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20 Suppose it is of interest to use the data sets in Exercises 1 24 and 1 25 to derive a model that would predict staff salaries as a function of percentage of families in a high income level for current school systems. Comment on any disadvantage in carrying out this type of analysis Reference Problem 1.25 The following data set is related to that in Exercise 1 24 It gives the percentages of the families that are in the upper income level, for the same individual schools in the same order as in Exercise 1.24. 72.2 31.9 26.5 29.1 273 8.6 223 26.5 20.4 12.8 25.1 19.2 24.1 58 2 68.1 59.2 55.1 9.4 14,5 139 207 17.9 65 554 38.1 542 21.5 262 50.1 (a) Calculate the sample mean. (b) Calculate the sample median. (c) Construct a relative frequency histogram of the data. (d) Compute the 10% trimmed mean. Compare with the results in (a) and (b) and comment Reference: Problem 1.24: The following are historical data on staff salaries (dollars per pupil) for 30 schools sampled in the eastern part of the United States in the early 1970s. 3.79 290 277 291 310 181 232 322 2.45 214 267 252 271 275 357 385 136 205 289 281 313 241 2,10 371 3.14 154 2:37 268 151 137 (a) Compute the sample mean and sample standard deviation (b) Construct a relative frequency histogram of the data