MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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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 quarter is an indicator of what is ahead for the stock market and the economy. Use the sample data in the file StockQuarter to answer the following.
**Confidence Interval and Stock Price Change Analysis** **a. Estimating Percentage Change in Stock Price** Let \( d_i \) denote the percentage change in price per share for company \( i \), where: \[ d_i = \frac{\text{end of 1st quarter price per share} - \text{beginning of 1st quarter price per share}}{\text{beginning of 1st quarter price per share}} \] Use the sample mean of these values to estimate the percentage change in the stock price over the first quarter. Do not round intermediate calculations. Enter negative values as negative numbers, if any. Sample Answer: \(-0.06\) (to 3 decimals) – The answer is marked incorrect. **b. Calculating the 90% Confidence Interval** What is the 90% confidence interval estimate of the population mean percentage change in the price per share of stock during the first quarter? Do not round intermediate calculations. Enter negative values as negative numbers, if any. Confidence interval: \((0.1288, -0.011)\) (to 3 decimals) – Both values are marked incorrect. **Interpretation** The stock market experiences a decline in prices. **Feedback**: Partially Correct The problem involves calculation of the stock price change percentage and understanding of confidence intervals, highlighting concepts in statistics related to stock market analysis.
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Transcribed Image Text:**Confidence Interval and Stock Price Change Analysis** **a. Estimating Percentage Change in Stock Price** Let \( d_i \) denote the percentage change in price per share for company \( i \), where: \[ d_i = \frac{\text{end of 1st quarter price per share} - \text{beginning of 1st quarter price per share}}{\text{beginning of 1st quarter price per share}} \] Use the sample mean of these values to estimate the percentage change in the stock price over the first quarter. Do not round intermediate calculations. Enter negative values as negative numbers, if any. Sample Answer: \(-0.06\) (to 3 decimals) – The answer is marked incorrect. **b. Calculating the 90% Confidence Interval** What is the 90% confidence interval estimate of the population mean percentage change in the price per share of stock during the first quarter? Do not round intermediate calculations. Enter negative values as negative numbers, if any. Confidence interval: \((0.1288, -0.011)\) (to 3 decimals) – Both values are marked incorrect. **Interpretation** The stock market experiences a decline in prices. **Feedback**: Partially Correct The problem involves calculation of the stock price change percentage and understanding of confidence intervals, highlighting concepts in statistics related to stock market analysis.
The table below displays the stock prices of various companies at the beginning and end of the first quarter. This information can be used to analyze market trends and company performance over this period. | **Company** | **Beginning of 1st Quarter** | **End of 1st Quarter** | |------------------------------------|-----------------------------|-----------------------| | Bank of New York Mellon | 53.82 | 54.19 | | Kraft Foods | 77.02 | 55.70 | | E.I. du Pont de Nemours and Company| 109.00 | 102.57 | | Consolidated Edison | 83.58 | 79.95 | | Johnson & Johnson | 139.23 | 126.01 | | Union Pacific | 135.78 | 132.73 | | Comcast | 41.07 | 32.06 | | Applied Materials | 53.04 | 50.91 | | Pfizer | 36.44 | 35.40 | | General Electric | 17.98 | 14.05 | | AT&T | 38.54 | 32.54 | | Cisco Systems | 38.86 | 44.83 | | Home Depot | 188.03 | 184.63 | | JP Morgan Chase | 107.95 | 108.78 | | Procter & Gamble | 90.65 | 71.96 | | Verizon | 53.53 | 48.82 | | Devon Energy | 42.23 | 36.20 | | Lilly | 84.68 | 79.07 | | Microsoft | 85.95 | 95.00 | | Coca Cola | 45.59 | 42.59 | | Qualcomm | 65.20 | 50.82 | | Exxon Mobil Corporation | 85.03 | 76.95 | | PG&E Corporation | 44.49 | 46.27 | | Oracle Corporation | 46.63 | 45.95 | | Chevron | 127.58 |
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Transcribed Image Text:The table below displays the stock prices of various companies at the beginning and end of the first quarter. This information can be used to analyze market trends and company performance over this period. | **Company** | **Beginning of 1st Quarter** | **End of 1st Quarter** | |------------------------------------|-----------------------------|-----------------------| | Bank of New York Mellon | 53.82 | 54.19 | | Kraft Foods | 77.02 | 55.70 | | E.I. du Pont de Nemours and Company| 109.00 | 102.57 | | Consolidated Edison | 83.58 | 79.95 | | Johnson & Johnson | 139.23 | 126.01 | | Union Pacific | 135.78 | 132.73 | | Comcast | 41.07 | 32.06 | | Applied Materials | 53.04 | 50.91 | | Pfizer | 36.44 | 35.40 | | General Electric | 17.98 | 14.05 | | AT&T | 38.54 | 32.54 | | Cisco Systems | 38.86 | 44.83 | | Home Depot | 188.03 | 184.63 | | JP Morgan Chase | 107.95 | 108.78 | | Procter & Gamble | 90.65 | 71.96 | | Verizon | 53.53 | 48.82 | | Devon Energy | 42.23 | 36.20 | | Lilly | 84.68 | 79.07 | | Microsoft | 85.95 | 95.00 | | Coca Cola | 45.59 | 42.59 | | Qualcomm | 65.20 | 50.82 | | Exxon Mobil Corporation | 85.03 | 76.95 | | PG&E Corporation | 44.49 | 46.27 | | Oracle Corporation | 46.63 | 45.95 | | Chevron | 127.58 |
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