Please show all work as I need to work these out with a calculator and tables on

Question

Please show all work as I need to work these out with a calculator and tables on the test.

Final 3ABC ected View Excel File Home Insert Draw Page Layout Formulas Data Review view Q lell me what you want to do L227 A B Document Recovery 205 17 A telephone conpany wants to estimate, with (1-a)100% confidence, the Fxrrl has renovered the following filrs. Savr thr 206 mean number of minutes people in a city spend talking on their cell phones ones you wish to keep Available Files 207 each day. From past records, an estimate of the standard deviation is "a" 3 Spr 2017 (versio, Practi minutes (shown on right). What is the required sample size to estimate the 208 Version created from the lastA.. 209 true mean within B (given on right). Assume the length of calls is normally 4/9/2017 5:27 PM 210 distributed 11 a. 22 212 213 214 C. 23 215 16 o? which liles do want to save? None Test 3A Test 3B Test 3C cover sheet a ryan r 0.05 0:54 AM L 1 58/2017

Explanation / Answer

= 12

Z for 95% confidence interval = Z0.975 = 1.96

Margin of error = 5

Margin of error = Z0.975 * / sqrt(n)

or, 5 = 1.96 * 12 / sqrt(n)

or, sqrt(n) = 1.96 * 12 / 5

or, sqrt(n) = 4.704

or, n = 22.1276

or, n = 22

Option-A) 22

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