Social Research Ch. 14 Review Quiz (Univariate and Bivariate Analysis of Quantitative Data)
What does it mean to say that the 95th percentile of household income is $196,000?
95% of households have incomes below $196,000
Which of the following statements about confidence intervals is true?
As sample size increases, the confidence interval narrows.
In a bivariate regression analysis examining the effect of years of education on average income the resulting equation produced for the best-fitting line is: Average income = -62,181 + (8,283 x Years of education) What statement best describes these results?
Each additional year of education increases a worker's average yearly income by a little more than $8,283.
Which of the following statements about ordinal and nominal variables is true?
The difference between these two types of variables is that categories within nominal variables cannot be ranked while categories within ordinal variables can.
Researchers have found that, on average, individuals' political views move slightly more conservative as they grow older. What type of effect is this?
age effect
Which of the following statements does your textbook suggest is a key piece of advice for evaluating statistics?
always consider the source
cell percentage
bottom tabulation
A survey includes the following question and answer choices: "In the past 3 months, how many total sexual encounters have you had? None 1 to 2 encounters 3 to 5 encounters 6 to 10 encounters More than 10 encounters" What type of variable is "total sexual encounters"?
categorical
What type of mean is depicted in this table? (mean income by race/ethnicity, 2000-2014)
conditional; the conditional mean is a statistic that is calculated only for observations that meet a particular condition rather than calculated for every observation- in this case, for each racial/ethnic category.
What do the skinny gray bars indicate? (error bars)
confidence intervals
What do the shaded cells represent? (totals)
marginal frequencies
Data availability often severely limits our ability to detect and examine period and age effects. Even if good data are available and recorded regularly, our ability to detect and examine period and age effects can be limited by changes in __________________________.
measurement
row percentage
middle tabulation
Researchers have found that, on average, individuals who were alive during the September 11, 2001 attacks shifted their views to be more accepting of restraints on personal liberty in exchange for safety. What type of effect is this?
period effect
In a bivariate regression analysis, the equation for the function is written as: y = a + bx What does the b represent?
the slope of the line
Trends are essentially bivariate patterns in which one of the variables is ___________________.
time
column percentage
top tabulation
