Scenario: Is there a relationship between worker type (X) and productivity (Y)? The researcher defined worker type (X) as blue or white collar, and productivity (Y) as "high" or "low". Question: What is the scale of measurement for variable Y in this scenario? Scale, Ordinal or Nominal?

Two correlated variables may have no true relationship. True or false The correlation coefficient (r) tells us what percent of the variation in the dependent variable is explained by variation in the independent variable.  True or False Regression analysis can be linear or nonlinear.  True or False

When discussing regression analysis for cost estimation the y-variable is referred to as the O explanatory variable dependent variable. O independent variable. O predictor variable.

Shelia's doctor is concerned that she may suffer from gestational diabetes (high blood glucose levels during pregnancy). There is variation both in the actual glucose level and in the blood test that measures the level. In a test to screen for gestational diabetes, a patient is classified as needing further testing for gestational diabetes if the glucose level is above 120 milligrams per deciliter (mg/dL) one hour after a sugary drink. Shelia's measured glucose level one hour after the sugary drink varies according to the Normal distribution with μ = 105 mg/dL and σ = 15 mg/dL. (Round your answers to four decimal places.) (a) If a single glucose measurement is made, what is the probability that Shelia is diagnosed as having gestational diabetes?(b) If measurements are made on three separate days and the mean result is compared with the criterion 120 mg/dL, what is the probability that Shelia is diagnosed as needing further testing for gestational diabetes?