Fitness World, Inc., produces two basic types of weight-lifting equipment, Model 9 and Model 14. Pertinent data are as follows: LOADING... (Click the icon to view the data.) The weight-lifting craze suggests that Fitness World Fitness World can sell enough of either Model 9 or Model 14 to keep the plant operating at full capacity. Both products are processed through the same production departments. Read the requirements LOADING... . Before determining which products to produce, let's calculate the contribution margin per unit and the contribution margin per machine hour for each machine. (Enter the amounts to the nearest cent.) Model 9 Model 14 Selling price per unit 95.00 - Variable costs per unit = Contribution margin per unit ÷ Relative use of machine-hours per unit of product = Contribution margin per machine hour

Reliability and validity reliability and validity are two important considerations that must be made with any type of data collection. reliability refers to the ability to consistently produce a given result. in the context of psychological research, this would mean that any instruments or tools used to collect data do so in consistent, reproducible ways. unfortunately, being consistent in measurement does not necessarily mean that you have measured something correctly. to illustrate this concept, consider a kitchen scale that would be used to measure the weight of cereal that you eat in the morning. if the scale is not properly calibrated, it may consistently under- or overestimate the amount of cereal that’s being measured. while the scale is highly reliable in producing consistent results (e.g., the same amount of cereal poured onto the scale produces the same reading each time), those results are incorrect. this is where validity comes into play. validity refers to the extent to which a given instrument or tool accurately measures what it’s supposed to measure. while any valid measure is by necessity reliable, the reverse is not necessarily true. researchers strive to use instruments that are both highly reliable and valid.