The trade volume of a stock is the number of shares traded on a given day. The data in the first accompanying table, in millions (so that 6.40 represents 6,400,000 shares traded), represent the volume of a certain stock traded for a random sample of 40 trading days in a certain year. A second random sample of 40 days in the same year resulted in the data in second accompanying table. Complete parts (a) through (d) below. Click here to view the data for the first sample Click here to view the data for the second sample. Click here to view the table of critical t-values
(a) Use the data from the first sample to compute a point estimate for the population mean number of shares traded per day in the year. A point estimate for the population mean number of shares traded per day in the year is 4.447 million. (Round to three decimal places as needed.)
(b) Using the data from the first sample, construct a 95% confidence interval for the population mean number of shares traded per day in the certain year. Interpret the confidence interval. Select the correct choice below and fill in the answer boxes to complete your choice (Round to three decimal places as needed.) ○
A. One can be % confident that the mean number of shares of the stock traded per day in the specified year is between | | million and million.
B. There is a | % probability that the mean number of shares of stock traded per day in the specified year is between million and million.
C The number of shares of the stock traded per day is between million and million for % of all days in the specified year. million and million
D. One can be % confident that the mean number of shares of the stock traded in all days of the specified year are between