chapter 2.2 Flashcards
When can you use table A backwards
when given the area and you have to find the z score
what is the 68, 95, 99.7 rule and when does this rule apply
68% of the data will fall within one standard deviation, 95% will Fall within two standard deviations, and 99.7% will Fall within 3 standard deviations of the mean
what is the standard normal distribution
the normal distribution has a mean of 0 and SD of 1
what info does the standard normal table give
gives areas under the standard normal curve
what is the abbreviation for normal distribution with a mean and a standard deviation
N(M,SD) AKA mu and Omega symbols
what does the area under a density curve represent
the proportion of all observations that fall in that interval
where is the mean of a density curve located
the point at which the curve would balance if made of solid material
what is a density curve
a curve that is always on or above the horizontal axis and has an area exactly 1 underneath it
define normal distribution and normal curve
a normal distribution is described by a normal density curve any particular normal distribution is completely specified by two numbers (mean and standard deviation)
how do you interpret a normal probability plot
the points should lie close to a straight line, any points far off the line may be outliers
what is a normal probability plot
a graphical technique that shows a linear distribution
describe two methods for assessing whether or not a distribution is approximately normal
if the shape of the distribution is approximately symmetric, if the distributions mean and median are equal
when is it appropriate to use the normalcdf and inverse normal functions on the calculator
when finding the percentile of a given value in a normal distribution
what does the total area under a normal distribution curve equal
1
describe the shape of a normal curve
approximately symmetric, single peaked, and bell-shaped
