Two random samples of sizes 30 and 36 are selected independently from two populations with means 80 and 88,and standard deviations 15 and 20,respectively.
a.Find the standard error of the difference between
and
.
b.Find the probability that the mean of the first sample is smaller than the mean of the second sample.
Definitions:
Infants
Very young children, especially those under one year of age.
Accuracy
The degree to which a measurement, calculation, or specification conforms to the correct value or a standard.
Visual Preference
The tendency to favor visual inputs or stimuli over those from other senses such as touch or hearing.
Robert Fantz
An American psychologist known for his research on infants' perception and cognition, notably the visual preference method.
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