Extensi ve monitoring of a computer time-sharing system has suggest ed that response time to a particular editing command is normally distributed with standard deviations of 35 milliseconds. A new oper ating system has been inst alled, and we wish to estimate the true average response time u for the new environment. Assuming that response times are still normally distributied with o = 35, what sample size is necessary to ensure that the reslting 95% confidence interval has a margin of error of at most 7?

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5.
Extensive monitoring of a computer time-sharing system has su ggest ed that response
time to a partic ul ar editing command is normally distributed with st andard de viations of 35
milliseconds. A new oper ating system has been inst alled, and we wish to estimate the true
average response time u for the new environment. Assuming that response times are still
normally distri butied with o = 35, what sample size is necessary to ensure that the reslting
95% confidence interval has a margin of error of at most 7?
Transcribed Image Text:5. Extensive monitoring of a computer time-sharing system has su ggest ed that response time to a partic ul ar editing command is normally distributed with st andard de viations of 35 milliseconds. A new oper ating system has been inst alled, and we wish to estimate the true average response time u for the new environment. Assuming that response times are still normally distri butied with o = 35, what sample size is necessary to ensure that the reslting 95% confidence interval has a margin of error of at most 7?
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