Each month the U. S. Census Bureau's American Community Survey mails survey forms to 250,000 households asking questions about demographic, social, economic, and housing characteristics such as mortgage and utility costs. Telephone calls are made to households that don't return the form. In one month, responses were obtained from 240,000 of the households contacted. A source of bias in this survey is

a. voluntary response
b. the fact that the survey was not double-blind
c. nonresponse
d. only U. S. households were contacted

Δabc is dilated by a scale factor of 3 with the origin as the center of dilation to form δa′b′c′. the slope of is -1.2. the length of is p units, the length of is q units, and the length of is r units. the slope of is . the length of is units.

Select the correct answer and solve for y

Use the given degree of confidence and sample data to construct a confidence interval for the population mean mu . assume that the population has a normal distribution. a laboratory tested twelve chicken eggs and found that the mean amount of cholesterol was 185 milligrams with sequals 17.6 milligrams. a confidence interval of 173.8 mgless than muless than 196.2 mg is constructed for the true mean cholesterol content of all such eggs. it was assumed that the population has a normal distribution. what confidence level does this interval represent?