4. A medical statistician wants to estimate the average weight loss of people who are on anew diet plan. In a preliminary study, he guesses that the standard deviation of weight lossis about 10 pounds. How large a sample should he take to estimate the mean weight lossto within 2 pounds, with a 90% confidence.

Solution: Given information: σ= 10 Population standard deviation E= 2 Margin of error C= 0.9=90%…

Answered: A medical statistician wants to…

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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In your work as a biomedical engineer, you need to better understand the distribution of adults' blood pressures. Specifically, you are interested in systolic blood pressure, which is a measure of pressure within arteries when a heart beats; this is the first number in a blood pressure reading. In healthy adults, systolic blood pressure has a normal distribution with a mean of 112 mm Hg and standard deviation of 10 mmHg. Before you collect sample data, you want to predict the range in which you expect almost all of the data to fall. Which of the following represents the interval that will likely contain almost all (~99.7%) of the sample measurements of healthy adult systolic blood pressure? A) (102 mm Hg, 122 mm Hg) B) (92 mm Hg, 132 mm Hg) C) (82 mm Hg, 142 mm Hg) D) (72 mm Hg, 152 mm Hg)
State two ways the standard deviation differs from the average deviation.
A study compared the weight loss of people on a low-fat diet versus people on a low-carb diet. In a sample of 100 obese people on a low-fat diet the sample mean weight loss as 7.6 pounds with a standard deviation of 3.2 pounds. In another sample of 120 obese people on a low-carb diet the sample mean weight loss was 6.7 pounds with a standard deviation of 3.9 pounds. Write down all formulas and state the hypothesisa) Test the hypothesis, at the 5% level of significance, that there is a difference in the mean weightloss of using the 2 different diets. b) What is the p-value?
The heart rate of humans are normally distributed with a mean of 90.3 bpm and std. dev. of 7.3 bpm. What are the heartbeats that separate the lower 25% from the rest and the upper 20% from the rest?
According to the U.S. Census, the average adult woman is the United States is 65 inches tall and the standard deviation is 3 inches. If Zsike is 67 inches tall, what is her z-score?
A simple random sample of 36 observations was taken from a large population. The sample mean and the standard deviation was determined to be 80 and 12 respectively. What is the standard error of the mean?
Jack had an average score of 75 with a standard deviation of 3. Mikes z-score was 1.85. His actual score was
The empirical rule estabilishes the percentages that are 1,2, and 3 deviations from the mean True Flase
How does a nonzero constant number c change a standard deviation problem?
A medical statistician wants to estimate the average weight loss of people who are on a new diet plan. In a preliminary study, he guesses that the standard deviation of the population of weight loss is about 8 pounds. How large a sample should he take to estimate the mean weight loss to within 4 pounds, with 97% confidence? Sample Size =
Discribe the scores in a sample that has a standard deviation of zero.
The average age of Amtrak passenger train cars is about 20 years. If the distribution of ages is normal and 10% of the cars are older than 24 years, find the the standard deviation.

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