A one-sided confidence interval for p can be expressed as $p<\hat{p}+E \text { or } p>\hat{p}-E$, where the margin of error E is modified by replacing $z_{\alpha / 2}$ with $z_{\alpha}$. If Air America wants to report an on-time performance of at least x percent with 95% confidence, construct the appropriate one-sided confidence interval and then find the percent in question. Assume that a simple random sample of 750 flights results in 630 that are on time.

A refrigerator uses refrigerant-134a as the working fluid and operates on an ideal vapor-compression refrigeration cycle between $0.12$ and for a condenser pressure of $0.9 \mathrm{MPa}$. The mass flow rate of the refrigerant is $0.05 \mathrm{~kg} / \mathrm{s}$. Show the cycle on a $T$-$s$ diagram with respect to saturation lines. Find $(a)$ the rate of heat removal from the refrigerated space and the power input to the compressor, $(b)$ the rate of heat rejection to the environment, and $(c)$ the coefficient of performance.

Of the 281 players with at least 300 plate appearances in the 2008 Major League Baseball season, Jeff Mathis of the Los Angeles Angels had the lowest batting average ( $0.194)$ and Brad Wilkerson of the Toronto Blue Jays scored the fewest runs (21). Overall, the mean batting average was $0.272$, with a standard deviation of $0.027$, and the mean number of runs scored was $65.0$, with a standard deviation of 23.6. Which PERFORMANCE was worse? Explain, using the methods of this chapter.

Performance data for a centrifugal fan of 3-ft diameter tested at 750 rpm are $$ \begin{matrix}\text{Volume flow} & \text{106} & \text{141} & \text{176}\\\mathrm{rate, Q (ft^{3}/s)}\\\text{Static pressure} & \text{0.075} & \text{0.073} & \text{0.064}\\\mathrm{rise, \Delta p (psi)}\\\text{Power output,} & \text{2.75} & \text{3.18} & \text{3.50}\\\mathrm{\scr{P} (hp)}\\\text{Volume flow} & \text{211} & \text{246} & \text{282}\\\mathrm{rate, Q (ft^{3}/s)}\\\text{Static pressure} & \text{0.050} & \text{0.033} & \text{0.016}\\\mathrm{rise, \Delta p (psi)}\\\text{Power output,} & \text{3.51} & \text{3.50} & \text{3.22}\\\mathrm{\scr{P} (hp)}\\\end{matrix} $$ Plot the performance data versus volume flow rate. Calculate static efficiency, and show the curve on the plot. Find the best efficiency point, and specify the fan rating at this point.

In the 2008 baseball season, first baseman Ryan Howard of the Philadelphia Phillies led the Major Leagues with 48 home runs (HR) and 146 runs batted in (RBI). Overall, using all players with at least 300 plate appearances, the mean number of HR was $14.9$ with a standard deviation of $9.8$, whereas the mean number of RBI was $62.5$ with a standard deviation of $25.5$. Which was the more impressive PERFORMANCE? Explain, using the methods of this chapter.

