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26. m A recent study of 25 students showed that they spent an average of $18.53 on gasoline per week 1with standard deviation of $3.00. Assume that the sample data are selected from a normally.r distributed population. {a} um What is the point estimate of the true mean of students' spending on gasoline per week? (b) Construct a 959i: Lndence interval of the true mean of st udents' spending on gasoline per week. Interpret this interval