hi there just need help with these two if possible ?

H&R Block randomly selected tax returns it prepared this year and recorded the amount of the Federal tax refund each client received (a negative amount indicates that Federal taxes were owed). The sample data are given below. $5513, $6683, $6889, $2258, $2234, $1127, $3673, $5114, $3329, $731, $2250, $2934, $2528, $847, $2361, $1718, $2900, $3824, $4424, $2599, $1137, $5058, $3331, $3281 Estimate the mean Federal tax refund received this year by H&R Block clients using this sample and a 95% condence interval. Assume that the Federal tax refund amount is normally distributed. Express the condence interval both symbolically and verbally. According to a recent Pew Research Center survey, 231 out of 371 Americans surveyed with just a high school diploma and 543 out of 634 Americans surveyed with a college degree have read at least one book in the last 12 months. Based on these sample results and a 0.01 level of signicance, can one infer that the proportion of Americans who have read at least one book in the last 12 months is higher for those with a college degree than for those with just a high school diploma