Ameson purchased an alarm system for his car during a promotion. He considered the price after the promotion to be very attractive. However, he later learned that the firm set an artificially high reference price for the alarm system just before the promotion to make the advertised sale price more attractive. Jameson just experienced .

Suppose a mutual fund qualifies as having moderate risk if the standard deviation of its monthly rate of return is less than 3%. a mutual-fund rating agency randomly selects 27 months and determines the rate of return for a certain fund. the standard deviation of the rate of return is computed to be 2.19%. is there sufficient evidence to conclude that the fund has moderate risk at the alpha equals 0.05 level of significance? a normal probability plot indicates that the monthly rates of return are normally distributed.