The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 21.1 for a sample of size 727 and standard deviation 10.1. Estimate how much the drug will lower a typical patient's systolic blood pressure (using a 99% confidence level). Enter your answer as a tri-linear inequality accurate to one decimal place (because the sample statistics are reported accurate to one decimal place).

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The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 21.1 for a sample of size 727 and standard deviation 10.1.

Estimate how much the drug will lower a typical patient's systolic blood pressure (using a 99% confidence level).

Enter your answer as a tri-linear inequality accurate to one decimal place (because the sample statistics are reported accurate to one decimal place).

___ < μ < ____

Answer should be obtained without any preliminary rounding.

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Expert Solution
Step 1

Given information,

x¯=21.1n=727s=10.1

Confidence level=99%.

Significance level is 1%

df=n-1=727-1=726

t critical value=2.5826, from the excel function, =T.INV.2T(0.01,726)

 

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