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Q1) Placement exam is provided to 36 randomly chosen college students. Their mean score is 63.6 with standard deviation of 15.1 points. Create a 90% confidence interval for mean score on this placement exam for all students.

a) 23.48 < = mean <= 27.32

b) 2.42 <= mean <=3.98

c) 59.46 < = mean < = 67.74

d) 17.70 < = mean < = 18.90

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