1. A researcher is studying the effect a new drug into on blood pressure. The researcher measuresthe blood pressure of 30 participants before and after they take the drug and calculates the meandifference in blood pressure to be -5 mm Hg. The standard deviation of the differences is 8 mmHg.(a) Using p-test, determine if the change in blood pressure is statistically significant.(b) The researcher has determined that the sample standard deviation cannot be assumed as σ,perform the same test but now using a t-test.

The provided information is as follows:The total number of participants is .The mean difference in…

Answered: 1. A researcher is studying the effect…

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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A survey of 46 people was conducted to compare their self-reported height to their actual height. The difference between reported height and actual height was calculated.You're testing the claim that the mean difference is greater than 0.8.From the sample, the mean difference was 1, with a standard deviation of 0.48.
A sample is selected from a population withu = 50. After a treatment is administered to the 16 individuals in the sample, the mean is found to be M = 55 and the standard deviation is s = 8, What is the test statistic for the sample mean?
A large group of students took a test in Physics and the final grades have a mean of 70 and a standard deviation of 10. The passing score is 60. The distribution is approximately normal. Using the 68-95-99.7 (empirical) rule, find the percentage of the students(a) scored between 60 and 80.(b) scored between 50 and 90.(c) higher than 80. (d) should pass the test.
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The mean score in miss smiths 4th grade class was 76, with a standard deviation of 7. Assume the grades are normally distributed and use the empirical rule to find the approximate percentage of students who scored above 83.
The nicotine content in cigarettes of a certain brand is normally distributed with mean (in milligrams) u and standard deviation o = 0.1. The brand advertises that the mean nicotine content of their cigarettes is 1.5 mg. Now, suppose a reporter wants to test whether the mean nicotine content is actually higher than advertised. He takes measurements from a SRS of 15 cigarettes of this brand. The sample yields an average of 1.6 mg of nicotine. Conduct a test using a significance level of a = 0.05. (a) The standardized test statistic (b) The critical value (endpoint of Rejection Region) is z* = (c) The final conclusion is OA. The nicotine content is probably higher than advertised. B. There is not sufficient evidence to show that the ad is misleading.
a sample of n=16 scores is selected from a population with a mean of 60 and a standard deviation of 24. If the sample mean is M=66, what is the z-score for this sample mean?
A normal population has a mean μ = 31 and standard deviation = 8. What proportion of the population is less than 29?

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