Exploring Two-Variable Data
What does b represent in y = a +bx?
What is slope
Define a treatment
What is: what you do to the experimental unit
What type of procedure do we use for confidence intervals for difference in population proportions?
What is two sample z-interval for population proportions
The four categories of necessary data that you need to conduct a Chi-Squared test
What are observed counts, expected counts, sample size, and number of categories?
A variable that takes values that are category names or labels?
What is a categorical variable
What do you call sampling where one takes a sample from a group of people that are easy to reach?
What is convinience sampling?
What is the difference between conditions for confidence intervals for population proportions vs confidence intervals for difference in population proportions?
What is checking both proportions for difference in population proportions
The name of the calculator function to conduct a Chi-squared test
What is "X^2 CDF"?
Y (actual) - Y (predicted)
What is a residual
What is the outcome variable?
What is the response variable
What tells us how much a value of a sample statistic is likely to vary from the value of the corresponding population parameter?
What is margin of error
The equation for Chi-squared testing
Between -1 and 1, tells how closely related two variables are
What is correlation coefficient (r)
What are we allowed to infer based on random assignment?
What is causation
Ho - the weather will remain dry
Ha - it will rain
What are the consequences for type I and type II error?
Type I error: carrying an umbrella all day expecting it to rain and it doesn't
Type II: not bringing an umbrella and you get drenched
The three conditions necessary to conduct a Chi-Squared test
What are: randomness, 10% and large counts (all expected counts are >5?
An example of an unusual feature on a dot plot
What is a cluster or an outlier
Name the four principles of experimental design
What are comparison, random assignment, control, replication
What is the probability of a type II error?
What is 1 - power
The way to find expected counts for a chi-squared test when they are not given to you
What is: row total x column total/total total?