. A steam main (outside diameter of 16.8 cm and inside diameter of 15.4 cm) is covered with 5-cm of high temperature insulation (k = 0.095 W/m. K) and 3.8 cm of lower temperature insulation (k = 0.07W/m. K). Calculate the heat loss from 150 m pipe assuming that inner and outer surface temperatures of the insulation are 450 and 30 °C, respectively. Also determine the temperature at the interface between two layers of insulation (10 points).

Calculation of Molar Ratios of Conjugate Base to Weak Acid from pH For a weak acid with a pKa of 6.0, calculate the ratio of conjugate base to acid at a pH of 5.0.

Choice of Weak Acid for a Buffer Which of these com-pounds would be the best buffer at pH 5.0: formic acid (pKa 5 3.8), acetic acid (pKa 5 4.76), or ethylamine (pKa 5 9.0)? Briefly justify your answer.

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Surprisingly, a study found that children under stress reported fewer symptoms of depression and anxiety but scored higher on a Lie Scale (a measure of tendency to give socially desirable responses). The population mean for the Lie Scale for nonstressed children is 3.8. A sample of 40 children under stress had Lie Scale sample mean of 4.4, with a standard deviation of 2.5. Test the hypothesis that children under stress are more likely to give socially desirable answers. Write a complete conclusion in the context of the problem.

Parole Co. has 72,158 bonds outstanding that are selling at par value. The bonds yield 8.8 percent. The company also has 4.7 million shares of common stock outstanding. The stock has a beta of 1.3 and sells for $46.8 a share. The U.S. Treasury bill is yielding 3.8 percent and the market risk premium is 7.8 percent. Parole's tax rate is 30 percent. What is the firm's weighted average cost of capital? Enter answer in percents.

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A survey found that​ women's heights are normally distributed with mean

62.5 in62.5 in.

and standard deviation

2.5 in2.5 in.

The survey also found that​ men's heights are normally distributed with mean

68.4 in68.4 in.

and standard deviation

3.8 in3.8 in.

Consider an executive jet that seats six with a doorway height of

56.3 in56.3 in.

Complete parts​ (a) through​ (c) below.

a. What percentage of adult men can fit through the door without​ bending?

The percentage of men who can fit without bending is

nothing​%.

You currently have $300,000. You want to invest it in the following three assets: 10-year US Treasury bond with coupon raate 3.8%, Blandy and Gourmange stocks below:

Your goal is to have the expected return of 6.8% with a minimum portfolio risk. How much money should you allocate to these three assets?

A study was conducted to investigate the effectiveness of acupuncture in reducing pain. Results for 6 randomly selected subjects are given in the accompanying table (the values are before and after acupuncture)

A) Is there sufficient evidence to conclude that acupuncture has no effect in reducing pain? Use cl: 0.05

b) construct a 95% confidence interval for the mean of the "before-after" differences.

1. Using the following data, conduct a linear regression analysis (by hand). In this analysis, you are testing whether SAT scores are predictive of overall college GPA. Also, write out the regression equation. How would you interpret your results?

We are interested in seeing if there are any meaningful differences in the willingness of certain tapestry segments to buy organic products. Top Tier reports purchasing an average of 3.8 organic items per week per family with a standard deviation of 2, while Pleasantville reports purchasing 2.3 organic items per week per family with a standard deviation of 0.5. The sample size for Top Tier is 50 and the sample size for Pleasantville is 100. Test the hypothesis at a 95% confidence level. Explain.

Pearl Manufacturing Company provides glassware machines for major department store retailers. The company has been investigating a new piece of machinery for its production department. The old equipment has a remaining life of five years and the new equipment has a value of $239,400 with a five-year life. The expected additional cash inflows are $63,000 per year. What is the payback period for this investment?

• A. 2.5 years
• B. 4.5 years
• C. 3.8 years
• D. 5 years