20 May The Concentration Of Active Ingredient In A Liquid Laundry Detergent Is Thoughtto Be Effected
1. The concentration of active ingredient in a liquid laundry detergent is thoughtto be effected by the type of catalyst used in the process. The standard deviation of active concentration is known to be 3 grams per liter, regardless of the catalyst type. Ten observations on concentration are taken with each catalyst, and the data are shown here: Catalyst 1: 66.1, 64.0, 64.4, 60.0, 65.3, 66.9, 61.5, 63.5, 61.6, 62.3Catalyst 2: 66.3, 64.7, 67.6, 68.5, 68.3, 67.4, 66.1, 69.9, 70.6, 68.7
(a) Find a 95% confidence interval on the difference in mean active concentrations for the two catalysts.
(b) Is there any evidence to indicate that the mean active concentrations depend on the choice of the catalyst? Base your answer on the results of part (a).
2. A new purification unit is installed in a chemical process. Before its installation, a random sample yielded the following data about the percentage of impurity: ¯x1 = 9.85, s21 = 6.79 and n1 = 10. After installation, a random sample resulted in ¯x2 = 8.08, s22 = 6.18, and n2 = 8.
(a) Can you conclude that the two variances are equal? (use α = 0.05).
(b) Can you conclude that the new purification device has reduced the mean percentage of impurity? (use α = 0.05).
Our website has a team of professional writers who can help you write any of your homework. They will write your papers from scratch. We also have a team of editors just to make sure all papers are of HIGH QUALITY & PLAGIARISM FREE. To make an Order you only need to click Ask A Question and we will direct you to our Order Page at WriteDemy. Then fill Our Order Form with all your assignment instructions. Select your deadline and pay for your paper. You will get it few hours before your set deadline.
Fill in all the assignment paper details that are required in the order form with the standard information being the page count, deadline, academic level and type of paper. It is advisable to have this information at hand so that you can quickly fill in the necessary information needed in the form for the essay writer to be immediately assigned to your writing project. Make payment for the custom essay order to enable us to assign a suitable writer to your order. Payments are made through Paypal on a secured billing page. Finally, sit back and relax.
About Writedemy
We are a professional paper writing website. If you have searched a question and bumped into our website just know you are in the right place to get help in your coursework. We offer HIGH QUALITY & PLAGIARISM FREE Papers.
How It Works
To make an Order you only need to click on “Order Now” and we will direct you to our Order Page. Fill Our Order Form with all your assignment instructions. Select your deadline and pay for your paper. You will get it few hours before your set deadline.
Are there Discounts?
All new clients are eligible for 20% off in their first Order. Our payment method is safe and secure.