4 A researcher wants to estimate the mean grade point average of all current college students in the United States. She has developed a procedure to
standardize scores from colleges using something other than a scale between 0 and 4. How many grade point averages must be obtained so that the sample
mean is within 0.1 of the population mean? Assume that a 90% confidence level is desired. Also assume that a pilot study showed that the population
standard deviation is 0.88.
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