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Researchers collected a simple random sample of the times that it took 155 college students to earn their bachelor's degrees.The sample mean was 4.73 years

Researchers collected a simple random sample of the times that it took 155 college students to earn their bachelor's degrees.The sample mean was 4.73 years with a standard deviation of 1.99 years. (National Center for Education Statistics, 2008) Use a significance level of 0.05 to test the claim that the mean time for college students to complete their bachelor's degrees is more than 4.5 years.

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