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	49.44

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?