agency Epa Uses A Measure Called The Pollutant Standards Index Psi To Measure Air Quality 1 (264.4 KiB) Viewed 25 times

The Environmental Protection Agency(EPA) uses a measure called the Pollutant Standards Index(PSI) to measure air quality in a city. A PSI reading over 100 indicates a day when the air quality is considered unhealthy. The measurements represent the number of days in 1995 that the PSI was over 100 for metropolitan areas in the U.S. Midwest. Summary statistics are provided. Which of the following statements is true? n min Q1 median Q3 max mean sd 0 1 2.5 4.25 14 3.6 3.747 20 O the EPA should not be concerned because there were no PSI measurements exceeding 100 there is evidence that this distribution is left-skewed O 25% of metropolitan areas reported 0 or 1 days in which the PSI was over 100 O 14 metropolitan areas participated in this study Question 4 1 pts A sports therapist was interested in evaluating whether stretching immediately before an event was better for sprinters than no stretching. She tested the null hypothesis that average sprinting times among athletes randomized to stretch before an event is equal to average sprinting times among athletes randomized to not stretch before an event. She found a p-value of 0.03. If she uses a 1% significance level instead of the usual 5% significance level, one consequence of this will be that: She is less likely to falsely conclude that stretching has a benefit if, in fact, it does not. Type I error is more likely to occur. O She is more likely to falsely conclude that stretching has a benefit if, in fact, it does not. O It's easier to reject the null hypothesis.