The equation for the height of a ball that is thrown is given by h = -5t? + 15t + 20 where h is the height of the ball (in feet) and t is the number of seconds after the ball is
thrown. What does the y-intercept represent in this context?
a. The y-intercept indicates that the ball is thrown up at a velocity of 5 feet per
second
b. The y-intercept indicates that the ball starts at 15 seconds.
c. The y-intercept indicates that the ball starts at 20 feet.
d. The y-intercept indicates that when the ball was re-leased at t=1, it was thrown
upward with a velocity of 15 feet per second.

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.