# Question

The trade volume of a stock is the number of shares traded on a given day. The following data, in millions (so that 6.16 represents 6,160,000 shares traded), represent the volume of PepsiCo stock traded for a random sample of 40 trading days in 2010.

(a) Use the data to compute a point estimate for the population mean number of shares traded per day in 2010.

(b) Construct a 95% conﬁdence interval for the population mean number of shares traded per day in 2010.Interpret the conﬁdence interval.

(c) A second random sample of 40 days in 2010 resulted in the data shown next.Construct another 95% conﬁdence interval for the population mean number of shares traded per day in 2010. Interpret the conﬁdence interval.

(d) Explain why the conﬁdence intervals obtained in parts (b) and (c) are different.

(a) Use the data to compute a point estimate for the population mean number of shares traded per day in 2010.

(b) Construct a 95% conﬁdence interval for the population mean number of shares traded per day in 2010.Interpret the conﬁdence interval.

(c) A second random sample of 40 days in 2010 resulted in the data shown next.Construct another 95% conﬁdence interval for the population mean number of shares traded per day in 2010. Interpret the conﬁdence interval.

(d) Explain why the conﬁdence intervals obtained in parts (b) and (c) are different.

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