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A rаndоm sаmple оf 100 cоllege grаduates about the lengths of time required to earn their bachelor's degrees. The mean was 4.23 years and the standard deviation was 1.97 years. Construct a 90% confidence interval for the mean time required to earn a bachelor's degree by all college students. Also interpret the confidence interval. A bachelor's degree is traditionally designed to take 4 years. Use the confidence interval in part (a) to answer the following question and explain how you determined your answer. “Is there evidence at 10% significance level to say the mean time required to earn a bachelor's degree is differs from 4 years?” Explain.