Omar is a school superintendent who is trying to improve the selection process for teachers in his school district. Before implementing the selection test as a deciding factor in the hiring process, Omar decides to give the test to current teachers to see if the test can accurately differentiate the top performers from the mediocre and poor performers. After that, he compares the scores of the teachers to their performance ratings on appraisals. In this scenario, Omar is assessing the of the test. a. concurrent validity b. predictive validity c. test-retest validity d. face validity

B. Predictive Validity

Explanation:

Predictive Validity is a type of validity or form of evidence, often used in sociology, psychology or any form of behavioural science test, in which the purpose is to defend the use of a test for predicting other outcomes.

In other words, it is a method of developing validity evidence for employment tests in which a test is given to present employees, then a rating of those employees' job performance that are gathered or obtained independently of the test are used to predict other outcomes.

Predictive validity is however shown when a test correlates well with a measure that has previously been validated.

Hence, in this case, Omar is assessing the Predictive Validity of the test.

marginal cost is a microeconomic measure that us to evaluate the extent to which the level of production of a good is sustainable in accounting, that is, to how many quantities the company plans to profit from the production of the good.

the concept of marginal cost is simple, it means the cost of producing one more item. for example, in the case of pies, the marginal cost is the cost of producing one more pie than those that have already been produced.

it is important to understand that productive activity influences marginal cost. the marginal cost of some goods can be very high, while others may be insignificant. for example, the marginal cost of producing an extra plane is very high. already the marginal cost of a water company to provide 1l more water is derisory.

in the case of pies, the cost involves the inputs, the labor and the fixed cost, which involves the fixed space of the bakery. the level of production initially has the marginal cost decreasing because there is space and manpower available. however, to produce more you have to hire more workers and buy more inputs. if physical space is limited, workers will conflict with places, inputs and their productivity will decrease, meaning there is an optimum point of production for each level of space and manpower. from this point on, the productivity of the workers will be getting smaller because of lack of space, so that the marginal cost of producing one more pie will be increasing. so, although you have not posted the chart, but if you have the answer, you can see that my explanation goes according to the marginal cost curve that will increase from the 4th pie, answer (c).

raliegh, north ! hope this