The Phase Diagram for Helium-4 Indicates That

question 16

Multiple Choice

The phase diagram for helium-4 indicates that

• A) helium has three phases.
• B) helium has two liquid phases.
• C) helium can be liquefied at ordinary pressures.
• D) helium exists as He(g) and He(l) at about 2 K.
• E) helium exists only as a gas.

Distinguish between the roles of dependent and independent variables in regression analysis.

Recognize the significance and interpretation of positive or negative y-intercepts in regression analysis.

Understand the impact of the coefficient of correlation on the regression model and its interpretation.

Recognize that a strong correlation does not imply causation between variables.