Question

Question 3.

A. The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 25.1 for a sample of size 810 and standard deviation 12.5.
Estimate how much the drug will lower a typical patient's systolic blood pressure (using a 98% 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).
x < μμ < x

B. You must estimate the mean temperature (in degrees Fahrenheit) with the following sample temperatures:

42.1
26.1
25.1
31.8
32.7
27.7
26.4
32.6

Find the 80% confidence interval. Enter your answer as an open-interval (i.e., parentheses) accurate to two decimal places (because the sample data are reported accurate to one decimal place).
80% C.I. =

C. In a survey, 26 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $40 and standard deviation of $8. Construct a confidence interval at a 90% confidence level.
Give your answers to one decimal place.

x ±± x
Interpret your confidence interval in the context of this problem.= write your text here.

Answer 1

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