Sweetness of orange juice. Refer to the simple linear regression of sweetness index y and amount of pectin, x, for n = 24 orange juice samples, presented in Exercise 11.32

(p. 629). A 90% confidence interval for the mean sweetness index E(y) for each value of x is shown on the SPSS spreadsheet on the next page. Select an observation and interpret this interval.

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run sweet pectin lower90m upper90m 1 1 5.2 220 5.64898 5.83848 2 2 5.5 227 5.63898 5.81613 3 3 6.0 259 5.57819 5.72904 4 4 5.9 210 5.66194 5.87173 5 5 5.8 224 5.64337 5.82560 6 6 6.0 215 5.65564 5.85493 7 7 5.8 231 5.63284 5.80379 8 8 5.6 268 5.55553 5.71011 9 9 5.6 239 5.61947 5.78019 10 10 5.9 212 5.65946 5.86497 11 11 5.4 410 5.05526 5.55416 12 12 5.6 256 5.58517 5.73592 13 13 5.8 306 5.43785 5.65219 14 14 5.5 259 5.57819 5.72904 15 15 5.3 284 5.50957 5.68213 16 16 5.3 383 5.15725 5.57694 17 17 5.7 271 5.54743 5.70434 18 18 5.5 264 5.56591 5.71821 19 19 5.7 227 5.63898 5.81613 20 20 5.3 263 5.56843 5.72031 2222 21 21 5.9 232 5.63125 5.80075 22 22 23 24 555 5.8 220 5.64898 5.83848 5.8 246 5.60640 5.76091 5.9 241 5.61587 5.77454 SPSS output for Exercise 11.113 23 24