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Math Help - (Business Statistics) Confidence interval question.

  1. #1
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    (Business Statistics) Confidence interval question.

    Hi everyone, can some1 kindly help me on these questions below. Thanks in advance!

    Question 1.

    A random sample of 49 people revealed that they listened to the radio and average (mean) of 40 minutes per day with a standard deviation of 14 minutes. Develop a 90% and 95% confidence interval for the population mean listening time.

    1.Develop a 90% confidence interval for the population mean listening time.
    2.Develop a 95% confidence interval for the population mean listening time.
    3.Which of the two confidence intervals is wider?
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  2. #2
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    Re: (Business Statistics) Confidence interval question.

    Quote Originally Posted by botakhenry View Post
    Hi everyone, can some1 kindly help me on these questions below. Thanks in advance!

    Question 1.

    A random sample of 49 people revealed that they listened to the radio and average (mean) of 40 minutes per day with a standard deviation of 14 minutes. Develop a 90% and 95% confidence interval for the population mean listening time.

    1.Develop a 90% confidence interval for the population mean listening time.
    2.Develop a 95% confidence interval for the population mean listening time.
    3.Which of the two confidence intervals is wider?
    What have you tried? Where are you stuck?
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