Statement (I): Effective temperature is an index which correlates the combined effect of air temperature, air humidity and air movement upon human thermal comfort.

Statement (II): Thermal comfort is not affected by mean radiant temperature. 

Human Comfort and Effective temperature: Human comfort in the air conditioning can be defined as comfort which is experienced by a person through adjustment of dry bulb temperature, relative humidity and air velocity.

The effective temperature is the temperature of the saturated environment at which motionless saturated air would induce same level of comfort as experienced in a normal environment in a sedentary worker wearing ordinary indoor clothing.

From the above definition we can say that Statement I) is correct.