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on friday, there were 8 snowboarders for every 3 skiers at a local ski resort. on saturday, the ratio of the number of snowboarders to the number of skiers was 4: 7. there were 168 snowboarders at the ski resort on friday. there were the same number of people at the ski resort on saturday as there were on friday. how many more skiers were there than snowboarders at the ski resort on saturday?

Arandomized controlled trial is designed to evaluate the effect of metoprolol in patients with heart failure. while preparing for statistical analysis, the researcher reviews some common types of statistical errors. which of the following statements is true regarding a type i error in a clinical study? a. the study is not significantly powered to detect a true difference between study groups. bthe null hypothesis is true but is rejected in error. c. the null hypothesis is false but is accepted in error. d. type i error is also known as beta and is usually 0.1 or 0.2. e. type i error depends on the study's confidence interval.