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A conservative investor would like to invest some money in a bond fund. The investor is concerned about the safety of her principal (the original money invested).

Colonial Funds claims to have a bond fund which has maintained a consistent share price of $10. They claim that this share price has not varied by more than $0. 25 on

average since its inception. To test this claim, the investor randomly selects 29 days during the last year and determines the share price for the bond fund. The average

share price of the sample is $10 with a standard deviation of S0. 4. Assuming that the share prices of the bond fund have an approximately normal distribution,

construct a 98% confidence interval for the standard deviation of the share price of the bond fund.

Round any intermediate calculations to no less than six decimal

places and round the endpoints of the interval to four decimal places

Sagot :

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