The price per share of stock for a sample of 25 companies was recorded at the beginning of the first financial quarter and then again at the end of the first financial quarter. How stocks perform during the first financial quarter is an indicator of what is ahead for the stock market and the economy. Company End of 1st quarter Beginning of 1st quarter Bank of New York Mellon 54.19 53.82 Kraft Foods 55.70 77.02 E.I. du Pont de Nemours and Company 102.57 109.00 Consolidated Edison 79.95 83.58 Johnson & Johnson 126.01 139.23 Union Pacific 132.73 135.78 Comcast 32.06 41.07 Applied Materials 50.91 53.04 Pfizer 35.40 36.44 General Electric 14.05 17.98 AT&T 32.54 38.54 Cisco Systems 44.83 38.86 Home Depot 184.63 188.03 JP Morgan Chase 108.78 107.95 Procter & Gamble 71.96 90.65 Verizon 48.82 53.53 Devon Energy 36.20 42.23 Lilly 79.07 84.68 Microsoft 95.00 85.95 Coca Cola 42.59 45.59 Qualcomm 50.82 65.20 Exxon Mobil Corporation 76.95 85.03 PG&E Corporation 46.27 44.49 Oracle Corporation 45.95 46.63 Chevron 129.86 127.58 (a) Let di denote the percentage change in price per share for company i where di = end of 1st quarter price per share − beginning of 1st quarter price per share beginning of 1st quarter price per share . Use the sample mean of these values to estimate the percentage change in the stock price over the first quarter. (Round your answer to one decimal place.) % (b) What is the 95% confidence interval estimate of the population mean percentage change in the price per share of stock during the first quarter? (Round your answers to one decimal place.) % to % Interpret this result. Because the 95% confidence interval zero, we can be 95% confident that the population mean percentage change in the price per share of stock

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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The price per share of stock for a sample of 25 companies was recorded at the beginning of the first financial quarter and then again at the end of the first financial quarter. How stocks perform during the first financial quarter is an indicator of what is ahead for the stock market and the economy.

Company	End of 1st quarter	Beginning of 1st quarter
Bank of New York Mellon	54.19	53.82
Kraft Foods	55.70	77.02
E.I. du Pont de Nemours and Company	102.57	109.00
Consolidated Edison	79.95	83.58
Johnson & Johnson	126.01	139.23
Union Pacific	132.73	135.78
Comcast	32.06	41.07
Applied Materials	50.91	53.04
Pfizer	35.40	36.44
General Electric	14.05	17.98
AT&T	32.54	38.54
Cisco Systems	44.83	38.86
Home Depot	184.63	188.03
JP Morgan Chase	108.78	107.95
Procter & Gamble	71.96	90.65
Verizon	48.82	53.53
Devon Energy	36.20	42.23
Lilly	79.07	84.68
Microsoft	95.00	85.95
Coca Cola	42.59	45.59
Qualcomm	50.82	65.20
Exxon Mobil Corporation	76.95	85.03
PG&E Corporation	46.27	44.49
Oracle Corporation	45.95	46.63
Chevron	129.86	127.58

(a)

Let d_i denote the percentage change in price per share for company i where

d_i =

end of 1st quarter price per share − beginning of 1st quarter price per share

beginning of 1st quarter price per share

Use the sample mean of these values to estimate the percentage change in the stock price over the first quarter. (Round your answer to one decimal place.)

(b)

What is the 95% confidence interval estimate of the population mean percentage change in the price per share of stock during the first quarter? (Round your answers to one decimal place.)

% to %

Interpret this result.

Because the 95% confidence interval zero, we can be 95% confident that the population mean percentage change in the price per share of stock .

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