Suppose that we want to evaluate the effect of several variables onannual saving and that we have a panel data set on individuals collected in January1990 and January 1992. If we include a year dummy variable for 1992 and use firstdifferencing, can we also include age in the original model? Explain.

Njuly, noel & vang company purchased materials costing $23,100 and incurred direct labor cost of $19,800. manufacturing overhead totaled $35,200 for the month. information on inventories was as follows: july 1 july 31 materials $6,820 $7,810 work in process 770 1,320 finished goods 3,630 2,970 what was the cost of goods sold for july? a. $71,300 b. $71,100 c. $69,600 d. $77,220

Which of the following best explains why treasury bonds have an effect on the size of the money supply? a. the amount of treasury bonds in circulation affects both unemployment and inflation. b. the government can spend more money and charge lower taxes by using treasury bonds. c. the federal reserve bank can buy and sell these bonds to raise or lower bank deposits. d. the interest paid on treasury bonds influences the interest rates charged by private banks. 2b2t

Acompany is developing a new high­performance wax for cross country ski racing. in order to justify the price marketingwants, the wax needs to be very fast. specifically, the mean time to finish their standard test course should be less thanseconds for a former olympic champion. to test it, the champion will ski the course 8 times. the champion's times(selected at random) are 59.9 61.9 48.8 52.2 46.6 45.3 50.6 and 41.1 seconds to complete the test course. complete parts a and b below.a) should they market the wax? assume the assumptions and conditions for appropriate hypothesis testing are metfor the sample.assume=0.05. what are the null and alternative hypotheses? choose the correct answer below.b) suppose they decide not to market the wax after the test, but it turns out that the wax really does lower the champion'saverage time to less thanseconds. what kind of error have they made? explain the impact to the company of such anerror.