Question

QUESTION 14 A new light bulb is being considered fon use in an office with computers It is decided that the new bulb will unly be used if il has a mcan lifetime of more than 500 hours A random sample of 40 bulbs is selected and plaresi on life test. The mean and standard deviation are found to be 505 hours and 18 hours, respectively. Perfuri the appropriate test of hypothesis to detem?me whether the new bulb should be used. Use a 0 011evel or signiGeimre C A. 2 tailri O P.1 tailed left C Cntaled O D.1 tailed right QUESTION 15 A rnew light bulb ss heing usidud for usc un an ottice with comp?uters It is decided that thr new hulb iwill only be useid if il has a mean lifrtitne of morc than s00 honrs Aandam sarmple nf 10 talha is selestral and placed on life test The ucan and stanidari deriam on are found to be 505 hours and 18 hours, sespectivcly What type of test would be sed to determine whether the new bulb shouli be uso? ? C A. T lest O t . T test for 'he diferente helieen w O D,2 test Cich Sone An answers to sqre cil snsicers Save AllA Sove and Subznit to saue and swoni

Answer 1