In early 2009, the economy was experiencing a recession. But how was the recessi
ID: 2455849 • Letter: I
Question
In early 2009, the economy was experiencing a recession. But how was the recession affecting the stock market? Shown are data from a sample of 15 companies. Shown for each company is the price per share of stock on January 1 and April 30
A) What was the change in the mean price per share of stock over the four month period?
B) Provide a 90% confident interval estiamte of the change in the mean price per share of stock. Interpret the results.
C) What was the percentage change in the mean price per share of stock over the four-motnh period?
D) If this same percentage change were to occur for the next 4 months and again for the 4 months after that, what would be the mean price per share of stock at the end of the year 2009?
Company January 1 ($) April 30 ($) Applied Materials 10.13 12.21 Bank of New York 28.33 25.48 ChevronTexaco 73.97 66.10 Cisco Systems 16.30 19.32 Coco Cola 45.27 43.05 Comcast 16.88 15.46 Ford Motors 2.29 5.98 General Electric 16.20 12.65 Johnson & Johnson 59.83 52.36 JP Morgan Chase 31.53 33.00 Microsoft 19.44 20.26 Oracle 17.73 19.34 Pfiser 17.71 13.36 Philip Morris 43.51 36.18 Procter & Gamble 61.82 49.44Explanation / Answer
Company January 1 ($) April 30 ($) Change in price Change in mean price % of change % of mean change Price in next four month Applied Materials 10.13 12.21 2.08 0.52 21% 5% 14.72 Bank of New York 28.33 25.48 -2.85 -0.7125 -10% -3% 22.92 ChevronTexaco 73.97 66.1 -7.87 -1.9675 -11% -3% 59.07 Cisco Systems 16.3 19.32 3.02 0.755 19% 5% 22.90 Coco Cola 45.27 43.05 -2.22 -0.555 -5% -1% 40.94 Comcast 16.88 15.46 -1.42 -0.355 -8% -2% 14.16 Ford Motors 2.29 5.98 3.69 0.9225 161% 40% 15.62 General Electric 16.2 12.65 -3.55 -0.8875 -22% -5% 9.88 Johnson & Johnson 59.83 52.36 -7.47 -1.8675 -12% -3% 45.82 JP Morgan Chase 31.53 33 1.47 0.3675 5% 1% 34.54 Microsoft 19.44 20.26 0.82 0.205 4% 1% 21.11 Oracle 17.73 19.34 1.61 0.4025 9% 2% 21.10 Pfiser 17.71 13.36 -4.35 -1.0875 -25% -6% 10.08 Philip Morris 43.51 36.18 -7.33 -1.8325 -17% -4% 30.08 Procter & Gamble 61.82 49.44 -12.38 -3.095 -20% -5% 39.54