Do college professors who provide their students with assistance on homework help improve student grades? This was the research question of interest in the Journal of Accounting Education (Vol. 25, 2007). A sample of 175 accounting students took a pretest on a topic not covered in class, then each was given a homework problem to solve on the same topic. The students were assigned to one of three homework assistance groups. Some students received the completed solution, some were given check figures at various steps of the solution, and some received no help at all. After finishing the homework, the students were all given a posttest on the subject. The dependent variable of interest was the knowledge gain (or, test score improvement). These data are saved in the ACCHW file.
In terms of the

$$\beta ^ { \prime } \mathrm s$$

in the model, give an expression for the difference between the mean knowledge gains of students in the “completed solution” and “no help” groups.

Work in small groups. Imagine you are starting a greeting card company. Decide what functions your team members will perform. Consider each person’s talents and interests. Will your company be structured formally or informally? Make a chart using presentation software to show how you organized your company. Present your chart to the class.

The equation contains small figures ( $\square, \triangle$, and $\$$) that represent nonzero real numbers. Use properties of equality to isolate$x$on one side of the equation and the small figures on the other side.$ $\frac{x}{\square}$-\Delta=-\

Evaluate, correct to 3 significant figures: $\sqrt[4]{100}$

a) Plot the triangle with vertices A(-2, 1), B(2, -1), and C(0, 5). b) Determine the lengths of the sides of the triangle. c) Classify $\triangle \mathrm { ABC }$ Explain your reasoning. d) Find the area of $\triangle A B C$ e) Describe how you could use geometry software to verify your answers to parts b), c), and d).

Solve the following initial value problems and leave the solution in implicit form. Use graphing software to plot the solution. If the implicit solution describes more than one function, be sure to indicate which function corresponds to the solution of the initial value problem. $y y^{\prime}(x)=\frac{2 x}{\left(2+y^{2}\right)^{2}}, y(1)=-1$

Briefly describe the given concept/process : law of combining volumes

Accounting has its own vocabulary and basic relationships. Match the accounting terms at the left with the corresponding definition or meaning at the right.

$$\begin{matrix} \text{\_\_\_\_ 1. Debit } & \text{ A. Always an asset }\\ \text{ \_\_\_\_ 2. Expense} & \text{B. Side of an account where increases are recorded}\\ \text{\_\_\_\_ 3. Net income } & \text{C. Record of transactions }\\ \text{\_\_\_\_ 4. Ledger } & \text{D. The cost of operating a business; a decrease in stockholder’s equity}\\ \text{\_\_\_\_ 5. Posting} & \text{E. Grouping of accounts }\\ \text{\_\_\_\_ 6. Normal balance } & \text{F. Copying data from the journal to the ledger }\\ \text{\_\_\_\_ 7. Payable } & \text{G. Revenues – Expenses }\\ \text{ \_\_\_\_ 8. Journal } & \text{H. Always a liability}\\ \text{\_\_\_\_ 9. Receivable } & \text{I. Left side of an account}\\ \text{\_\_\_\_ 10. Owners’ equity } & \text{ J. Assets – Liabilities }\\ \end{matrix}$$

How might the law of supply and demand relate to inventory storage?

Use calculus to sketch the graph of the given function. $f(x)=3 x^{5}-5 x^{3}+4$

A consultant has three sources of income—from teaching short courses, from selling computer software, and from advising on projects. His expected annual incomes from these sources are $20,000,$25,000, and $15,000, and the respective standard deviations are$2,000, $5,000, and$4,000. Assuming independence, find the mean and standard deviation of his total annual income.

Determine the number of significant figures in each measurement: 0.035 kg

Round each number to four significant figures. 84,791 kg

Solve the following initial value problems and leave the solution in implicit form. Use graphing software to plot the solution. If the implicit solution describes more than one function, be sure to indicate which function corresponds to the solution of the initial value problem.`$y^{\prime}(t)=\frac{2 t^{2}}{y^{2}-1}, y(0)=0$