Describe how the goal of an experimental research study is different from the goal for nonexperimental or correlational research. Identify the two elements that are necessary for an experiment to achieve its goal. The goal of an experimental research study is which of the following?

a. To make an observation to determine the correlation between two variables

b. To demonstrate the existence of a cause-and-effect relationship between two variables

c. To make an observation without manipulating any variables

d. To make an observation to determine the relationship among several variables

To accomplish the goal, an experiment must do which of the following? Check all that apply.

a. Control extraneous variables

b. Manipulate several variables

c. Manipulate an independent variable

d. Control an independent variable

You are thinking of making your mansion more energy efficient by replacing some of the light bulbs with compact fluorescent bulbs, and insulating part or all of your exterior walls. each compact fluorescent light bulb costs $4 and saves you an average of $2 per year in energy costs, and each square foot of wall insulation costs $1 and saves you an average of $0.20 per year in energy costs.† your mansion has 150 light fittings and 3000 sq ft of uninsulated exterior wall. to impress your friends, you would like to spend as much as possible, but save no more than $750 per year in energy costs (you are proud of your large utility bills). how many compact fluorescent light bulbs and how many square feet of insulation should you purchase? how much will you save in energy costs per year? (if an answer does not exist, enter dne.)

Vendors provide restaurants with what? o a. cooked items ob. raw materials oc. furniture od. menu recipes

Laws corporation is considering the purchase of a machine costing $16,000. estimated cash savings from using the new machine are $4,120 per year. the machine will have no salvage value at the end of its useful life of six years and the required rate of return for laws corporation is 12%. the machine's internal rate of return is closest to (ignore income taxes) (a) 12% (b) 14% (c) 16% (d) 18%