The following data on x = score on a measure of test anxiety and y = exam score for a sample of n = 9 students are consistent with summary quantities given in the paper "Effects of Humor on Test Anxiety and Performance" (Psychological Reports 11999]: 1203-1212): Higher values for x indicate higher levels of anxiety. a. Construct a scatterplot, and comment on the features of the plot. b. Does there appear to be a linear relationship between the two variables? How would you characterize the relationship? c. Compute the value of the correlation coefficient. Is the value of r consistent with your answer to Part (b)? d. Is it reasonable to conclude that test anxiety caused poor exam performance? Explain.

$$\begin{matrix} \text{x} & \text{23} & \text{14} & \text{14} & \text{0} & \text{17} & \text{20} & \text{20} & \text{15} & \text{21}\\ \text{y} & \text{43} & \text{59} & \text{48} & \text{77} & \text{50} & \text{52} & \text{46} & \text{51} & \text{51}\\ \end{matrix}$$

A Carnot vapor refrigeration cycle employs Refrigerant $134 a$ as the working fluid. The refrigerant enters the condenser as saturated vapor at $28^{\circ} \mathrm{C}$ and leaves it as a saturated liquid. The evaporator operates at a temperature of $-10^{\circ} \mathrm{C}$. Find, in $\mathrm{kJ}$ per $\mathrm{kg}$ of refrigerant flow,

(a) the work input to the compressor.

(b) the work developed by the turbine.

(c) the heat transfer to the refrigerant passing via the evaporator. What is the coefficient of performance of the cycle?

Katie and Kim are attending a theater performance. Katie's seat is at floor level. She looks down at an angle of 18$^{\circ}$ to see the orchestra pit. Kim's seat is in the balcony directly above Katie. Kim looks down at an angle of 42$^{\circ}$ to see the pit. The horizontal distance from Katie's seat to the pit is 46ft. What is the vertical distance between Katie's seat and Kim's seat? Round to the nearest inch.

A freezer has a coefficient of performance of 2.40. The freezer is to convert 1.80 kg of water at $25.0^{\circ} \mathrm{C}$ to 1.80 kg of ice at $-5.0^{\circ} C$ in one hour. (a) What amount of heat must be removed from the water at $25.0^{\circ} C$ to convert it to ice at $-5.0^{\circ} C$? (b) How much electrical energy is consumed by the freezer during this hour? (c) How much wasted heat is delivered to the room in which the freezer sits?

A windows air conditioner that consumes of 1 kW of electricity when running and has a coefficient of performance of 3 is placed in the middle of a room and is plugged in. The rate of cooling or heating this air conditioner will provide to the air in the room when running is (a) 3 kJ/s, cooling (b) 1 kJ/s, cooling (c) 0.33 kJ/s, heating (d) 1 kJ/s, heating (e) 3 kJ/s, heating

An axial fan $2 \mathrm{~m}$ in diameter is used in a wind tunnel as shown (test section $1.2 \mathrm{~m}$ in diameter; test section velocity of $60 \mathrm{~m} / \mathrm{s}$ ). The rotational speed of the fan is $1800 \mathrm{rpm}$. Assume the density of the air is constant at $1.2 \mathrm{~kg} / \mathrm{m}^3$. There are negligible losses in the tunnel. The performance curve of the fan is identical to that shown in the mentioned figure. Compute the power needed to operate the fan.

For the cycle of Problem, investigate the effects on cycle performance as the higher extraction pressure takes on other values. The operating conditions for the open feedwater heater are unchanged from those in earlier problem. Assume that condensate drains from the closed feedwater heater as saturated liquid at the higher extraction pressure. Also feedwater leaves the heater at $12\ \mathrm{MPa}$ and a temperature equal to the saturation temperature at the extraction pressure. Construct suitable plots and discuss.

Explain why the following technique for transaction execution may provide better performance than just using strict two-phase locking: First execute the transaction without acquiring any locks and without performing any writes to the database as in the validation-based techniques, but unlike the validation techniques do not perform either validation or writes on the database. Instead, rerun the transaction using strict two-phase locking. (Hint: Consider waits for disk I/O.)

One yardstick for measuring how steadily-if slowly-athletic performance has improved is the mile run. In 1954, Roger Bannister of Britain cracked the 4-minute mark, setting the record for running a mile in 3 minutes, 59.4 seconds, or 239.4 seconds. In the half-century since then, the record has decreased by 0.3 second per year. If this trend continues, in which year will someone run a 3-minute, or 180-second, mile?

