How do you find the test statistic for a chi-square test? The test statistic involves finding the squared difference between actual and expected data values, and dividing that difference by the expected data values. You do this for each data point and add up the values. Then, you compare the test statistic to a theoretical value from the Chi-square distribution. What is your chi-square test statistic? The chi-squared statistic is a single number that tells you how much difference exists between your observed counts and the counts you would expect if there were no relationship at all in the population....

When was the first Ebola outbreak in Zaire? In 1976, Ebola (named after the Ebola River in Zaire) first emerged in Sudan and Zaire. The first outbreak of Ebola (Ebola-Sudan) infected over 284 people, with a mortality rate of 53%. A few months later, the second Ebola virus emerged from Yambuku, Zaire, Ebola-Zaire (EBOZ). What was Ebola's death rate? The virus is transmitted to people from wild animals and spreads in the human population through human-to-human transmission. The average EVD case fatality rate is around 50%. Case fatality rates have varied from 25% to 90% in past outbreaks. Who was...

What does amyloid beta peptide do to the brain? Accumulation of Aβ along brain blood vessels (cerebral amyloid angiopathy) and associated vascular inflammation leads to BBB hyperpermeability and altered communication between the brain and the peripheral immune system that favor the entrance of activated peripheral immune cells into the brain. What is amyloid beta oligomers? Professor Dennis Selkoe explains that amyloid beta oligomers - small assemblies of amyloid beta protein associated with Alzheimer's disease - do not cause plaques but prevent them. Amyloid beta oligomers are small assemblies or aggregates of this so-called amyloid beta protein, which I’ll call a-beta....