The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 18.4 for a sample of size 276 and standard deviation 21.7. Estimate how much the drug will lower a typical patient's systolic blood pressure (using a 95% 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 18.4 for a sample of size 276 and standard deviation 21.7.

Estimate how much the drug will lower a typical patient's systolic blood pressure (using a 95% 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).

Expert Solution
Step 1

Obtain the critical value:

The level of confidence is 1- α = 0.95.

The sample size is n = 276.

The critical value is obtained as 1.9686 from the calculation given below:

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