At the beginning of an environmental study, a forest covered an area of 1500 km². Since then, this area has decreased by 7.7% each year. Lett be the number of years since the start of the study. Let y be the area that the forest covers in km".
Write an exponential function showing the relationship between y and t.

Identify the type of observational study described. a statistical analyst obtains data about ankle injuries by examining a hospital's records from the past 3 years. cross-sectional retrospective prospective

If y varies directly as x2 and y=6 when x=6, find the constant of variation.

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.