Confidence interval for the average time


1) A random sample of 60 college graduates results in a mean time to graduate of 4.58 years, with a standard deviation of 1.10 years. Construct and interpret a 98% confidence interval for the average time to graduate with a bachelor's degree.

2) In1995 38% of adolescents stated they prayed daily. A researcher wanted to know wheter this percentage has risen since then. He surveys 40 adolescents and finds that 20 pray on a daily basis. Is this evidence that the proportion of adolescents who pray daily has oncreased at the a=0/05 level of significance?

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Basic Statistics: Confidence interval for the average time
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