Symbols
Descriptive Statistics
Inferential Statistics
Probability
Regression
100
This symbol represents the sample mean.
What is x bar?
100
This measure of spread is calculated by taking the square root of the variance, and tells the average distance from the mean.
What is standard deviation?
100
This type of statement estimates a population parameter using an interval of plausible values, usually with 95% confidence.
What is a confidence interval?
100
The range of numbers that could be a probability.
What is 0 to 1?
100
A description for a linear correlation coefficient of r=-.9
What is strong and negative?
200
The symbols below represent the mean and standard deviation for this type of data:
What is a sample?
200
This statistic identifies the value that occurs most frequently within a dataset.
What is mode?
200
This part of hypothesis testing really gets around.
What is the null hypothesis (h0)?
200
This is the probability of an event occurring within one standard deviation above/below the mean.
What is 68%?
200
The range of numbers that could represent a linear correlation coefficient?
What is -1 to 1?
300
This symbol represents the population variance.
What is sigma squared?
300
This type of distribution models the number of successes in a fixed number of independent trials with two possible outcomes.
What is a binomial distribution?
300
The significance level of alpha=0.10 when performing a right-tailed hypothesis test has this critical value.
What is z=1.28?
300
This is the probability of selecting a male given that you are selecting someone who plays football?
What is 20/33 or 60.6%?
300
A regression equation is given as y=6.4x+15 where y represents weight of a child in pounds and x represents age in years. This is the best estimate for the weight of a 4 year old child.
What is 40.6 lbs?
400
This symbol represents the level of significance.
What is alpha?
400
The shape of the histogram shown below.
What is skewed right?
400
This test is used when you compare the mean of one sample to a known population mean, but do not know the population standard deviation.
What is a T-Test?
400
A bag contains four red marbles and one black marble. This is the probability of selecting a red, then a black, if the marbles are not replaced after being selected.
What is 20% or 1/5?
400
This is the slope, to four decimals, of the line of best fit for the dataset: (0,1), (1,4), (2,3), (4,9), (6,7).
What is 1.1034?
500
This symbol represents the standard score.
What is z?
500
These two measurements describe how spread out the data is.
What are standard deviation and IQR?
500
An online retailer claims to package less than 1% of orders incorrectly. This is the p-value, to four decimals, of a hypothesis test from a study of 400 online orders where 7 were packaged incorrectly.
What is .9341?
500
There is a 35% chance of winning a particular game by chance. This number, to four decimals, is the probability of winning the game exactly three times in five attempts.
What is .1811?
500
This statistic represents the proportion of variation in the response variable explained by the model.
What is the coefficient of determination (R2)?