Ea7.
lo 2.2western trucking operates a fleet of delivery trucks. the fixed expenses to operate the fleet are $79,900 in march and rose to $93,120 in april. it costs western trucking $0.15 per mile in variable costs. in march, the delivery trucks were driven a total of 85,000 miles, and in april, they were driven a total of 96,000 miles. using this information, answer the following:

what were the total costs to operate the fleet in march and april, respectively?
what were the cost per mile to operate the fleet in march and april, respectively?

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.