Applicants for a Particular Job,which Involves Extensive Travel in Spanish-Speaking

question 17

Multiple Choice

Applicants for a particular job,which involves extensive travel in Spanish-speaking countries,must take a proficiency test in Spanish.The sample data below were obtained in a study of the relationship between the numbers of years applicants have studied Spanish and their score on the test.A 95% prediction interval for the score of an applicant who has studied Spanish for 2.6 years was determined to be (45.7 ,74.0) .
Dependent variable is: Score
R-squared = 83.0%
S = 5.65138 with 10 - 2 = 8 degrees of freedom

• A)Based on this regression,we are 95% confident that the mean test score for applicants who have studied Spanish for 2.6 years will be between 45.7 and 74.0.
• B)Based on this regression,we are 95% confident that the mean number of years spent studying Spanish will increase between 45.7 and 74.0 years for each additional point earned on the test.
• C)Based on this regression,we are 95% confident that the mean test score will increase between 45.7 and 74.0 points for each additional year spent studying Spanish.
• D)Based on this regression,an applicant who has studied Spanish for 2.6 years will score between 45.7 and 74.0 on the proficiency test,with 95% confidence.
• E)Based on this regression,we know that 95% of all random samples will have a mean test score between 45.7 and 74.0 points.

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Definitions:

Average Variable Cost

The total variable cost divided by the number of units produced, representing the average cost per unit of output that varies with production.

Average-Fixed-Cost Curve

A graphical representation that shows the average fixed costs of production at different levels of output.

Average-Total-Cost Curve

Graphical representation that shows how the average total costs of production change as the quantity of output is altered.

Average-Fixed-Cost Curve

A graphical representation that shows how the average fixed costs of production decrease as the quantity of output increases, due to spreading fixed costs over a larger number of units.