A manufacturer of cell phone batteries wants to estimate the useful life of its battery (in thousands of hours). The estimate is to be within 0.10 (100) hours. Assume a 95 per- cent level of confidence and that the standard deviation of the useful life of the battery is

0.90 (900 hours). Determine the required sample  size.

    • 10 years ago
    cell phone batteries
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      cell_phone_batteries.xlsx