A random sample of n  16 individuals is selected
from a population with μ  70, and a treatment is
administered to each individual in the sample. After
treatment, the sample mean is found to be M  76
with SS  960.
a. How much difference is there between the mean for
the treated sample and the mean for the original
population? (Note: In a hypothesis test, this value
forms the numerator of the t statistic.)
b. How much difference is expected just by chance
between the sample mean and its population mean?
That is, find the standard error for M. (Note: In a
hypothesis test, this value is the denominator of the
t statistic.)
c. Based on the sample data, does the treatment have
a significant effect? Use a two-tailed test with
 .05.
11. The spotlight effect re