In early 2009, the economy was experiencing a recession. But how was the recessionaffecting the stock market? Shown are data from a sample of 15 companies. Shown foreach company is the price per share...

In early 2009, the economy was experiencing a recession. But how was the recessionaffecting the stock market? Shown are data from a sample of 15 companies. Shown foreach company is the price per share of stock on January 1 and April 30 (The Wall StreetJournal, May 1, 2009).Company January 1 ($) April 30 ($)Applied Materials 10.13 12.21Bank of New York 28.33 25.48Chevron 73.97 66.10Cisco Systems 16.30 19.32Coca-Cola 45.27 43.05Comcast 16.88 15.46Ford Motors 2.29 5.98General Electric 16.20 12.65Johnson & Johnson 59.83 52.36JP Morgan Chase 31.53 33.00Microsoft 19.44 20.26Oracle 17.73 19.34Pfizer 17.71 13.36Philip Morris 43.51 36.18Procter & Gamble 61.82 49.44a. What is the change in the mean price per share of stock over the four-month period?b. Provide a 90% confident interval estimate of the change in the mean price per shareof stock. Interpret the results.c. What was the percentage change in the mean price per share of stock over the fourmonthperiod?d. If this same percentage change were to occur for the next four months and again forthe four months after that, what would be the mean price per share of stock at the endof the year 2009?