Which statement best describes scientific theories? A. Scientific theories attempt to explain an entire group of related phenomena.

B. Scientific theories are based on facts that describe natural events.

C. Scientific theories describe natural events but do not explain them.

D. Scientific theories are facts based on observations of events in the natural world.

Aresearcher plans to conduct a test of hypotheses at the 1% significance level. she designs her study to have a power of 0.90 at a particular alternative value of the parameter of interest. the probability that the researcher will commit a type ii error for the particular alternative value of the parameter at which she computed the power is: a. 0.90. b. 0.01. c. 0.10. d. equal to 1

When the velocity of an object is doubled, by what factor is its momentum changed? by what factor is its kinetic energy changed? a) the momentum is zero. b) the momentum is not zero. c) difficult to say.

Idon’t quite understand this problem