The linear regression equation, Y = a + bX, was estimated. The following computer printout was obtained: 
Given the above information, what is the critical value of t at the 1% level of significance?
A. 2.921
B. 1.746
C. 2.120
D. 2.878
Answer: A
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Which category has the highest amount of state and local spending?
a. education b. police c. firefighting d. transportation
Which of the following is a public good?
a. railroads b. genetic diversity c. a space station d. military aircraft e. commercial aircraft
Long-run cost curves are U-shaped because
A) of the law of demand. B) of the law of diminishing returns. C) of economies and diseconomies of scale. D) of the law of supply.
Table 30.2Number of stylists (per week)Total output (per week)Marginal physical product (output per stylist)Total revenue (dollars per week)Marginal revenue product (dollars per stylist)00---________---160________________________280________________________390________________________490________________________Table 30.2 shows how many hairstyling appointments a hair salon can schedule per week based on the number of stylists. In the spaces provided, compute the marginal physical product (MPP) of the hair stylists, total revenue, and marginal revenue product of the stylists, assuming that a hair stylist charges $60 per appointment. What is the marginal physical product of the fourth hairstylist?
A. 0. B. 22.5. C. 90. D. 5,400.