Question

In: Statistics and Probability

The human resources department of a consulting firm gives a standard creativity test to a randomly...

The human resources department of a consulting firm gives a standard creativity test to a randomly selected group of new hires every year. This year, 80 new hires took the test and scored a mean of 112.9 points with a standard deviation of 13.8. Last year, 60 new hires took the test and scored a mean of 117.1 points with a standard deviation of . 15.3 Assume that the population standard deviations of the test scores of all new hires in the current year and the test scores of all new hires last year can be estimated by the sample standard deviations, as the samples used were quite large. Construct a 95% confidence interval for µ1-µ2 , the difference between the mean test score µ1 of new hires from the current year and the mean test score µ2 of new hires from last year. Then complete the table below.

Carry your intermediate computations to at least three decimal places. Round your answers to at least two decimal places.

What is the lower limit of the 95% confidence interval?
What is the upper limit of the 95% confidence interval?

Solutions

Expert Solution


Related Solutions

A manager in the human resources department randomly selected five employees files and recorded the following...
A manager in the human resources department randomly selected five employees files and recorded the following data on X = number of weeks of paid vacation (annually) and Y = number of sick days claimed by the employee in the previous year. An analysis of the linear relationship between X and Y is desired. a) Find the value of b0 and b1 b) Find the regression equation c) Interpret the meaning of the Y intercept b0 d) Predict the number...
How the Human Resources Department rewards the employees?
How the Human Resources Department rewards the employees?
The Legal Department (LE) and Human Resources Department (HR) of the XXX Corporation support the operations...
The Legal Department (LE) and Human Resources Department (HR) of the XXX Corporation support the operations of Divisions A and B of the XXX Corporation. The total cost incurred by the Legal Department in supporting A and B is $2,000,000. The total cost incurred by the Human Resources Department in supporting A and B is $10,000,000. The Legal Department devotes 400 Person-Hours (PH) to support Division A, 600 PH to support division B, and 100 PH to support the Human...
How would a human resources department use information in the operating budgets?
How would a human resources department use information in the operating budgets?
The Human Resources Department of a company conducts a survey to determine if a new medical...
The Human Resources Department of a company conducts a survey to determine if a new medical insurance plan is viewed favorably. Out of 200 employees surveyed 80 said they liked the change.    a. Calculate a 95% confidence interval for the population proportion who view the change favorably. b. What is the proper interpretation of the interval constructed in Part a? i. There is a 95% chance that the population proportion lies within the constructed interval. ii. If 20 similar...
The human resources department of a major corporation announced that the number of people interviewed by...
The human resources department of a major corporation announced that the number of people interviewed by the corporation in one month has a mean of 108 and a standard deviation, σ, of 15. The management of the corporation suspects that the standard deviation differs from 15. A random sample of 17 months had a mean of 113 interviews, with a standard deviation of 9. If we assume that the number of people interviewed by the corporation in one month follows...
Personnel will be recruited through a talent examination for the human resources department of a business....
Personnel will be recruited through a talent examination for the human resources department of a business. The scores of 200 people who took the exam are grouped between 300 and 1000 points as follows. (35 Points) Points Number of Students 300--400 15 400–500 25 500--600 30 600--700 60 700--800 40 800–900 20 900--1000 10 a) Which score did less than 100 people take the exam? b) What is the highest score among the exam takers? c) Which score of the...
The human resources department of a very large organisation is trying to determine the proportion of...
The human resources department of a very large organisation is trying to determine the proportion of all employees that are satisfied with their current position. They randomly select 121 employees and ask them: "Are you satisfied with your current position?" 61 replied yes they were. Construct a 95% confidence interval to estimate the true proportion of all employees at this workplace who were satisfied with their position. A 95% confidence interval for the true proportion of all employees at this...
Consider the following statements about service department costs: I. The costs of the Human Resources Department...
Consider the following statements about service department costs: I. The costs of the Human Resources Department in a manufacturing organization must be allocated to production departments in order to achieve a correct costing of inventory. II. The allocation of service department costs requires that an organization select both an allocation base and an allocation method. III. Service department cost allocations are more relevant for firms involved in service industries (e.g., repair, health care) than for those involved with manufacturing. Which...
A math department gives all college algebra students a test to test rather or not students...
A math department gives all college algebra students a test to test rather or not students taking college algebra on site perform better on Final than students that take class completely online. The Math department gathers random samples of 40 on-site students (Students who take class in the classroom) and 35 online students. The test score for each student in the random sample is determined. The mean score for the on-site students is 75, with a standard deviation of 12....
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT