The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 61.7 mmHg (millimeters of mercury) for a sample of size 1096 and a sample standard deviation 5.7 mmHg. How much of mmHg will lower for a typical patient's systolic blood pressure after taking the drug? Estimate with a 80% confidence. What is the 80% confidence interval to estimate the population mean? Round your answer to one decimal place.

Q: A quantitative data set has mean 30 and standard deviation 4. At least what percentage of the…

A:

Q: A particular fruit's weights are normally distributed, with a mean of 770 grams and a standard…

A: Let X be the random variable measuring the fruit's weight. Hence, X~ N(770,222)…

Q: he scores on a recent midterm for Statistics is normally distributed.  The mean for a midterm exam…

A: Given that  The scores on a recent midterm for Statistics is normally distributed. Mean (μ) = 72…

Q: Pyramid Lake is on the Paiute Indian Reservation in Nevada. The lake is famous for cutthroat trout.…

A: Given Information: Population mean (μ) = 19 inches;  Sample mean (x¯)= 18.6 inches; Sample standard…

Q: A normal population has a mean μ = 40 and standard deviation σ = 8. What proportion of the…

A: NORMAL DISTRIBUTION ,μ=40σ=8 proportion of the population is between 37 and 48=?

Q: the mean weight of a group of boys is 145 lb, with a standard deviation of 5lb. if the weights are…

A: We have to find correct answer..

Q: normally distributed, with a mean of 323 grams and a standard deviation of 7 grams. The heaviest…

A: Given: μ=323σ=7 We know that,  P(Z>z)=1-P(Z≤z) P(Z>z)=1-0.18           =0.82 From the standard…

Q: A particular fruit's weights are normally distributed, with a mean of 308 grams and a standard…

A: Given data,μ=308σ=19P(X>x)=0.15x=?