Question

Use the numbers under the first pic instead of the ones on the first screen. please and thanks.

A cellular phone company monitors monthly phone usage. The following data represent the monthly phone use in minutes of one particular customer for the past 20 months. Use the given data to answer parts (a) and (b). 330 439 543 432 389 335 499 488 498 418 493 420 529 481 480 545 483 526 513 547 (a) Determine the standard deviation and interquartile range of the data. s- (Round to two decimal places as needed.) IQR- CType an integer or a decimal.) (b) Suppose the month in which the customer used 330 minutes was not actually that customer's phone. That particular month the customer did not use their phone at all, so 0 minutes were used. How does changing the observation from 330 to 0 affect the standard deviation and interquartile range? What property does this illustrate? The standard deviation RAM and the interquartile range What property does this illustrate? Choose the correct answer below. O Resistance Empirical Rule Weighted Mean Dispersion

Answer 1

__ ent - ). 350 +3११ - . .. -- 547 20 ५१.५ Sample vastance s² = Žlx-x) 2 ___ n-1 8020५.१ (१ 8- 422 1 , 305 Sample standard Deviation s=54221-305 ____s, 64.941513 S 64.772 Sorrel dade. : 330, 335, 3११, ५17 , ५२०, ५32 ५]१, ५१० , 481, 473, ५११ , ५१3 ,५१४, ५११, 513,526 521,543,545,5113 First Quartile is median of first half 0 426

of sccond half Third Quartile in median of dala :d2: 519.5 Interquartice range is TOR: 2 (0. - (93.5 T 93.5 © . " the standard dewation increases ] Iar will remains the same ] because rank of No. has not changed. - This shows | Resistance IOR is a measure that towards presence outliers I i because r Resistant