Define the following the terms using two services. Be sure you cite and in APA. Last use each word in one sentence.

sample population sampling frame parameter statistic sampling error standard error sample bias sample design sampling fraction probability sample nonprobability sample sampling unit simple random sampling systematic sampling skip interval stratified random sampling proportionate stratified sampling disproportionate stratified sampling cluster sampling multistage sampling convenience sampling panel survey purposive sampling quota sampling selection bias snowball sampling sampling error nonsampling error confidence level confidence interval accuracy population variability standard deviation unit of analysis power