The following diagram shows one indifference curve representing the preferences for goods X and Y for one consumer. 
What is the marginal rate of substitution between points A and B?
Definitions:
Two-tailed
A test in statistics where the critical area of a distribution is two-sided and tests whether a sample is greater than or less than a certain range of values.
Zero-tailed
Refers to a type of hypothesis test in statistics where the area of interest is on one extreme end of the distribution curve, indicating whether a sample mean is either significantly higher or lower than the population mean.
Random Assignment
The use of random selection to assign research participants to experimental groups.
Control Group
In experimental research, a group that does not receive the experimental treatment and is used as a benchmark to measure the effects of the treatment.
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