Exam 1 Flashcards
The best type of graph to depict time series data would be a:
Line Graph
The hypothesis that “spider mites have no effect on wilt disease in cotton plants (Gossypium)” is
an example of a:
Null Hypothesis
The statistic that indicates average dispersion of your data in units that are the same
form as your mean is known as the:
Standard Deviation
What is a Type I error?
Type I error indicates support for the alternative hypothesis when the null is actually true (Falsely reject null, overreacting)
What is a Type II error?
Type II error indicates support for the null hypothesis when the alternative is true (Falsely accept null)
What is the central limit theorem and what does it predict about our ability to estimate u?
We never know u, but if we collect many samples we can get closer to estimating u
A variable that consisted of ranked data (e.g. from smallest to largest) would be
considered a:
Ordinal Variable
Imagine that you were comparing the jumping ability of young frogs, mid-life frogs, and old frogs. What kind of variable would this measure of age be?
Ordinal
Imagine that you were working on wheat genetics and you produced a strain of genetically modified wheat that had much greater output than traditional artificially selected wheat. If you wanted to know which strain had more variable output, what would be the best statistic to use?
Coefficient of Variation
If we were measuring the length of native snails from Blue Spring in mm, which of the following would be the best way to represent the mean? Representative data would include 8, 5, 3, 12, 2, etc.
4.4 mm
Imagine that you’re working at a turtle hospital with 22 green sea turtles, 2 leatherbacks, and 10 hawksbill turtles in rehab. If you select a turtle at random to treat,
what’s the likelihood that it would be a leatherback?
0.059
Suppose that a disease is inherited via a sex-linked mode of inheritance, but rare. The sex ratio of the population isn’t quite 1:1, so 51.3% of the population are male. A male offspring has a 15% chance of inheriting the disease, but a female offspring has no
chance of inheriting the disease. What is the probability that a randomly chosen child will be affected by the disease?
0.077
Imagine that you were going to test whether myocardial blood flow increased when
four subjects were given air that had artificially low oxygen (as at high altitude) as compared to four subjects who were given air with an ambient oxygen concentration. Which of the following is true about the t test that you would run?
It would be one tailed
Apophenia
An error of perception
Categorical Variable
Nominal or Ordinal
