14 Dec Complete this review guide for extra credit
Frequency Distributions
For the variable earnrs what is the valid N? ____________
What is the most common answer for the variable earnrs? ______________
What percent of the sample indicate they have 4 family members who earn money? ______________
What percent of the sample have 2 or fewer family members earning money? ______________
What percent of the sample have 4 or more family members earning money? ______________
Central Tendency
For the variable hompop find the following
Valid N. _________ Mean _________ Median _________ Mode _________
Min. _________ Max. _________ Standard Deviation _________
Judging from the values of the mean and median, which way will the distribution of the variable hompop be skewed? __________________
Levels of Measurement
Identify if the following variables are Ordinal, Nominal, or Interval Ratio
wrkstat ________________________
earnrs ________________________
wealth _________________________
happy ________________________
tvhours ________________________
sibs ___________________________
T-Tests
Run a One-Sample T-Test for the variable tvhours. Let’s say you hypothesize that on average, Americans will watch less than 5 hours of TV per day. Fill out the following information’
N _________ T-statistic _________ degrees of freedom _________
level of significance _________ Mean _________ Standard Deviation ____________
Thinking about your hypothesis, what can you conclude about the number of hours people spend watching TV?
Cross-Tabs and Chi Squares
Run a cross-tab and chi-square with the two variables conjudge and natroad (natroad will be the dependent variable). Ask for the chi square statistic, the gamma, and Kramer’s V.
Depict your hypothesis as a causal diagram (use boxes and arrows) and explain your reasoning below
Is there a relationship between these two variables?
What is the strength and maximum difference?
What is the direction of the relationship?
Report the Chi-Square statistic _________ Report the Degrees of freedom _________ What is the significance reported in the output? _________
Report the Gamma_________ Report Cramer’s V_________
Graphs
Create a Pie chart for the variable wealth
What is the mode for the variable wealth? ___________
What percent of people fall into the category of $100,000 to $150,000? _______________
Create a clustered bar chart for the variable happy and define the clusters by sex
For the category “pretty happy,” did males or females report a greater number? _________________
What percent of females reported being “not too happy”? _________
Regression
Create a regression model for the two variables age and weekswrk (weekswrk is the DV)
Report the R-Square value? __________
About what percent of the variation in weeks worked does age explain? _____________
Report the coefficient for age? ____________
What is the intercept term ( a)? ______________
Now create a multiple regression model by adding the variable tvhours to the regression model. You will have two IVs: tvhours and age, and your dependent variable is weeksrk.
Did the model improve? _______________
Determine how many weeks a year that a person works at the age of 22, if they watch 4 hours of TV per day.
