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# Mathcad - UF-ESI-6321-04-04 - UF-ESI-6321 UF-ESI.xmcd page...

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UF-ESI-6321 UF-ESI-6321-04-04.xmcd page 1 of 2 4.4 A company manufacturing stereo equipment claims that their personal CD player can be used for approximately t 8 hr := of continuous play when used with alkaline batteries. To provide this estimate, the company tested n 35 := CD players with new alkaline batteries and recorded the time at which the batteries in the players "lost power." The average time was X bar 8.3 hr := with a sample standard deviation of S 1.2 hr := (a) Construct a 95% confidence interval for the mean time until a new alkaline battery used in the CD player loses power. The value of n exceeds 30 which makes this analysis valid. Z 95 1.960 := uni03BC upper X bar Z 95 S n + := uni03BC upper 8.7 hr = uni03BC lower X bar Z 95 S n - := uni03BC lower 7.9 hr = Luther Setzer 1 NASA Pkwy E Stop NEM3, Kennedy Space Center, FL 32899

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