People sometimes create obstacles to success so that they can attribute failure to the obstacle rather than to lack of ability, a strategy known as ________

Visible light is made up of electromagnetic radiation with wavelengths of

a. 400-700 nanometers. b. 20 to 20,000 C.P.S. c. 300-800 decibels. d. 20 to 20,000 hectometers.

The reason z scores may be used to calculate probabilities is that

a. frequencies are easily converted into probabilities b. all z scores are independent of each other c. all z scores are included within a standard deviation unit (plus or minus) of the mean d. all z scores are included within 2 standard deviation units (plus or minus) of the mean