The lengths of pregnancies in a small rural village are normally distributed with a mean of 262 days and astandard deviation of 13 days. A distribution of values is normal with a mean of 262 and a standard deviationof 13.What percentage of pregnancies last fewer than 223 days?P(X< 223 days) =Enter your answer as a percent accurate to 1 decimal place (do not enter the "%" sign). Answers obtained usingexact z-scores or z-scores rounded to 3 decimal places are accepted.

Answered: Image /qna-images/answer/200e0511-dd3f-4d64-95c8-0938d8a711fe.jpg

Answered: The lengths of pregnancies in a small…

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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Find the z-score when x is 5, mean equals 7, and standard deviation 3.
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The SAT scores of students are normally distributed with a mean of 950 and a standard deviation of 200. Q19 What percentage of students score between 1100 and 1200? Your answer should be in % and have two digits after the period. So, if your answer is 50.723%, write 50.72. Your Answer:
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Quit Smoking: The New England Journal of Medicine published the results of a double-blind, placebo-controlled experiment to study the effect of nicotine patches and the antidepressant bupropion on quitting smoking. The target for quitting smoking was the 8th day of the experiment. In this experiment researchers randomly assigned smokers to treatments. The following is an excerpt from this same study. “ A total of 311 subjects (34.8 percent) discontinued one or both medications. Seventy-nine subjects stopped treatment because of adverse events: 6 in the placebo group (3.8 percent), 16 in the nicotine-patch group (6.6 percent), 29 in the bupropion group (11.9 percent), and 28 in the combined treatment group (11.4 percent). The most common adverse events were insomnia and headache.” Recall that 160 smokers took the placebo and 244 smokers used nicotine patches. Could the researcher use this data with an inference procedure from this module to test a claim about (or to estimate the…
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