A researcher wishes to estimate the average time spent studying per week by students at a particular university. A random sample of 150 students was selected and asked how many hours per week they studied. The average for the sample was 6.4 hours and the standard deviation for the sample was 1.8 hours. Construct a 95 % confidence interval for the mean (average) time spent per week by all the students at the university. Interpret this interval.
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