# During the manufacturing of commercial windows, hot steel ingots are passed though a rolling process and...

###### Question:

During the manufacturing of commercial windows, hot steel ingots are passed though a rolling process and flattened to a prescribed thickness. When the manufacturing process is working properly the ingots should have a mean thickness of 0.75 inches. A random sample of 40 ingots is taken and the mean was found to be 0.725 inches with a standard deviation of 0.092.

a. Find a 95% confidence interval for the population mean thickness.

b. Find the error bound.

c. Interpret the confidence interval in the words of the problem.

d. Is there evidence that the machine is not functioning properly? Justify!

#### Similar Solved Questions

##### 14 13. The life-cycle cost analysis includes (2.5 Points) Only indirect cost Both direct and indirect...
14 13. The life-cycle cost analysis includes (2.5 Points) Only indirect cost Both direct and indirect costs Neither direct cost nor indirect cost Only direct cost 19 Rate of return (ROR) is the rate paid on the (2.5 Points) Unpaid balance of spent money Paid amount of borrowed money Paid amount of s...
##### Portfolio Required Retur Suppose you manage a $3.94 million fund that consists of four stocks with... Portfolio Required Retur Suppose you manage a$3.94 million fund that consists of four stocks with the following investments: Stock Beta Investment $360,000 550,000 980,000 2,050,000 -0.50 1.25 0.75 If the market's required rate of return is 10% and the risk free rate is on what is the lund'... 1 answer ##### What is the capacitance of the empty shelves if they have area 0.375 m squared and... What is the capacitance of the empty shelves if they have area 0.375 m squared and are 0.205 m apart ? What is the voltage between the two shelves if opposite charges of magnitude 3.25 x 10^9 are placed on them ? Calculate the energy stored by having this charge on the two shelves Energy Stored ... 1 answer ##### Predict the oroduct of the following reaction series NH, HCI NaCN H07. heat NH, NH, COOH... predict the oroduct of the following reaction series NH, HCI NaCN H07. heat NH, NH, COOH NH, NH... 1 answer ##### What was the significance of Personal Liberty Laws in histroy what was the significance of Personal Liberty Laws in histroy... 1 answer ##### Question 23 For the foliowing P&ID SC Steam Heat Exchanger Process Flow_- Disturbance) The symbol of... Question 23 For the foliowing P&ID SC Steam Heat Exchanger Process Flow_- Disturbance) The symbol of the controller that compensate for the measured disturbances, due to the flow changes, is: The symbol of the controller, which considers the feedback and feedforward control inputs, is Where SC i... 1 answer ##### CILAT j. l-bromo-3-chlorocyclobutane 55. Which of the following has an asymmetric center? CHBryci BHFCI CH CHCI... CILAT j. l-bromo-3-chlorocyclobutane 55. Which of the following has an asymmetric center? CHBryci BHFCI CH CHCI CHFBCI BCHCI... 1 answer ##### .4. How would you describe the population growth of annual herbs compared to perennial herbs? Which... .4. How would you describe the population growth of annual herbs compared to perennial herbs? Which formula would be most suitable to describe each of their population growths? [2] DO TUO TOL29... 1 answer ##### The contribution margin ratio is 25% for Crowne Company and the break-even point in sales is... The contribution margin ratio is 25% for Crowne Company and the break-even point in sales is$220,000. If Crowne Company's target operating profit is $62,000, sales would have to be: Multiple Choice$282,000. $276,000.$468,000. $248,000.... 1 answer ##### Fill In the Blank Question 187 A corporation has a separate apart from its owners Fill In the Blank Question 187 A corporation has a separate apart from its owners... 2 answers ##### Digital Circuit Gate A LSTTL gate has an I_OL = 8 mA. How many standard TTL gates can this gate drive? The standard TTL gate has I_IL = -1.6 mA.... 1 answer ##### Case 2-9 Racially Charged Language Inhibits Inclusive Cultures Leaving home for the first time and going... Case 2-9 Racially Charged Language Inhibits Inclusive Cultures Leaving home for the first time and going off to college is an exciting and stressful time for tens of thousands of students across the U.S. each year. Leaving the familiarity of family, friends, and community behind and entering an ofte... 1 answer ##### A manufacturer of video games develops a new game over two years. This costs$830,000 per...
A manufacturer of video games develops a new game over two years. This costs $830,000 per year with one payment made immediately and the other at the end of two years. When the game is released, it is expected to make$1.00 million per year for three years after that. What is the net present value (...
Investors require a return of 14.8% per year to hold a stock. The stock currently does not pay any dividends and is expected to begin paying a dividend of $1.65 in 3 years from now, then the dividends are expected to grow forever at a constant rate of 8.0%. What's the stock price? A)$13.74 OB) ...