Plant acquisitions for selected companies are presented below. **1.** Natchez Industries Inc. acquired land, buildings, and equipment from a bankrupt company, Vivace Co., for a lump-sum price of $680,000. At the time of purchase, Vivace’s assets had the following book and appraisal values. $$ \begin{array}{lrr} & \textbf{Book Values} & \textbf{Appraisal Values}\\ \\ \text{Land} & \$200,000 & \$150,000\\ \text{Buildings} & 230,000 & 350,000\\ \text{Equipment} & 300,000 & 300,000\\ \end{array} $$ To be conservative, the company decided to take the lower of the two values for each asset acquired. The following entry was made. |Land|150,000|| |--|--:|--:| |Buildings| 230,000|| |Equipment| 300,000|| |$\quad$Cash||680,000| **2.** Arawak Enterprises purchased store equipment by making a $2,000 cash down payment and signing a 1-year,$23,000, 10% note payable. The purchase was recorded as follows. |Equipment|27,300|| |--|--:|--:| |$\quad$Cash||2,000| |$\quad$Notes Payable||23,000| |$\quad$Interest Payable||2,300| **3.** Ace Company purchased office equipment for $20,000, terms 2/10, n/30. Because the company intended to take the discount, it made no entry until it paid for the acquisition. The entry was: |Equipment|20,000|| |--|--:|--:| |$    $Cash||19,600| |$    $Purchase Discounts||400| **4.** Paunee Inc. recently received at zero cost land from the Village of Cardassia as an inducement to locate its business in the Village. The appraised value of the land is$27,000. The company made no entry to record the land because it had no cost basis. **5.** Mohegan Company built a warehouse for $600,000. It could have purchased the building for$740,000. The controller made the following entry. |Buildings|740,000|| |--|--:|--:| |$\quad$Cash||600,000| |$\quad$Profit on Construction||140,000| **Instructions** Prepare the entry that should have been made at the date of each acquisition.

As shown in figure, an air conditioner operating at steady state maintains a dwelling at $70^{\circ} \mathrm{F}$ on a day when the outside temperature is $90^{\circ} \mathrm{F}$. If the rate of heat transfer into the dwelling through the walls and roof is $30,000\ \mathrm{Btu} / \mathrm{h}$, might a net power input to the air conditioner compressor of 3 hp be sufficient? If yes, determine the coefficient of performance. If no, determine the minimum theoretical power input, in hp.

Performance Bike Co. is a wholesaler of motorcycle supplies. An aging of the company's accounts receivable on December 31 and a historical analysis of the percentage of uncollectible accounts in each age category are as follows:

$$\begin{array}{lrc} \text { Age Interval } & \text { Balance } & \begin{array}{c} \text { Percent } \\ \text { Uncollectlble } \end{array} \\ \hline \text { Not past due } & \$ 3,250,000 & 0.8 \% \\ 1-30 \text { days past due } & 1,050,000 & 2.4 \\ 31-60 \text { days past due } & 780,000 & 7.0 \\ 61-90 \text { days past due } & 320,000 & 18.0 \\ 91-180 \text { days past due } & 240,000 & 34.0 \\ \text { Over } 180 \text { days past due } & \underline{\hspace{15pt}150,000} & 85.0\\ &\underline{\underline{\$5,790,000}} \end{array}$$

Assume that the allowance for doubtful accounts for Performance Bike Co. had a debit balance of $28,400 as of December 31.

Journalize the adjusting entry for uncollectible accounts as of December 31.

Indicate whether each of the following statements concerning anabolic steroid use is true or false.

a. Illegal anabolic steroid use has very little effect on the performance of female athletes.

b. Use of illegal anabolic steroids affects the male reproductive system.

c. Structurally, testosterone and “Andro” contain the same number of carbon atoms.

d. Structurally, testosterone and THG differ in that all steroid ring attachments are different.

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.

Consider a Carnot-cycle heat pump with R22 as the working fluid; Heat is rejected from the R-22 at 100 F: during which process the R-22 changes from saturated vapor to saturated liquid. The heat is transferred to the R-22 at 30 F. a. Show the cycle on a T-diagram. b. Find the quality of the R-22 at the beginning and end of the isothermal heat addition process at 30 F. c. Determine the coefficient of performance for the cycle.

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.

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?

Refrigerant 134 a enters the compressor of a vapor compression heat pump at $30 \mathrm{lbf} /$ in. $^2, 20^{\circ} \mathrm{F}$ and is compressed adiabatically to $200\ \mathrm{lbf} / \mathrm{in}^2, 160^{\circ} \mathrm{F}$. Liquid enters the expansion valve at $200\ \mathrm{lbf} / \mathrm{in}^2, 120^{\circ} \mathrm{F}$. At the valve exit, the pressure is $30 \mathrm{lbf/in.}^2$ Find

(a) the isentropic compressor efficiency.

(b) the coefficient of performance.