"What's the difference?"
Hypothesis Testing
Central Limit Theorem
Binomials
Hallway conversations
100
What's the difference between a statistic and a parameter?
What is a statistic uses the sample; a parameter uses the population.
100
Is mew or the letter "M" used when you're writing out the null and alternative hypotheses?
What is MEW. always. or no points for you.
100
How many samples do we typically take in actual research?
What is only one!
100
What's the difference between p and q?
What is p = success & q = failure
100
What is a sampling distribution?
What is the distribution of a statistic obtained from repeated sampling from the population
200
What's the difference between the regular z-score formula and the special z-score formula used for sampling distributions?
What is in the denominator--with the regular z-score equation it's just sigma. In the special z-score equation you have standard error in the denominator. standard error = sigma divided by sqrt(sample size).
200
Define inferential statistics
What is when we collect data, and we use the sample data to make inferences about the population. Sample data should be random and representative.
200
What 2 things help us feel confident that the sampling distribution will be normally distributed?
What is population is normally distributed & the sample size is greater than 30.
200
Why can we cross out parts of the factorials that are on both the top and bottom of an equation?
What is because any number divided by itself is 1!
200
What's the standard error?
What is the standard deviation of the sampling distribution of the mean
300
What's the difference between a one-tailed vs. two-tailed t test?
What is one tailed = hypothesis is directional; 2-tailed = hypothesis is not directional (alternate hypothesis is not equal to the null hypothesis). We use 2-tailed t tests in research.
300
What does "rational" mean in terms of hypothesis testing?
What is systematic, logical, and has a high likelihood of being correct.
300
Is the population distribution or the sampling distribution of the means more likely to have a smaller range (aka look squished compared to the other one)?
What is the sampling distribution of the means because finding the average reduces outliers and diminishes the spread.
300
Which probabilities would you add up if I asked you to find the probability of getting less than 3 heads in 5 coin tosses?
What is p(x=0) + p(x+1)+p(x=2)
300
What does standard error measure?
What is the variability of our sampling distribution, or how spread out the means are across the sample.
400
What's the difference between empirical sampling distribution and theoretical sampling distribution
What is the population is known for empirical sampling distribution, and the population is unknown for theoretical sampling distribution.
400
The mean of the distribution of the null hypothesis is mew-sub-zero (the same as the population mean). What is the mean of the distribution of the alternative hypothesis?
What is unknown! If your sample statistic is far enough into the tail of the distribution of the null hypothesis, then we can assume it's coming from a different distribution (the distribution of the alternative hypothesis). But we don't know the parameters of the alternative distribution.
400
You have a positively skewed population distribution. You get 1000 samples of sample size 35 each. What does your sampling distribution of the means look like? Why?
What is normally distributed because of the Central Limit Theorem (samples size > 30)
400
Is a binomial distribution discrete or continuous?
What is discrete because there are only 2 options (aka bivariate random variables).
400
What's better, a smaller or bigger standard error
What is smaller because it means our estimates are more precise so we can have more confidence in our samples
500
If we find a positive result, what are 2 possible interpretations of our finding?
What is it could be due to chance or it could be a real effect.
500
Your population distribution is normal. You create a sampling distribution of the means of 60 samples with sample size 15. Is the sampling distribution of the means normally distributed? Why?
What is yes because the population distribution is normal.
500
How do you find the standard deviation of a binomial distribution?
What is sqrt(n X p X q)
500
What happens to the standard error as the sample size increases?
What is standard error decreases because the denominator gets bigger.
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