central tendency
The measure of central tendency associated with the most frequent value
Mode
TRUE or FALSE: We can calculate a meaningful standard deviation for a nominal variable like race.
FALSE
TRUE OR FALSE: Surveying the first 10 random people that walk into your gym constitutes a random probability sample
Stata code to create a frequency table for the variable educ
tab educ
The level of measurement for the rating of what you had for breakfast, on a scale from “delicious” to “terrible”
Ordinal
The median of the following set of numbers: 3, 5, 3, 9, 7, 1
4
Trust in government was rated on a scale of 1-10 by those under 18 and over 65. Based on the following Stata output, which age group had more consistent ratings of trust?
Under 18s
You survey 100 people on the New York subway to ask how strongly they agree that New York is the best city on Earth. Specify the population from which the sample was drawn.
New York subway riders
Stata code to create a new variable called inc with all values set to 0
gen inc=0
The dependent variable in the research question: how does drinking coffee affect students’ statistics exam scores?
Exam scores
Which is the most affected by outliers: the mean, median, or mode?
Mean
A population has a mean home purchase price of $300,000 with a standard deviation of $150,000. We can expect about 68% of home purchases are within what dollar range?
$150,000 - $450,000
A population has a mean IQ of 105 and a standard deviation of 15. What is the z score when IQ is 125?
1.33
Stata code to find the mean of the variable wealth for people who are retired. The variable retired is coded as 1=retired and 0=not retired
A bell-shaped and symmetrical theoretical distribution
Normal curve / normal distribution
In a right skewed distribution, is the median above or below the mean?
BELOW
Which measure of variability is less influenced by outliers: the range or the IQR?
IQR
Based on sample data, the 95% confidence interval for the percentage of the U.S. population that believes in life after death is 76 to 94%. What is the chance the true population percentage falls outside of this interval?
5%
Stata code to estimate a crosstab of the variables religion and partyid with row percentages
tab religion partyid, row
The unit of analysis in the hypothesis: Campus clubs with an academic focus have higher average member GPAs than campus clubs with a social focus.
Campus clubs
Calculate the median category for this frequency table
Agree
Calculate the IQR categories for this frequency table
Strongly agree to agree
Holding other factors constant, if the sample size goes up, does the confidence interval width increase or decrease?
Decrease
Stata code to create a new variable with the standardized Z scores for the variable tuition
egen ztuition = std(tuition)
Based on the following Stata output, is the distribution of the variable internet hours right-skewed, left-skewed, or symmetrical?
Right-skewed