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In: Mechanical Engineering
Question 1c (0.5 pts): In a study published in 2016, a team of researchers found that...
Question 1c (0.5 pts): In a study published in 2016, a team of researchers found that tensile strain caused the valence band of an organic semiconductor to narrow and fall to lower energy levels without affecting the conduction band. What do you think this means for the electrical conductivity of the material when placed under tensile strain? Why do you think this occurs?
Solutions
samet mamat answered 2 years agoRelated Solutions
2. In 2004, a team of researchers published a study of contaminants in farmed salmon. Fish...
2. In 2004, a team of researchers published a study of
contaminants in farmed salmon. Fish from many sources were analyzed
for 14 organic contaminants. The study expressed concerns about the
level of contaminants found. One of those was the insecticide
mirex, which has been shown to be carcinogenic and is suspected to
be toxic to the liver, kidneys, and endocrine system. Summaries for
the mirex concentrations (in parts per million) in the farmed
salmon are: n=150, X ̅=0.0913 ppm,...
A team of researchers found that age distributions in a population of 100,000 people was not...
A
team of researchers found that age distributions in a population of
100,000 people was not Normal. However, after they took a large
number of simple random samples, each with (N=100), they observed
that the sampling distribution of mean tended toward
Normality
In a study published in the American Journal of Psychiatry researchers wanted to measure the effect...
In a study published in the American Journal of Psychiatry
researchers wanted to measure the effect of alcohol on the
development of the hippocampal region (responsible for long term
memory storage) in adolescents. The researchers randomly selected
12 adolescents with alcohol use disorders. They wanted to determine
whether the hippocampal volumes in the alcoholic adolescents were
less than the normal volume of 9.02 cubic centimeters HA:μ<9.02
. An analysis of the sample data revealed that the hippocampal
volume is approximately...
In a study published in the American Journal of Psychiatry researchers wanted to measure the effect...
In a study published in the American Journal of Psychiatry
researchers wanted to measure the effect of alcohol on the
development of the hippocampal region (responsible for long term
memory storage) in adolescents. The researchers randomly selected
12 adolescents with alcohol use disorders. They wanted to determine
whether the hippocampal volumes in the alcoholic adolescents were
less than the normal volume of 9.02 cubic centimeters HA:μ<9.02
. An analysis of the sample data revealed that the hippocampal
volume is approximately...
A newspaper published an article about a study in which researchers subjected laboratory gloves to stress....
A newspaper published an article about a study in which
researchers subjected laboratory gloves to stress. Among 225 vinyl?
gloves, 60?% leaked viruses. Among 225 latex? gloves, 9?% leaked
viruses. Using the accompanying display of the technology? results,
and using a 0.05 significance? level, test the claim that vinyl
gloves have a greater virus leak rate than latex gloves. Let vinyl
gloves be population 1.
Technology Results:::
Pooled? proportion: 0.35
Test? statistic, z: 11.2921
Critical? z: 1.6449
?P-value: 0.0000
90?%...
A newspaper published an article about a study in which researchers subjected laboratory gloves to stress....
A newspaper published an article about a study in which
researchers subjected laboratory gloves to stress. Among 242 vinyl
gloves, 66% leaked viruses. Among 242 latex gloves, 10% leaked
viruses. Using the accompanying display of the technology results,
and using a 0.05 significance level, test the claim that vinyl
gloves have a greater virus leak rate than latex gloves. Let vinyl
gloves be population 1.
A newspaper published an article about a study in which researchers subjected laboratory gloves to stress....
A newspaper published an article about a study in which
researchers subjected laboratory gloves to stress. Among 254 vinyl
gloves, 69% leaked viruses. Among 254 latex gloves, 12% leaked
viruses. Using the accompanying display of the technology results,
and using a 0.05 significance level, test the claim that vinyl
gloves have a greater virus leak rate than latex gloves. Let vinyl
gloves be population 1. What is the test statistic and p value?
Researchers found a crude odds ratio of 1.8 in a case-control study.
Researchers found a crude odds ratio of 1.8 in a case-control study. They stratified their analysis within levels of a binary potential confounder and found an odds ratio of 1.2 in one level of the confounder and an odds ratio of 2.8 in the other level of the confounder.
A. Do you think they should present the adjusted odds ratio in the report of their results?
B. Why or why not?
Application Exercise: A team of researchers recruited a random sample of migraine sufferers. Before the study...
Application
Exercise:
A team of researchers recruited a random sample of migraine
sufferers. Before the study began at baseline, participants were
asked to record the duration of headaches they experienced in a
week. A few days later, all participants were asked to practice a
week-long relaxation technique designed to reduce migraine
headaches. A two-week off period in which the participants
practiced nothing was given between the relaxation technique.
Throughout the relaxation technique participants were asked to
record the duration of...
2. A team of market researchers conducted a study involving 200 inhabitants of the United States...
2. A team of market researchers conducted a
study involving 200 inhabitants of the United States to determine
what people fear most. The gender of each person polled was noted,
and then each was asked which of the following was his or her
greatest fear: speaking before a group, heights, bugs/insects,
financial problems, sickness/death, and other. The results of the
poll are given in the table. Do the data provide sufficient
evidence to indicate a relationship between gender and greatest...
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