research methods for the behavioral sciences 5th edition pdf Chapter 8

Identify the main features of a between subject design. Describe one positive and one negative aspect of a between subject design.

Describe two threats to internal validity which can arise with the control group when using a between subject design.

Identify the advantage of using a multiple (3+) group design.

Suppose 44% of recent college graduates plan on pursuing a graduate degree. Twenty six recent college graduates are randomly selected.

a. What is the probability that no more than seven of the college graduates plan to pursue a graduate degree? (Do not round intermediate calculations. Round your final answers to 4 decimal places.)

b. What is the probability that exactly thirteen of the college graduates plan to pursue a graduate degree? (Do not round intermediate calculations. Round your final answers to 4 decimal places.)

c. What is the probability that at least ten but no more than fourteen of the college graduates plan to pursue a graduate degree? (Do not round intermediate calculations. Round your final answers to 4 decimal places.)

A.) Find the regression​ equation, letting the first variable be the predictor​ (x) variable. Using the listed​ actress/actor ages in various​years, find the best predicted age of the Best Actor winner given that the age of the Best Actress winner that year is 34 years. Is the result within 5 years of the actual Best Actor​ winner, whose age was 52 years?

find the equation of the regression line.

Graph the regression line on the scatterplot. In this​ case, the regression line does not fit very well because the data do not appear to be linear.

Use the regression equation for predictions only if the linear correlation coefficient r indicates that there is a linear correlation between the two variables. Use technology to calculate the linear correlation​ coefficient, rounding to three decimal places. what is r=

p-value:

x and y overbary.:

B.) Different hotels in a certain area are randomly​ selected, and their ratings and prices were obtained online. Using​ technology, with x representing the ratings and y representing​ price, we find that the regression equation has a slope of 130 and a​ y-intercept of −356. Complete parts​ (a) and​ (b) below.

a. What is the equation of the regression​ line? Select the correct choice below and fill in the answer boxes to complete your choice.

b.  What does the symbol ŷ with caret ​represent? (choose the correct answer from 1-4)

1.The symbol ŷ with caret represents the average price of hotels in the area.

2.The symbol ŷ with caret represents the expected price when the​ hotel's rating is 0.

3.The symbol ŷ with caret represents the predicted value of price.

4.The symbol ŷ with caret represents the amount that price increases with a​ 1-point increase in rating.

c.) Use the given data to find the equation of the regression line. Examine the scatterplot and identify a characteristic of the data that is ignored by the regression line. (draw scatterplot)

y^ = __ + ___ x (round to 2 decimal places as needed)

b1=

The intercept formula contains the means of x and y. Find each mean by dividing ∑x and ∑y by​ n, rounding to six decimal places as needed.

-x=

-y=

b0=

8. You are the attorney for one of the parents of one of the victims of the Columbine massacre. The parent’s name is Jim. Jim’s wife has fallen both physically and mentally ill since the incident. She is unable to work or care for their 4 year old daughter. The daughter has exhibited many signs of childhood depression and is often sick. The father’s job has been severely affected by his own grief and depression. He often has to call in sick to care for his wife and daughter.

He needs financial assistance to help pay medical bills and in- home- care for his wife and daughter. He has fallen behind in his mortgage payments and fears losing the house. He may lose his job. He has come to your law office to seek assistance.

a. What can we do to help? Is there a cause of action here?

b. Is there a person or persons who were negligent?

c. Discuss this situation as completely as you can.

Be sure to include the elements of the cause of action and a discussion of how you would prove up the facts relevant to each element. If you need to look up some facts on the Columbine massacre, you may do so.

What percent of undergraduate enrollment in coed colleges and universities in the United States is male? A random sample of 50 such institutions give the following data (Source: USA Today College Guide).

For this problem, use five classes.

(a) Find the class width.

(b) Make a frequency table showing class limits, class boundaries, midpoints, frequencies, relative frequencies, and cumulative frequencies.

(c) Draw a histogram.

(d) Draw a relative-frequency histogram.

(e) Categorize the basic distribution shape.

(f) Draw an ogive.

Hotelling’s location game. Recall the voting game discussed in class. There are two candidates, each of whom chooses a position from the set S = (1,2,...10). The voters are equally distributed across these ten positions. Voters vote for the candidate whose position is closest to theirs. If the two candidates are equidistant from a given position, the voters at that position split their votes equally. First, unlike in the game analyzed in class, assume that both candidates only care about winning or losing, not about the winning margin. Let the payoff for winning be 100 and the payoff for losing be 0. A tied election yields a payoff of 50.

(a) Find all strategies that strictly dominate strategy 10, and all strategies that weakly dominate 10. Explain your answer.

Next, switch back to the payoff functions we considered in class (candidates care about vote shares) but assume that there are three candidates, instead of two.

(b) Is strategy 10 dominated, strictly or weakly, by strategy 9? How about by strategy 8? Explain.

8. A professor tests whether the loudness of noise during an exam (low, medium, and high) is independent of exam grades (pass, fail). The following table shows the observed frequencies for this test.

Part A) Conduct a chi-square test for independence at a 0.05 level of significance. (Round your answer to two decimal places.)

Decide whether to retain or reject the null hypothesis.

Part B) Compute effect size using Cramer's V. (Round your answer to two decimal places.)

9. What is Cramer's V for each of the following values for the chi-square test for independence? (Round your answers to two decimal places.)

Part A) X² = 3.63, n = 50, df_smaller = 1

Part B) X² = 9.27, n = 120, df_smaller = 2

Part C) X² = 12.23, n = 160, df_smaller = 3

Please add the explanation.

3.A project costs $475 and has cash flows of $100 for the first three years and $75 in each of the project's last five years. If the discount rate is 10%, what is the discounted payback period?

A) The project never pays back on a discounted basis

B) 5 years

C) 6 years

D) 7 years

E) 8 years

Suppose 44% of politicians are lawyers.

If a random sample of size 411 is selected, what is the probability that the proportion of politicians who are lawyers will differ from the total politicians proportion by less than 7%? Round your answer to four decimal places.

1. This study (work sampling*) is focusing on machine operations. Using the following data,

1. Categorize the events into the interesting activities such as machine idle (I), machine servicing (S).

   Observed Data	Categorize         √ S (Service) I (Idle)	Number of Observation
   Machine Running	S or I	222
   Remove Scrap	S or I	48
   Change tool	S or I	17
   Change material	S or I	60
   Adjust die	S or I	23
   Wait for maintenance service	S or I	53
   Wait for next material	S or I	25

2. What % (p) of the time Machine is down (not idle but “serviced by the operator”) roughly?
3. An analyst determined that the machining time (Tm) per piece was 40min. What is the actual production for the one machine supervised by one operator for an 8-hour shift given the above conditions?
4. What is the unit cost ? The operator is paid $10.00/hr and each machine costs $20.00/hr for power and supplies.
5. Since there is so much lost production due to idle time, management is considering assigning another machine to the first operator. There are three approaches or choices: i) Assign Machines #1 to the first operator and Machines #2 to the second operator, or ii) have both operators help each other and service all two machines as needed. iii) Assign Machines #1 and #2 to the first operator and don’t assign a second operator. Which choice is best, i.e. lowest unit cost?