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 ryan lell me what you want to do Home Insert Draw Page Layout Formula Data Review View L227 Document Recovery 0.990 190 Fxrrl has inco verrd the folloving files. Savr thr onas you wish to keep 191 None Available Files 192 Practi Test 3 Spr 2017 (versio, 193 16 You wish to estimate the average life of a type of light bulb with 95% Version created from the lastA.. 194 confidence limits. You plan to take a random sample of 25 bulbs and burn 4/9/2017 5:27 PM 195 them continuously until they burn out. Assume that the length of life is 196 normally distributed for all bulbs of this type. Given only the information in 197 your sample, what procedure would you use? 198 a. A confidence interval for the population mean using the Z distribution 199 200 b. A confidence interval for the population mean using the t distribution 201 A hypothesis test for the population mean using the Z distribution 202 A hypothesis test for the population mean using the t distribution 203 None 204 a 205 17 A telephone conpany wants to estimate, with (1-a)100% confidence, the 0.05 206 mean number of minutes people in a city spend talking on their cell phones h lile d 207 each day. From past records, an estimate of the standard deviation is "o" Close Test 3A Test 3B Test 3C cover shee a L 1 0:54 AM 58/2017

Explanation / Answer

Ans: Option b. (since n=25<30)   

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