A weight loss program is announced by Health fitness centre claiming weight loss for sure. A random sample of eight recent participants showed the following weights before and after completing the course. At the 0.01 significance level, can we conclude the students lost weight?

(a) State the null hypothesis and the alternative hypothesis.

(b) What is the critical value of t?

(c) What is the computed value of t?

(d) Interpret the result. What is the p-value?

(e) What assumption needs to be made about the distribution of the differences?

7. Philip wants to take a speed-reading course, but his wife thinks that it is a waste of time. To convince her that the course will really change the way that he reads, Philip decides to conduct an informal study. He pols seven people, asking them to tell the number of pages they were able to read in an hour before and then after they took the course. The results he obtained are found in the following table. Construct and interpret a 95% confidence interval for the true mean increase in reading speeds for people who have taken the speed-reading course. Round your CI limits to 1 decimal place.

Number of pages read in one hour

Before Course: 35 50 45 50 60 70 65

After Course : 50 60 80 70 85 100 90

During the titration of a particular acid, the PH changes from 7.0 to 9.0 with the addition of 0.01mL of base. An indicator was used that had KI= 1.0x10-8. Calculate the ratio of basic to acidic forms of the indicators before and after the last 0.01mL of base was added. Use the result of your calculation to explain why this would or would not be a good indicator for this titration compared to phenolpthhalein.

a. I got PH change, then need to multply by 0.01ml of base. But why? What is that number called?

b. Need to calculate ratio of basic to acidic forms of the indicator before and after the last 0.01ml of base was added. I need precise steps of calculation with explainations.

c. How can I use my calculation to explain that the indicator used is good or bad for the experiment? Pleas explain.

The table below shows the number of hours per day 11 patients suffered from headaches before and after 7 weeks of soft tissue therapy. At α =​0.01, is there enough evidence to conclude that soft tissue therapy helps to reduce the length of time patients suffer from​ headaches? Assume the samples are random and​ dependent, and the population is normally distributed. USE THE CRITICAL REGION METHOD

Patient: 1 2 3 4 5 6 7 8 9 10 11

Daily Headache HRS.( Before) 3.1 , 2.6 , 3.6 , 3.9, 1.8 , 3.3 , 3.8, 1.8 , 2.5, 3.9 , 1.6

Daily Headache HRS.(After) 1.8 , 1.8, 1.4 , 2.2, 1.2 , 2.4 ,3.0 ,1.3 , 1.6 , 1.3, 1.1

9.The following relations describe monthly demand and supply for a computer support service catering to small businesses.

Q_d= 3000 – 10P

Q_s= -1000 + 10P

What is the autarky price and quantity produced?

What is the Welfare of the country as a whole before trade? ________________

If the world Price is $250, is this country a net importer or exporter? _________

And by how much? _________

What is the welfare of the country after trade? ____________

What is the net gain from trade?

10. The following relations describes the demand and supply for good x..

Q_d= 100 – 20P

Q_s= 20 + 20P

What is the autarky price and quantity produced?

What is the Welfare of the country as a whole before trade?

If the world Price is $1, is this country a net importer or exporter?

And by how much?

What is the welfare of the country after trade?

What is the net gain from trade? __________

five individuals with high blood pressure were given a new drug to see if it would lower their blood pressure. systolic blood pressure was measured before and after treatment for each individual. the results are below.

before: person 1= 170 person 2= 164 person 3= 168 person 4= 158 person 5= 183

after: person 1= 145 person 2= 132 person 3= 129 perosn 4= 135 perosn 5= 145

construct a 95% confidence interval for mean reduction in systolic blood pressure, round to one decimal place.

perform a hypothesis test at a 0.05 level on significance to determine if treatment for each individual. what is the pvalue round to the fourth decimal place.

do you reject the null, fail to reject the null or accept the null.

The tbl_employee contains information about the employee and its department, and it contains the following fields (it is possible to also include other missing fields): employee_id, employee_gender ,employee_salary, employee_annual_sallary, department_name, department_location, department head.

Make use of the database normalization skills learned to normalize a database to the third normalization form. Organize the columns and tables to reduce data redundancy and arrange attributes based on the relationships.

• Provide a screen shot of the database design before the normalization. Create a heading titled “Database Before Normalization.”
• Provide a screen shot of the database design after the normalization. Create a heading titled “Database After Normalization.”
• In more than 400 words, describe the three normalization forms and the guidelines for transforming from lower normal forms to higher normal forms.

A federal watchdog is investigating an advertising claim that a certain device reduces gasoline consumption in cars. Seven devices have been tested and installed in cars belonging to the institution. To compare performance under standard conditions, the miles each car travels with a gallon of gasoline are measured in both situations, before and after installation.

Would you say that the federal monitoring body has conclusively proven that the device has no effect on the performance of cars?

Formulate the appropriate null hypothesis and alternative, with a α = 0.025. Your work should have detailed procedure and appropriate analysis.

Refi Corporation is planning to repurchase part of its common stock by issuing corporate debt. As a result, the firm’s debt-equity ratio is expected to rise from 35 percent to 50 percent. The firm currently has $3.1 million worth of debt outstanding. The cost of this debt is 8 percent per year. The firm expects to have an EBIT of $1.3 million per year in perpetuity and pays no taxes. A.) What is the market value of the firm before and after the repurchase announcement? B.) What is the expected return on the firm’s equity before the announcement of the stock repurchase plan? C.) What is the expected return on the equity of an otherwise identical all-equity firm? D.) What is the expected return on the firm’s equity after the announcement of the stock repurchase plan?