A researcher would like to evaluate the effectiveness of a pain-relief patch designed for lower back pain. Prior to testing the patch, each of n = 8 patients rates the current level of back pain on a scale from 1 to 10. After wearing the patch for 90 minutes, a second pain rating is recorded. The data are as follows:

Before      After

                        6            2

                        8            3

                        9            4

                        8            1

                      10           2

                        5            3

                        9            8

                        7            7

What are the hypotheses for this study?

What is the df for this study?

What is the tcrit for this study?

What is the variance for this study?

What is the Est. S.E. for this study?

What is the Mean Difference for this study?

What is the tobt for this study?

Shira is a senior in high school and is struggling with her swim times. She goes to every practice offered, works hard, listens to her coaches, and makes the appropriate adjustments, yet she is making no improvements, meet after meet. For two years, Shira has been struggling with her times and continues to get frustrated. Before her meets, she is anxious, and after her meets, she beats herself up over her performances. Create a goal and explain how you will help Shira obtain it through practice and feedback schedules. Be very specific about practice and feedback schedules, and include a rationale for each based upon motor learning principles.

1. There is a new type of drug to alleviate migraines but some have wondered if it has some impact on users’ blood pressure. Ten people interested in taking the drug were randomly selected and their blood pressure was measured, and then measured again after using the drug five weeks later. Here are the data. Was there a significant change in blood pressure? Use a two-tailed test with α = .05 (t-Table is on p. 439).

According to the National Center for Health Statistics (2018), there were 3,855,500 births registered in the United States in the year 2017. The mean age of mothers at first birth was 26.8 years. Lets suppose that the standard deviation is 3 years. Use this information to answer questions #1 through #4.

Question 1

What proportion of first time mothers gave birth before the age of 18?

Question 2

What proportion of first time mothers gave birth after the age of 25

Question 3

What proportion of first time mothers gave birth between the ages of 20 and 30?

Question 4

What proportion of first time mothers gave birth after the age of 35?

Your Mini Project is going to be centered on an actual statistical study that you will design, conduct, and analyze.

Use excel, SPSS or a computer program of your choice to complete these exercises. Choose a variable that will permit the use of dependent samples.

For example, you might wish to see if a person’s weight has changed after diet. Select a sample of data (10 to 50) value pairs (e.g before and after), and then complete the following:

a. Purpose of the study.

b. Define population.

c. How were the sample selected?

d. State the hypothesis.

e. What was the test value?

f. Decision-making.

g. Write a paragraph summarizing the results.

Please help me.. and answer detail... thnk u

Two balls of mass 3.29 kg are attached to the ends of a thin rod of negligible mass and length 72 cm. The rod is free to rotate without friction about a horizontal axis through its center. A putty wad of mass 127 g drops onto one of the balls, with a speed 2.5 m/s, and sticks to it. What is the angular speed of the system just after the putty wad hits?

1.31×10^-1 rad/s

What is the ratio of the kinetic energy of the entire system after the collision to that of the putty wad before the collision (in percent)?

In a shooting field where noone can get hurt, there is a vertical square plastic board, 0.100 m on a side and with mass 0.800 kg , that rotates on a horizontal axis along its top edge. The center of the plastic board is hit by a bullet with mass 1.50 g that is moving with 300 m/s and that stays embedded in the plastic board.

a)Find the angular velocity of the plastic board right after the bullet's hit?

b)Calculate the maximum height above the equilibrium position does the center of the plastic board reach before starting to go back down again?

c)Find the minimum bullet velocity which would be required for the plastic board to swing all the way over after impact?

An object of mass

m₁ = 0.415 kg

starts from rest at point  and slides down an incline surface that makes an angle

θ = 36.0°

with the horizontal as shown. The coefficient of kinetic friction between the object and the incline surface is 0.455. After sliding down a distance d = 5.80 m, it makes a perfectly inelastic collision with an object of mass

m₂ = 0.645 kg

at point .

(a) Find the speed of

m₁

at point  just before the collision m/s

(b) Find the energy loss during the collision. Enter the magnitude.

J

(c) After the collision, the objects travel on a horizontal surface with a kinetic coefficient of 0.455. How long does it take until the objects come to rest at point ?.

  s

Consider the market for trinkets, where the demand and supply aregiven by the formulas:Demand :Quantity=100−PriceSupply :Quantity=−20+2∙Price (a) (10 points) Draw the demand and supply curves, and find the equilibriumprice and equilibrium quantity. (b) (10 points) Imagine that the government introduces a price cap of $30.Compare the consumer surplus before and after the cap is introduced.Are consumers better off or worse off? (c) (10 points) Imagine that now the price cap is reduced to $20. Comparethe consumer surplus after the new price cap with the consumer surpluswithout any cap. Are consumers better off or worse off?

please include an explanation of what steps you are taking to solve this problem thank you

An engineer is working on the layout of a new research and experimentation facility. Two plant operation will be required. If, however, an addition $100,000 of instrumentation and remote controls were added, the plant could be run by a single operato. The total before-tax cost of each plant operator is projected to be $35,000 per year. The instrumentation and controls will be depreciated by means of the modified accelerated cost recovery system (MACRS)

If this corporation (34% combined corporate tax rate) invests in additional instrumentation and controls, how long will take for after-tax benefits to equal the $100,000 cost? In other words what is the after-tax payback period?

NOTE: Please Use a net tax rate of 22.98% for the problem (disregard the rate given in the problem)