The price per share of stock for a sample of 25 companies was recorded at the beginning of 2012 and then again at the end of the 1st quarter of 2012 . How stocks perform during the 1 st quarter is an indicator of what is ahead for the stock market and the economy. The sample data are provided in the Excel Online file below. Construct a spreadsheet to answer the following questions. Due to a recent change by Microsoft you will need to open the XLMiner Analysis ToolPak add-in manually from the home ribbon. Screenshot of ToolPak a. Let di denote the change in price per share for company i where di=1 st quarter of 2012 price per share minus the beginning of 2012 price per share. Use the sample mean of these values to estimate the dollar amount a share of stock has changed during the 1 st quarter $ (to 2 decimals) b. What is the 95% confidence interval estimate of the population mean change in the price per share of stock during the first quarter? Interpret this result. Standard deviation (to 2 decimals): Confidence interval (to 2 decimals):( ) The mean price per share has increase between % and % over the threemonth period (to 1 decimal). The price per share of stock for a sample of 25 companies was recorded at the beginning of 2012 and then again at the end of the 1st quarter of 2012 . How stocks perform during the 1 st quarter is an indicator of what is ahead for the stock market and the economy. The sample data are provided in the Excel Online file below. Construct a spreadsheet to answer the following questions. Due to a recent change by Microsoft you will need to open the XLMiner Analysis ToolPak add-in manually from the home ribbon. Screenshot of ToolPak a. Let di denote the change in price per share for company i where di=1 st quarter of 2012 price per share minus the beginning of 2012 price per share. Use the sample mean of these values to estimate the dollar amount a share of stock has changed during the 1 st quarter $ (to 2 decimals) b. What is the 95% confidence interval estimate of the population mean change in the price per share of stock during the first quarter? Interpret this result. Standard deviation (to 2 decimals): Confidence interval (to 2 decimals):( ) The mean price per share has increase between % and % over the threemonth period (to 1 decimal)