The CIO of an IT company would like to investigate how a software developer’s work experience (in number of years), professional certifications (number of certificates), and knowledge of various computer languages (number of programming languages) contribute to his/her work performance. The work performance is measured on the scale of 1 to 1000 so that the higher one’s score, the better his/her work performance. He collects data from 20 software developers in his company Years of experience Num of certificates Num of progLang Performance

Years of expiernce , number of certificates , number of prolong, performance

1 27 3 8 880

2 11 1 2 686

3 6 2 1 681

4 21 3 4 877

5 26 3 4 975

6 21 3 4 902

7 18 3 3 900

8 15 1 5 882

9 14 2 3 200

10 5 1 3 650

11 17 2 5 908

12 14 2 4 687

13 15 3 4 891

14 7 2 3 566

15 5 3 1 959

16 13 2 5 793

17 11 1 4 778

18 31 3 7 975

19 16 2 5 846

20 12 2 6 779.

Using the pivot table on this data what is the standard deviation for the performance of software developers who have. obtained 2 to certificates and know 3 programming languages?

a 117.4

b 67.3

c 56.9

d 258.80

we would like to create a regression model that would describe how performance depends on work experience, professional , certifications, and knowledge of varies computer languages.

what is the respond (or dependent) variable in this regression model

a performance

b employee id

c knowledge of computer languages

d work experience

e professional certifications

What is the value of r-squared of this regression model?

a .28

b .53

c .45

d .76

e .37

1. “The Long Tail”:
   1. A phenomenon whereby firms can make money by offering a limited selection
   2. Refers to the large number of products available through conventional retail stores
   3. A phenomenon heavily leveraged by Blockbuster in its competitive battles with Netflix.
   4. A phenomenon that leverages the fact that selection attracts customers, and that the Internet allows large-selection inventory efficiencies.                                                                                    
2. Which of the following statements is false?
   1. From an innovation standpoint, Netflix is considered an “early mover” in leveraging Internet technology to establish best-in-class brand strength.
   2. Collaborative filtering is a classification of software that monitors trends among customers, and then uses this data to personalize an individual customer’s experience.
   3. It is not possible to achieve scale in the streaming industry.
   4. Scale economies are achieved by firms that leverage the cost of an investment across increasing units of production.                                                                                                                                  
3. Which of the following statements about costs is true?
   1. Marginal costs are costs that do not vary according to the production volume.
   2. Fixed costs are costs associated with each additional unit produced.
   3. The marginal costs of digital goods are zero.
   4. There are some costs associated with digital distribution.                                                                              
4. Disintermediation:
   1. Removing an organization from a firm’s distribution channel.
   2. Expands the path between supplier and customer.
   3. Illustrated by the purchase of Comcast by NBC/Universal.
   4. In the video industry, it results in studios having to share revenue with third parties.                                        
5. Which of the following is not true of Netflix relative to most pay channels?
   1. Netflix is generally more expensive than pay channels.
   2. Netflix offers more programming than pay channels.
   3. Netflix is available in more countries worldwide than pay channels
   4. Netflix can stream to customers who do not have a cable TV subscription.                                            

A recent study of home internet access reported the following number of hours of internet access per month for a sample of 20 persons [3+4+4+2 points]. 74 81 83 72 76 71 63 66 68 78 76 66 87 54 82 86 90 98 58 92 (a) Use probability plot in MINITAB to check if data are approximately normally distributed. (b) Use MINITAB to construct a 90% confidence interval for the population mean score and interpret your result. (c) Use MINITAB to construct a 95% confidence interval for the population mean scores and interpret your result. (d) Compare part (b) and (c) and explain which confidence interval is narrower and why?

Two stocks has the following year-end stock prices and dividends:

Which stock has a higher annual average capital gain yield over the four years? Which stock has a higher average dividend yield?If T-bill rate is 2.0 percent, which stock has a higher average nominal risk premium based on the annual average total return?What are the two primary lessons learned from capital market history? Provide evidence

Thanks

3) A concession manager at Yankee Stadium wants to know how temperature affects beer sales. She took a sample of 10 games and recorded the number of beers sold and the temperature in the middle of the game. Temperature 80 68 78 79 87 74 86 92 77 84 Number of Beers 20533 1439 13829 21286 30985 17187 30240 87596 9610 28742

a. Draw a scatter plot of the data.

b. The manager estimates the regression equation to be: numberofbeers = −100, 678 + 1, 513 ∗ temperature Draw this on your scatter plot.

c. For one of the estimated points, indicate the residual with ei .

d. For that same point, indicate what part of the variation is explained by the model with ˆyi − y¯.

(1 point) A study was conducted to determine whether the final grade of a student in an introductory psychology course is linearly related to his or her performance on the verbal ability test administered before college entrance. The verbal scores and final grades for 10 students are shown in the table below. Student Verbal Score x Final Grade y 1 38 77 2 39 90 3 60 71 4 67 73 5 42 69 6 77 84 7 38 77 8 69 74 9 33 63 10 35 65 Find the following: (a) The correlation coefficient: r= (b) The least-squares line: ŷ = (c) Calculate the residual for the seventh student:

AM -vs- PM Test Scores: In my AM section of statistics there are 22 students. The scores of Test 1 are given in the table below. The results are ordered lowest to highest to aid in answering the following questions.

(a) The value of P₉₀ ---->

(b) Complete the 5-number summary.

1. The overnight lending rate is

a. the interest rate the banks charge one another on overnight loans, whereas the prime interest rate is the interest rate banks change on loans to their most creditworthy customers.

b. the interest rate the banks charge on loans to their most creditworthy customers, whereas the prime interest rate is the interest rate banks charge their largest and most preferred business customers.

c. the interest rate the banks charge on loans to their most creditworthy customers, whereas the prime interest rate is the interest rate banks charge one another on overnight loans.

d. the interest rate the Bank of Canada charges banks for a loan, whereas the prime interest rate is the interest rate banks charge their preferred customers.

2. The overnight lending rate is

a. lower than the prime interest rate because federal funds are loaned overnight.

b. higher than the prime interest rate because there are many alternative uses for the funds and opportunity costs must be accounted for.

c. nearly the same as the prime interest rate because they are both short term loans.

d. not comparable to the prime interest rate since the lenders are different.

3. Changes in the overnight lending rate and the prime interest rate closely track one another because

a. there are fewer prime rate reserves available for lending.

b. both rates are related to the relative scarcity or availability of reserves.

c. all interest rates will be equal whether the customers are banks, businesses, or households.

d. the Bank of Canada arranges this to be the case.