BIO 550 Exam 3 Questions
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The __ __ is a continuous probability distribution describing a bell-shaped curve. It is a good approximation to the frequency distributions of many biological variables.
A __-__ is the probability of obtaining data (or data showing as great or greater difference from the null hypothesis) if the null hypothesis were true.
For a variable with normal distribution, about __ of values within one standard deviation of the mean and about __ are within two standard deviations of the mean.
two-thirds, 95%
The __ __ __ is a normal distribution with a mean of zero and a standard deviation of one
standard normal distribution
A __ __ __ tells us how many standard deviations a particular value is from the mean.
standard normal deviate
True or False: If a variable has a normal distribution in a population, then the distribution of sample means is also normal.
According to the __ __ __, the sum or mean of a large number of measurements randomly sampled from a non-normal population is approximately normally distributed.
central limit theorem
True or False: If a variable has a normal distribution, its mean and median are the same, but the mode is equivalent to the standard deviation.
To describe a normal distribution, we need to know the __ and the __.
mean, standard deviation
The difference between the sample mean and the true mean divided by the estimated standard error has a Student's __ with n-1 degrees of freedom
t-distribution
Using the equation sheet from exam 3, which equation is used to calculate the 95% confidence intervals of the mean in a Student's t-distribution?
average mean plus or minus t at a particular critical value given degrees of freedom
In a one-sample t-test, the null hypothesis is that the true mean is equal to __.
the true mean
The __ __ t-test compares the mean of a random sample from a normal population with the population mean proposed in a null hypothesis.
one-sample
The two assumptions of the one-sample t-test are:
1) The data are a __ sample from the population.
2) The variable is __ distributed in the population.
randomly, normally
In a __ design, both treatments are applied to every sampled unit.
paired
In a __ design, each treatment group is composed of an independent, random sample of units
two-sample
True or False: Paired measurements are converted to a single measurement by dividing them.
The two assumptions of paired t-tests are:
1) The sampling units are __ sampled from the population
2) The paired differences have a __ distribution in the population
True or False: Paired t-tests make no assumptions about the distribution of individual units in a sampling unit
The __ is the average of the variances of the samples weighted by their degrees of freedom
pooled sample variance
In a two-sample t-test, the null hypothesis is that the mean of the population is equal to __
the mean of the other population
The assumptions of a two-sided t-test are:
1) Each of the two samples is a __ sample from its population
2) The numerical variable is __ distributed in each population
3) The __ of the numerical variable is the same in both populations
random, normally, standard deviation
__ t-test compares the means of two groups and can be used even when the standard deviations of the two groups are not equal
The __ states that comparisons between two groups should always be made directly, not indirectly by comparing both to the same null hypothesized value.
fallacy of indirect comparison
BIO 320 Online Quizzes
BIO 320 Lecture 15
State whether the given fraction is equivalent to -5/6. -20/24
Simplify: $\frac{\left(x^{2}\right)^{-2}\left(y^{0}\right)^{2} y y^{3}}{\left(y^{-2}\right)^{3} y y^{4} y^{-1} x}$
Simplify: $$ \dfrac{1}{6} - \dfrac{1}{3} $$
Find the domain of the function. Do not use a graphing calculator. $f(x)=\sqrt{3-x}+\sqrt{x+5}$
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