A power calculation has shown that if μ = 8, the power of a test of H0: μ ≥ 10 versus H1:μ<10 is 0.90. If instead μ = 7, which one of the following statements is true?

i. The power of the test will be less than 0.90.

ii. The power of the test will be greater than 0.90.

iii. We cannot determine the power of the test without knowing the population standard deviation σ.

1. It has been noticed by many that the use of electronic devices is growing rapidly among today's youth. A research has been conducted to evaluate the correlation between electronic media use and the presence of psychiatric symptoms. Although there are different opinions on the overuse of the Internet, both positive and negative, it has come to the authors attention that Canadian youth are...