The adjusted trial balance of Estella Real Estate Appraisal at June 30, 2016, follows:

$$\begin{array}{c} \textbf{ESTELLA REAL ESTATE APPRAISAL}\\ \text{Adjusted Trial Balance}\\ \text{June 30, 2016}\\ \end{array}$$

$$\begin{array}{lrr} &\textbf{Balance}\\ \textbf{Account Title}&\textbf{Debit}&\textbf{Credit}\\ \text{Cash}&\$4,600\\ \text{Accounts Receivable}&5,300\\ \text{Office Supplies}&1,500\\ \text{Prepaid Insurance}&1,600\\ \text{Building}&77,000\\ \text{Accumulated Depreciation - Building}&&\$26,000\\ \text{Land}&13,500\\ \text{Accounts Payable}&&19,300\\ \text{Interest Payable}&&8,400\\ \text{Salaries Payable}&&1,900\\ \text{Unearned Revenue}&&5,300\\ \text{Notes Payable (long-term)}&&37,000\\ \text{Common Stock}&&3,000\\ \text{Retained Earnings}&&37,000\\ \text{Dividends}&27,200\\ \text{Service Revenue}&&48,900\\ \text{Insurance Expense}&4,300\\ \text{Salaries Expense}&33,000\\ \text{Supplies Expense}&200\\ \text{Interest Expense}&8,400\\ \text{Utilities Expense}&2,500\\ \text{Depreciation Expense - Building}&7,700\\ \text{Total}&\underline{\underline{\$186,800}}&\underline{\underline{\$186,800}}\\ \end{array}$$

Requirements

1. Prepare the company's income statement for the year ended June 30, 2016.
2. Prepare the company's statement of retained earnings for the year ended June 30, 2016.
3. Prepare the company's classified balance sheet in report form at June 30, 2016.
4. Journalize the closing entries.
5. Open the T-accounts using the balances from the adjusted trial balance, and post the closing entries to the T-accounts.
6. Prepare the company's post-closing trial balance at June 30, 2016.

Alvarez Manufacturing Inc. is a job shop. The management of Alvarez Manufacturing Inc. uses the cost information from the job sheets to assess cost performance. Information on the total cost, product type, and quantity of items produced is as follows:

$$\begin{array}{lclcr} \text { Date } & \text { Job No. } & \text { Product } & \text { Quantity } & \text { Amount } \\ \hline \text { Jan. 2 } & 1 & \text { TT } & 520 & \$ 16,120 \\ \text { Jan. 15 } & 22 & \text { SS } & 1,610 & 20,125 \\ \text { Feb. 3 } & 30 & \text { SS } & 1,420 & 25,560 \\ \text { Mar. 7 } & 41 & \text { TT } & 670 & 15,075 \\ \text { Mar. 24 } & 49 & \text { SLK } & 2,210 & 22,100 \\ \text { May 19 } & 58 & \text { SLK } & 2,550 & 31,875 \\ \text { June 12 } & 65 & \text { TT } & 620 & 10,540 \\ \text { Aug. 18 } & 78 & \text { SLK } & 3,110 & 48,205 \\ \text { Sept. 2 } & 82 & \text { SS } & 1,210 & 16,940 \\ \text { Nov. 14 } & 92 & \text { TT } & 750 & 8,250 \\ \text { Dec. 12 } & 98 & \text { SLK } & 2,700 & 52,650 \end{array}$$

a. Develop a graph for each product (three graphs) with Job Number (in date order) on the horizontal axis and Unit Cost on the vertical axis. Use this information to determine Alvarez Manufacturing Inc.’s cost performance over time for the three products.

b. What additional information would you require in order to investigate Alvarez Manufacturing Inc.’s cost performance more precisely?

Data giving the number of hours a person studied compared to his or her performance on an exam are given in the table:

$$\begin{array}{c|c} \text{Hours Studied} & \text{Exam Score} \\ x & y\\ \hline 0 & 50\\ 2 & 74\\ 4 & 85\\ 6 & 90\\ 8 & 92 \end{array}$$

(a) Find a least squares line of best fit to the above data. (b) What prediction would this line make for a student who studied 9 hours?

The following data pertain to the Waikiki Sands Hotel for the month of March.

$$\begin{array}{lcc} & \textbf{ Flexible Budget March } & \textbf{ Actual Results March } \\ & \textbf{ (in thousands)* } & \textbf{ (in thousands)* } \\ \text{ Banquets and Catering } & \$ 650 & \$ 658 \\ \text{ Restaurants } & 1,800 & 1,794 \\ \text{ Kitchen staff wages } & (85) & (86) \\ \text{ Food } & (690) & (690) \\ \text{ Paper products } & (125) & (122) \\ \text{ Variable overhead } & (75) & (78) \\ \text{ Fixed overhead } & (90) & (93) \end{array}$$

$^*$Numbers without parentheses denote profit; numbers with parentheses denote expenses.

Prepare a March performance report. The report should have six numerical columns with headings analogous. Your performance report should cover only the Food and Beverage Department and the Kitchen. Draw arrows to show the relationships between the numbers in the report. For the year-to-date columns in your report, use the previous data given. You will need to update those figures using the March data given above.

In 2012, the New York Yankees won 95 games and spent $\$ 198$ million on salaries for their players (USA Today). Is there a relationship between salary and team performance in Major League Baseball? For the 2012 season, a linear model fit to the number of Wins (out of 162 regular season games) from the team Salary $(\$ M)$ for the 30 teams in the league is:

$$\widehat{\text { Wins }}=76.45+0.046 \text { Salary. }$$

c) What does the slope mean in this context?