Pearson product-moment correlation coefficient
The Pearson product-moment correlation coefficient, r, requires that variables be measured with _____________.
a. An interval or ratio scale.
b. An ordinal or ratio scale.
c. A nominal or ordinal scale.
d. A nominal or ratio scale.
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Two point charges of +2.0 oC and -6.0 oC are located on the x-axis at x = -1.0 cm and x = +2.0 cm respectively. Where should a third charge of +3.0 oC be placed on the + x-axis so that the potential at the origin is equal to zero?
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