In sports, the ________ states that after the onset of deliberate practice, progress occurs at a rapid rate, but the rate of learning diminishes over time

Research by Gentile et al. (2009) on media effects and helping behavior found that

a. people assigned their partner the easiest puzzles after playing a prosodies video game. b. people assigned their partner the easiest puzzles after playing a violent video game. c. people were more likely to answer more questions on a questionnaire after playing a prosodies video game. d. people were more likely to answer fewer questions on a questionnaire after playing a violent video game.

A researcher is interested in whether high school students who play sports have a higher or lower body mass index (BMI) than students in the general population. The researcher is unsure whether playing sports will decrease body mass (due to more calories burned) or increase body mass (due to more muscle mass). The researcher selects a sample of 60 athletes and finds that their average BMI is 22

The average (µ) in the general population of students is 22.5 with a standard deviation (s) of 3 . What is zobt for this sample? a. 0.98 b. 1.29 c. 1.96 d. 2.25