Organizing Data
This measure of center is more resistant to outliers than the mean.
What is the median?
This phrase is used to describe an observed effect so large that it would rarely occur by chance.
What is statistically significant?
This type of random variable requires a fixed number of trials.
What is a binomial random variable?
The type of significance test used for the mean of a single population when the standard deviation of the population is unknown.
What is a T test (or T procedure)?
To calculate, subtract the mean of the distribution from the observed x, then divide by the standard deviation.
What is the z-score (or standardized value)?
randInt(1,9,3)
What is the calculator command for generating 3 random numbers from 1 to 9?
The type of variable where the probability distribution assigns probability as the area under the density curve above a specific interval.
What is a continuous random variable?
The formula to calculate the one-sample t test statistic.
What is z = (x bar minus mu sub o) divided by (sigma divided by the square root of n) ?
This rule helps to determine if data is normally distributed by checking the number of observations within each interval.
What is the 68-95-99.7 rule?
This experimental design involves the random assignment of units to treatments which are carried out separately within each group of units known to be similar in some way that is expected to affect the responses.
What is block design?
Events that have no outcomes in common and can never occur simultaneously, for which the addition rule is used.
What are disjoint events (or mutually exclusive events)?
The conditions to use this test include all cells be counted data and all the expected counts be greater than 5.
What is the goodness of fit (or chi-square) test?
The square of the standard deviation.
What is the variance?
Applying a linear regression model to a value beyond our data set; can lead to trouble like trying to see into the future
What is extrapolation?
The 3 basic principles of experimental design. The fourth is only if necessary
What are control, randomize, and replicate (blocking)?
The condition involving the population size that must be satisfied to use sigma divided by the square root of n as the standard deviation of a sampling distribution.
What is 'the population is at least 10 times the sample size' (or 10% condition)?
Two of the conditions to be verified for inference about a proportion.
What are the sampling less than 10% of the population and n times p hat & n times (1 - p hat) be greater than or equal to 10? (SRS could also be one of the two)
This calculator command can be used to find the area under a normal distribution and above an interval.
What is normalcdf?
a variable that is not explicitly part of a model but effects the measured variables causing an apparent association (sharks and ice cream sales)
What are lurking variables?
Give 5 steps of the 7 steps to run a simulation
What are 1)identify component 2)model the outcome 3)combine components to model a trial 4)identify the response variable 5) run trials 6) Summarize trials 7)state conclusion?
The formula to determine the variance for a discrete random variable with three possible values.
What is sigma sub x squared = (the square of the difference between x sub 1 and mu multiplied by p sub 1) + (the square of the difference between x sub 2 and mu multiplied by p sub 2) + (the square of the difference between x sub 3 and mu multiplied by p sub 3) ?
equation of a 2 sample mean confidence interval
What is xbar1-xbar2 +/- t* SD of statistic?