Data on the weekly sales of room air conditioning units were matched with the average temperature and calculations produced sample correlation coefficients, r, in the range of –0.75 and –0.83. which of the following statements best expresses a conclusion that can be drawn from the values of r?

this cannot be determined from the information given.
as the temperature decreases, the number of room air conditioners sold decreases.
there is no relationship between temperature and sales.
as the temperature increases, the number of room air conditioners sold decreases.

D. As the temperature increases, the number of room air conditioners sold decreases.

Explanation:

As the temperature increases, the number of room air conditioners sold decreases.

Data on the weekly sales of room air conditioning units were matched with the average temperature and calculations produced sample correlation coefficients, r, in the range of –0.75 and –0.83. Since, the correlation coefficients are negative there is an inverse relation between the two quantities therefore As the temperature increases, the number of room air conditioners sold decreases.

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia