Lee surveyed students at school about whether they buy lunch or bring lunch from home. The data she gathered is shown in
the two-way table below.
Source of Student Lunches
Buy Lunch
in the Cafeteria
Bring Lunch
to School
12
20
18
Boys
Girls
30
According to the data in the table, what percentage of boys bring lunch to school?
15%
37.5%
40%
66.7%
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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.