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An article investigated the consumption of caffeine among women. A sample of 43 women were asked...

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Statistics

An article investigated the consumption of caffeine among women.A sample of 43 women were asked to monitor their caffeine intakeover the course of one day. The mean amount of caffeine consumed inthe sample of women was 243.872 mg with a standard deviation of209.05 mg. In the article, researchers would like to include a 90%confidence interval.   

  • The values below are t critical point corresponding to 90%,95%, 98%, and 99% confidence. Which critical point corresponds to90% confidence?
    • 1.682
    • 2.698
    • 2.418
    • 2.018
  • With 90% confidence, we estimate the mean amount of caffeineconsumed by women is between  mg and  mg.(Round the limits of your interval to 4 decimal places.)
  • If the level of confidence were changed to 99%, what effectwould this have on the width of the calculated confidence interval?
    • the interval would narrow
    • the interval would widen
    • there would be no effect on the interval

Answer & Explanation Solved by verified expert
4.4 Ratings (862 Votes)
Here we have to compute confidance interval for meanwe know thatfrom t tableTherefore option 1 is correctcritical    See Answer
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