Determining which test to use
Symbols
Distributions
Types of Graphs
Sampling Types
100
Deanna is running the polls at a voting site. There were 1,000 people who voted at her site, and Deanna wants to know what proportion of voters at the site voted for the Republican candidate. She takes a SRS of 100 voters and finds that 13 people voted for the Republican Candidate.
What test should Deanna use in this scenario?
1-Proportion Confidence Interval
100
Sample proportion
p̂
100
Q3-Q1 is equal to what measure of spread?
IQR
100
What kind of graph is this?
Histogram
100
What is the hat method an example of?
SRS
200
How much longer will swimmers stay in a heated pool compared with an unheated pool? When the pool was heated 67 swimmers were observed and when the pool was unheated 55 other swimmers were observed.
Confidence Interval for the Diff. Between 2 Means
200
Sample mean
xÌ…
200
Are all bell curves normal?
No, the shape is the only clue
200
What kind of graph is this?
A stem plot
200
According to the example below, what is the sampling type:
Choose the first 50 people that enter the theatre?
Convenience Sample
300
Are people happier after they get married? 100 people were asked on a scale from 1 to 10 how happy they were one year before marriage and one year after marriage
Hypothesis Test for Paired Data
300
What does the ∩ symbol mean in probability?
Intersection
300
What center statistic is resistant to outliers?
Median
300
What graph should be used to demonstrate change over time?
Linear graph
300
According to the definition below, what is the sampling type? Arranging the population into similar (homogenous) groups and taking an SRS of each group.
Combining the sub-samples from each stratum creates the final stratified random sample.
400
Do community college statistics students spend a higher percentage of their study time in math compared with university students? 70 community college students and 70 university students were questioned.
Hypothesis Test for Difference of Means
400
Coefficient of Determination
r2
400
What is used to test variability in statistics by calculating the average distance from the mean of all the values in a data set?
Standard deviation
400
What is one kind of graph that should be used with categorical data?
Frequency graph, pie chart, bar graph
400
What is matched pair?
A common type of blocking with 2 subjects per block.
500
Does the political affiliation of congress reflect the known political affiliation of the American Public?
Chi-Squared Goodness of Fit Test
500
Probability of a Type 1 Error
Significance (alpha) level a
500
What's the difference between a t and normal distribution?
The normal distribution assumes that the population standard deviation is known. The t-distribution does not make this assumption. Instead, it is defined by the degrees of freedom.
500
What graph should we use when we want to understand the distribution of body masses of 60 male undergraduates?
A histogram
500
What are the 4 principles of an Experimental Design?
Comparison, Random Assignment, Control, Replication