Descriptive statistics & Visualization
The mean of the following set of data: 13, 23, 21, 20, 21, 24, 18
What is 20
A and B are independent events. This is the probability of A AND B happening
What is P(A)*P(B)
The abbreviations for the null and alternative hypothesis (this does not depend on the specific hypotheses)
What are H0 and H1 (or Ha)
Z-tests rely on us knowing this parameter
What is the population standard deviation
The O in N.O.I.R.
What is ordinal
The mode of this data: 10, 9, 4, 4, 8, 8, 8, 4, 7, 6, 11, 14, 27
What is 4 and 8
The shape of our sampling distribution after we take 10,000 samples from a positively skewed population
What is normally distributed
The symbol we use to represent our Type I error rate
What is alpha
The test I would use if I don't know the population SD and I want to compare risk taking levels in children vs. teenagers
What is an independent t-test
Type of variable (include discrete/continuous AND choice from N.O.I.R.) of number of petals on a flower
What is discrete ratio
The graph you typically use to look at trends over time of a continuous variable
What is a line plot
What is that 93% of other ACT takers score less than the average UNC student.
Our research question informs this hypothesis
What is the alternative hypothesis
The null hypothesis when I am comparing heart rate after running and after swimming in the same group of 50 year olds. I have no directional predictions.
What is murun - muswim = 0 (could also be muswim - murun = 0)
The value that indicates how far apart the two means are in a t-test in a standardized way
What is Cohen's d (effect size)
The name for a graph that is very pointy
What is leptokurtic
What is {HH1, HH2, HH3, HT1, HT2, HT3, TH1, TH2, TH3, TT1, TT2, TT3}
A pregnancy test says that the person is not pregnant when they are
What is a Type II error or a false negative
The difference in equations between sigma hat (estimated sigma) and sigma (population parameter)
What is a -1 in the denominator (n-1 vs. N)
The measurement scale for my variable which is numerical and includes negative values
What is interval
The interquartile range for the data set: 12, 14, 11, 10, 9, 10, 9
What is the 3 - put the numbers in order from least to greatest - find the median - find the difference between the first quartile (9) and third quartile (12)
I spin one spinner with 4 sections (labeled 1,2,3,4) and one with 3 sections (labeled 1,2,3). Event A = getting the same number on both, Event B = getting a 4. (ME, CE, Both, Neither)
The name for rejecting the null hypothesis when it is in fact false.
What is power or a correct rejection
The z-observed score when I have a sample of size 25 with an average SAT score of 450. (Mean population score is 500 and standard deviation is 100).
What is -2.5 [I found the SE = 100/sqrt(25) = 20, and then plugged it into the z equation: (450-500)/20 = -2.5]
The 95% confidence interval of a value tells me this
What is the probability of my true population value being in that range is around 95%