(a)With reference to your estimated equation, calculate (using a calculator) a 90%

confidence interval for the coefficient of X (i.e.?2 ) in the model. In performing this calculation, use the relevant estimated standard error of the estimator of the coefficient of X given in your summary Excel regression output. Give an interpretation of the confidence interval you calculate.

(2 marks)

(b)Again with reference to your estimated equation, perform a test of the null hypothesis that the coefficient of number of hours of preliminary training provided to a telemarketer ( ?2 ) equals zero against the alternative that it is greater than zero, using

the

? = 0.05

(i.e. 5%) level of significance. In presenting your answer to this

question you are required to use the 6-step hypothesis testing procedure given in the unit summary lecture notes. Again in answering this question, you should use the relevant estimated standard error of the estimator of the coefficient of X given in your summary Excel regression output.(3 marks)

Give an interpretation of the realized coefficient of determination value ( r 2 ) given in your summary Excel regression output.

AutoSave On . Assignment 2 ECON - Saved kim nguyen HATERS File Home Insert Draw Page Layout Formulas Data Review View Help Search Share Comments Calibri - 11 A A General Insert 2 AY Delete O Paste B I Cell E E Conditional Format as Sort & % 9 Ideas Formatting * Table . Styles Format Filter . Select Clipboard Font Alignment Number Styles Cells Editing Ideas Q24 X V fix B D E F G H J K L M N 0 P Q R S T U VA Marketer Hours of Training Sales Revenue X 105000 Format Shape 3 A W U U G F W V Q DO W a V UI LD N W A 6 D QI DO A A M N V W UI LD W DO UI MI O N N DO W A 150000 120000 105000 180000 D Fill 90000 90000 Line 210000 135000 . No line 135000 180000 Solid line 105000 Sale revenue . Gradient line 195000 300000 135000 250000 240000 .05000 225000 165000 1800 95000 ...."' 240000 200000 150000 120135050006000.... 120000 150000 120000 100000 0600..." y = 15000x + 60000 180000 150000 50000 195000 210000 0 120000 6 8 10 12 14 16 105000 240000 195000 135000 165000 150000 105000 180000 150000 165000 105000 225000 210000 135000 135000 105000 120000 Sheet1 Sheet2 + Enter + 77% Type here to search O W X 1:27 PM 26/05/2020