The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, onaverage, the reduction in systolic blood pressure is 24.9 mmHg (millimeters of mercury) for a sampleof size 18 and a sample standard deviation 9.6 mmHg. How much of mmHg will lower for a typicalpatient's systolic blood pressure after taking the drug? Estimate with a 90% confidence.Preliminary:Is n > 30?O YesO NoOFConfidence Interval:What is the 90% confidence interval to estimate the population mean? Roundyour answer to one decimal place.PA

Answered: Image /qna-images/answer/8fcc223f-7acd-458a-935b-7a9004eef3f8.jpg

Answered: The effectiveness of a blood-pressure…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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The shape of a given population distribution is normal with a mean of μ = 85 and a standard deviation of o= 6.5. For these parameters, transform a raw score of X = 100.5 into its corresponding z score. Round to the nearest tenths place if a fraction. The z score is: O 2.4 -3.7 -3.4 09.2 The correct z-score is not listed.
A simple random sample of 40 items resulted in a sample mean of 20. The population standard deviation is o = 3. Round your answers to two decimal places. a. What is the standard error of the mean, oz? b. At 95% confidence, what is the margin of error?
A simple random sample of 40 items resulted in a sample mean of 25. The population standard deviation is o = 5. Round your answers to two decimal places. a. What is the standard error of the mean, o7 ? b. At 95% confidence, what is the margin of error?
Given that X is a normal variable whose distribution has a mean of 10 and a standard deviation of 2.5, find the value of P(X > 15). Notes: 1. Write your answer using four decimal places (i.e. 0.2612) 2. Do not express your answer as percentage.
You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately σ=28.1σ=28.1. You would like to be 98% confident that your esimate is within 3 of the true population mean. How large of a sample size is required?n =
Assume that a sample is used to estimate a population mean μ. Find the margin of error M.E. that corresponds to a sample of size 22 with a mean of 62.5 and a standard deviation of 9.6 at a confidence level of 80%.Report ME accurate to one decimal place because the sample statistics are presented with this accuracy. M.E. =
Suppose that the standard deviation for monthly rent is$400. How many apartments should be sampled in order to estimate μ to within $100 of its true value with 99% confidence?
Our environment is very sensitive to the amount of ozone in the upper atmosphere. The level of ozone normally found is 7.5 parts/million (ppm). A researcher believes that the current ozone level is at an excess level. The mean of 66 samples is 7.7 ppm with a standard deviation of 1.0 Does the data support the claim at the 0.025 level? Assume the population distribution is approximately normal. Step 2 of 5 : Find the value of the test statistic. Round your answer to three decimal places. Specify if the test is one-tailed or two-tailed. Determine the decision rule for rejecting the null hypothesis. Round your answer to three decimal places. Make the decision to reject or fail to reject the null hypothesis.
What is the standardized test statistic t for a sample with n = 12, xbar = 30.2, s = 2.2, and α = 0.01 if H0: µ =29? Round your answer to the nearest thousandth.
An engineer wishes to determine the width of a particular electronic component. If she knows that the standard deviation is 3.4 mm, how many of these components should she consider to be 99% sure of knowing the mean will be within ±0.5±0.5 mm?

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