according to the research institution, men spent an average of $133.06 on Valentine's Day gifts in 2009. Assume the standard deviation for this population is $40 and that it is normally distributed. A random sample of 15 men who celebrate Valentine's Day was selected. Complete parts a through e. E) identify the symmetrical interval

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according to the research institution, men spent an average of $133.06 on Valentine's Day gifts in 2009. Assume the standard deviation for this population is $40 and that it is normally distributed. A random sample of 15 men who celebrate Valentine's Day was selected. Complete parts a through e.  E) identify the symmetrical interval that includes 95% of the sample means of the true population mean is $133.06.

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