4 The average daly volume of Motorola stock in 2000 was 1 14

4 The average daly volume of Motorola stock in 2000 was: 1 1.4 mion shares wth a standard deviation of a 83 milon shares, according to YahoolFinanee An analyst wants to know if things changed in 2004 Based on a random sample of 35 trading days in 2004, the sample mean number of shares vaded is found to be 133 mlion shares, y eldng a R5% conidence nierval (10 55, 16 05) fr average number of shares r, 2004 At the 5% level (conespording to 95% confidence), what should the analyst conclude? (1) Fai to teeth. -11 4 becouse 133 milon is in the cofidence neral (10 55, 1605) (2) Fai to reject Ha -11 4 because 11 4 mion is n the confidence itervel (1055, 1605) (3) Reject Ha = 11.4 because the confidence level 95% geater than a : 5% (4) Reject H. -11.4 because we found that -13 3 mien 5. Carl Reinhold August Wunderkch said that the mean temsereture of umins s SafE at the

Solution

since 11.4 lies within confidence interval. The correct choice is (2).