For following question(s): A researcher is interested in whether color of animal's surroundings affects learning rate. She tests 16 rats in the box with colorful wallpaper. Suppose that it is known that the average rat can learn to run this specific maze (in a box without any special coloring) in 25 trials, with variance of 64; the distribution is normal. The mean number of trials to learn maze for group with colorful wallpaper is 11.
Determine the null hypothesis.?
a. The rate of learning for the sample of rats tested with colorful wallpaper is no different than population of rats tested under ordinary circumstances
b. The rate of learning for sample of rats tested with colorful wallpaper is faster than population of rats tested under ordinary circumstances
c. The rate of learning for population of rats tested with colorful wallpaper is no different than the population of rats tested under ordinary circumstances
d. The rate of learning for the population of rats tested with colorful wallpaper is faster than the population of rats tested under ordinary circumstances