cj j stats nibrs-gss practice
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SPSS6Lecture2.pptx
GSS and NIBRS 6 Lecture
Dr. M. Spencer
Confidence Intervals
When we sample, if done correctly, the mean should give us a good idea of the mean of the entire population
We can run confidence intervals to determine the range of the true mean of the population
A 95% CI tells us we are 95% certain the average of the population (as opposed to the sample) falls between these two numbers
A 99% CI tells us we are 99% certain the average of the population (as opposed to the sample) falls between these two numbers
GSS 1
Using the General Social Survey, calculate 95% and 99% confidence intervals for the population mean for the number of hours per week that they spend on e-mails. (EMAILHR). Hint: ANALYZE, COMPARE MEANS, ONE-SAMPLE T-TEST, and set options to desired percentages.
GSS 2
Using the General Social Survey, calculate a 95% confidence interval for the population mean for individual income (RINCOM06) of Americans in 2006 dollars.
GSS 3
Using the General Social Survey, calculate a 95% confidence interval for the percentage of Americans in favor of allowing a police officer to hit a citizen if that citizen was hitting the police officer with his or her fists (POLATTAK).
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GSS 4
Using the General Social Survey, calculate a 95% confidence interval for the percentage of Americans in favor of requiring gun permits (GUNLAW).
NIBRS 1 - Burglary
Calculate 95% confidence intervals for arrestee age.
NIBRS 2 - Burglary
Calculate 95% confidence intervals for victim age.
NIBRS 3 - Burglary
Calculate 95% confidence intervals for offender age.
NIBRS 4 - Burglary
Calculate a 95% confidence interval for number of premises entered.
