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2021-08-11
Answered

State whether the inl'esrigarion in question is an observational study or a designed experiment. Justify your answer in each case. According to a study published in the Journal of the American Public Health Association, left-handed people do not die at an earlier age than right-handed people, contrary to the conclusion of a highly publicized report done 2 years earlier. The investigation involved a 6-year study of 3800 people in East Boston older than age 65. Researchers at Harvard University and the National Institute of Aging found that the "lefties" and "righties" died at exactly the same rate. "There was no difference, period," said Dr. J. Guralnik, an epidemiologist at the institute and one of the coauthors of the report.

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Fatema Sutton

Answered 2021-08-12
Author has **88** answers

It is a observational study. They researcher only collected data that he had no influence on. It was merely an observation.

asked 2021-03-18

A population of values has a normal distribution with

Find the probability that a single randomly selected value is between 133.6 and 134.1.

Write your answers as numbers accurate to 4 decimal places.

asked 2021-02-21

We wish to estimate what percent of adult residents in a certain county are parents. Out of 600 adult residents sampled, 192 had kids. Based on this, plot a

Express your answer in the form of three inequalities. Give your answers in decimal fractions up to three places

asked 2022-02-11

I need to figure out how or where to find the standard deviation and mean for this problem
Given that z is a standard normal random variable, compute the following probabilities.

a. P(z≤−1.0)

b. P(z≥−1)

c. P(z≥−1.5)

d. P(−2.5≤z)

e. P(−3

a. P(z≤−1.0)

b. P(z≥−1)

c. P(z≥−1.5)

d. P(−2.5≤z)

e. P(−3

asked 2022-01-17

What is a random walk?

asked 2022-01-29

A test consists of 910 true or false questions. If the student guesses on each question, what is the standard deviation of the number of correct answers?

asked 2021-01-22

A population of values has a normal distribution with mean = 37.4 and standard deviation 77.4. If a random sample of size $n=15$ is selected,

Find the probability that a single randomly selected value is greater than 53.4. Round your answer to four decimals.

$P\left(X>53.4\right)=$ ?

Find the probability that a single randomly selected value is greater than 53.4. Round your answer to four decimals.

asked 2022-03-21