An SAT prep course claims to improve the test scores of students. The table shows the critical reading scores for 10 students the first two times they took the SAT, once before for the course, and once after the course. Test the company’s claim at α = 0.01. Extra columns provided for calculations.
Student Score
Before
Score After 1 308 400 2 456 524 3 352 409 4 433 491 5 306 348 6 471 583 7 422 451 8 370 408 9 320 391 10 418 450

To improve worker satisfaction a company institutes an exercise program for its workers. It measures 10 randomly selected workers’ satisfaction levels before and then after the program is instituted. Does the exercise program significantly improve their worker's job satisfaction? State the hypotheses, check conditions, compute test statistics, standardize and give degrees of freedom. Include a sketch, state the p-value followed by your conclusion.

Before

34

28

29

45

26

27

24

15

15

27

After

33

36

50

41

37

41

39

21

20

37

. Knowledge of basic statistical concepts of 10 randomly selected engineers was measured on a scale of 100, before and after a short course in statistical quality control. This resulted in the data tabled below.

Researchers believe that the short course will improve test scores. They will analyze this with a hypothesis test. Give the details of the test

You want to study an agricultural treatment to remove a pest on citrus plants. Suppose you have a citrus farm. The presence of the pest is measured by the productivity of the plant. Suppose that before and after applying the treatment the productivity of 9 plants was measured. Measurements are in numbers of bags and are in the following table:

Find the confidence interval to see if there is an improvement in productivity with the treatment of the pest. Determine with 95% confidence the interval for the average difference in citrus productivity.

A student sits on a rotating stool holding two 2.2-kg objects. When his arms are extended horizontally, the objects are 1.0 m from the axis of rotation and he rotates with an angular speed of 0.75 rad/s. The moment of inertia of the student plus stool is 3.0 kg · m2 and is assumed to be constant. The student then pulls in the objects horizontally to 0.46 m from the rotation axis. (a) Find the new angular speed of the student. (b) Find the kinetic energy of the student before and after the objects are pulled in. before after (c) Where does the energy difference come from/go to?

To improve worker satisfaction a company institutes an exercise program for its workers. It measures 10 randomly selected workers’ satisfaction levels before and then after the program is instituted. Does the exercise program significantly improve their workers job satisfaction? State the hypotheses, check conditions, compute test statistics, standardize and give degrees of freedom. Include a sketch, state the p-value followed by your conclusion.

Before 34 28 29 45 26 27 24 15 15 27

After 33 36 50 41 37 41 39 21 20 37

Consider the situation where one IOLab device rolls into another stationary IOlab device and they stick together and they roll off together. When answering the following questions, answer them specifically for this situation.

How could you calculate the total momentum before the collision?      

How could you calculate the total momentum after the collision?      

How could you calculate the total kinetic energy before the collision?      

How could you calculate the total kinetic energy after the collision?      

(Extra information: the IOLab device can generate both Force/Time graphs and Velocity/ Time graphs)

Answer the following​ questions:

a.  Calculate the ​before-tax cost of the Sony bond using the​ bond's yield to maturity​ (YTM).

b.  Calculate the ​after-tax cost of the Sony bond given the corporate tax rate.

a.  The before-tax cost of the Sony bond using the​ bond's yield to maturity​ (YTM) is ???%.

​(Round to two decimal​ places.)

b.  The after-tax cost of the Sony bond given the corporate tax rate is ???%

​(Round to two decimal​ places.)

An economist is interested in whether the level of the minimum wage affects employment. In order to study this issue they got data from a random sample of 322 New Jersey fast food restaurants before and after an increase in the NJ minimum wage from $4.25 to $5.05 per hour. The change in full time equivalent employees per restaurant in the sample before and after the increase was 0.80 with a variance of 77.5. Must not be done using excel.

1. Test whether this suggests the increase in the minimum wage had an effect on employment.
2. What statistical errors might have been made?
3. Why might this not answer the question?

QUESTION 43

1. How many of the following statements is/are true?

Statement 1: An increase in the market YTM after a bond is purchased but before the first coupon date will lead to a realized return equal to the YTM of the bond when the bond was purchased for a buy-and-investor.

Statement 2: A decrease in the market YTM after a bond is purchased but before the first coupon date will lead to a realized return equal to the YTM of the bond when the bond was purchased for a buy-and-investor.

Statement 3: A floating rate bond earns a rate of return equal to the YTM of the bond when it was purchased.