ITEC 610 Exam 2

ITEC 610 Exam 2 | Assignment Help | Kogod School Of Business American University 

1 - A large group of students took a test in Physics and the final grades have a mean of 69 and a standard deviation of 9. If we can approximate the distribution of these grades by a normal distribution, what percent of the students

a)      Scored (49<grades<69)?

b)      Should pass the test (grades≥59)?

c)      Should fail the test (grades <59)? >

2- An insurance company states that 15% of all fire insurance claims are fraudulent. Suppose the company is correct, and that it receives 130 claims.

 a. What's the probability that at least 15 claims are fraudulent?

3- Fourteen users attempted to add a channel on their cable TV to a list of favorites. After the task, they rated the difficulty on the 7 point Single Ease Question. Compute the 95% confidence interval. The responses are shown below b. What's the probability that less than 10 claims are fraudulent?

3, 7, 5, 1, 7, 3, 6, 2, 7, 1, 5, 5, 1, 2 a.

Find the mean.

b. Find the standard deviation

c. Compute the standard error

d. Compute the margin of error.

e. Compute the confidence interval.

4- Discrete Random Variable: Bivariate Probability Distribution

 4- The bivariate probability distribution of X and Y is given in the table below.

a

 Are X and Y independent? Explain

b.       Calculate Cov(X,Y).