A pharmaceutical company wants to estimate the mean life of a particular drug under typical weather conditions. Following results were obtained from a simple random sample of 64 bottles of the drug: Sample mean Population standard deviation Sample size Find an interval estimate with a confidence level of (i) 90%, (ii) 95% and (ii) 99%. : 20 months :3 months :64

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A pharmaceutical company wants to estimate the mean life of a particular drug under typical weather
conditions. Following results were obtained from a simple random sample of 64 bottles of the drug:
Sample mean
Population standard deviation
Sample size
Find an interval estimate with a confidence level of (i) 90%, (ii) 95% and (ii) 99%.
:20 months
:3 months
:64
Transcribed Image Text:A pharmaceutical company wants to estimate the mean life of a particular drug under typical weather conditions. Following results were obtained from a simple random sample of 64 bottles of the drug: Sample mean Population standard deviation Sample size Find an interval estimate with a confidence level of (i) 90%, (ii) 95% and (ii) 99%. :20 months :3 months :64
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