Decisions about alpha level may be different, especially as it relates from hard sciences to social sciences. For example, a medical trial for cancer treatments conducts their statistical tests at .0001 – so for every 1 out of 10,000 patients, there may be issues, sickness or even death. For social science, we use alpha .05. We are comfortable with performing research, for example, on students. So we are satisfied with losing 5 out of 100 students or having our results being incorrect 5 out of 100 times. Do you agree with these alpha levels? Why or why not? What if your child’s education and the teacher assigned to him/her would be successful 95 out of 100 times?

The time needed to complete a final examination in a particular college course is normally distributed with a mean of 79 minutes and a standard deviation of 8 minutes. Answer the following questions. Round the intermediate calculations for z value to 2 decimal places.

1. What is the probability of completing the exam in one hour or less (to 4 decimals)?
   
2. What is the probability that a student will complete the exam in more than 60 minutes but less than 75 minutes (to 4 decimals)?
   
3. Assume that the class has 60 students and that the examination period is 90 minutes in length. How many students do you expect will be unable to complete the exam in the allotted time (to the next whole number)?

I need to understand how to do this in excel.

The amount of time to complete a physical activity in a PE class is approximately normally normally distributed with a mean of 37.5 seconds and a standard deviation of 7.6 seconds

a) What is the probability that a randomly chosen student completes the activity in less than 30.6 seconds? Round to 4 decimal places.

b)What is the probability that a randomly chosen student completes the activity in more than 42.9 seconds? Round to 4 decimal places

c)What proportion of students take between 33.5 and 43.4 seconds to complete the activity? Round to 4 decimal places.

d) 90% of all students finish the activity in less than ____ seconds

Answer: 0.182

Answer: 0.2387

Answer: 0.4819

Answer: 47.2

Problem 3. Americans average 6.9 hours of sleep on weeknights, according to a report released in 2011 by the National Sleep Foundation. The Dean of Student Affairs at the College of the Canyons wondered if the average amount of sleep on weeknights is less for students at their college. She collected data from a survey of 90 randomly selected students at her college. Respondents averaged 6.4 hours of sleep a night with a standard deviation of 1.35 hours. Here is the Statcrunch calculator printout.

a. State the hypothesis using ?

H0:

Ha:

b.Verify that the conditions are met for using a t-distribution.

c.Calculate the standard error to verify the value provided by the Statcrunch output below.

d.Based on the calculated p-value, what is our conclusion?

The Scholastic Aptitude Test (SAT) contains three parts: critical reading, mathematics, and writing. Each part is scored on an -point scale. A sample of SAT scores for six students follows.

a. Using a .05 level of significance, do students perform differently on the three portions of the SAT?

Bob is worried that students’ scores on examinations differ significantly based on the paper colors of the examinations, on average. Bob conducts an Analysis of Variance in which he selects four examinations at random for each of four paper colors.

a. If the value for Sum of Squares Total equals 2,144 and the value for Mean Squares Within equals 135.5, what does the calculated value for the associated test statistic equal?

(a) 1.2743

(b) 0.7819

(c) 1.6238

(d) 15.8229

b. If the level of significance equals 0.05, can Bob conclude students’ scores on examinations differ significantly based on the paper colors of the examinations, on average?

(a) not w/out Turkey's HSD

(b) Not w/out Hypotheses

(c) yes

(d) no

Maximum Word Count 500 words

Essay 20 Marks

b) On Thursday, 4th June 2020, a group of students from University of Ghana Business School (UGBS) and the Department of Political Science were debating whether Management should be classified as a Science or an Art. The students from the Department of Political Science were of the view that Management is an Art whiles those from UGBS believed that it should be considered as a Science. A student from UGBS retorted: “You people even call Political Science a Science how much more management, what is really Science about your Politics?”. Based on this debate, do you think management is a Science or an Art? Give examples to support your argument.

Please do it by type not write.

1. Suppose that the publishers of a particular Economics book often used as a requirement in Economics classes raise the price from $40 to $60. Afterwards, they notice that the quantity demanded among college students dropped from 105 to 95, and the quantity demanded among casual readers dropped from 70 to 30.

a. Calculate the price elasticity of demand for students. Then calculate the price elasticity of demand for casual readers. (Note: in each case, the price change is the same).

b. Based on part a, how would you characterize demand for each group of buyers? Explain (briefly) why the elasticities differ.

c. Explain (briefly) how the publishers could use this information to maximize revenue.

The following data are the monthly salaries y and the grade point averages xfor students who obtained a bachelor's degree in business administration.

The estimated regression equation for these data is  = 358.6 + 1,028.6x and MSE =533,607. Use Table 1 of Appendix B.

a. Develop a point estimate of the starting salary for a student with a GPA of 3.0 (to 1 decimal).
$

b. Develop a 95% confidence interval for the mean starting salary for all students with a 3.0 GPA (to 2 decimals).
$ (  ,  )

c. Develop a 95% prediction interval for Ryan Dailey, a student with a GPA of 3.0 (to 2 decimals).
$ (  ,  )