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lexi

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  • Statistics help?

    Is this true or false?

    If the consequences of making a type 1 error are severe, then the significance level for a hypothesis test should be set at a lower value.

    Mathematics2 months ago
  • Statistics help?

    A book on her survey indicates that 65% of US households own book. A random sample of 98 households is obtained. 

    What is an accurate description of the sampling distribution of p̂ for samples of n=98?

    In a random sample of 98 households, what is the probability that the proportion of households that own a book is greater than 75%? 

    In a random sample of 98 households would it be unusual to find only 60 that had a book?

    Personal Finance2 months ago
  • Statistics help?

    To researchers, Lexi and Alex are each constructing confidence interval for the proportion of the population is left-handed. Using the same sample they both obtain a sample proportion of 0.12. Lexi computes a confidence interval of (0.113, 0.161) while Alex computes an interval of (0.085, 0.155). Which interval is incorrect?

    Mathematics2 months ago
  • Statistics help?

    A researcher asked individuals to discuss the number of books that they read in the first half of 2020. Based on similar prior studies, a reasonable value for the standard deviation of these results is 8.3 books. 

    How many subjects are needed to estimate the average number of books that Americans have read in the first half of 2020 within .5 bucks but 95% confidence?

    Personal Finance2 months ago
  • Statistics help?

    A researcher uses a simple random sample of 157 Americans to calculate a 95% confidence interval for the proportion of Americans that support eliminating the penny. The computations are then given to you for review.

    The proportion of the sample that support eliminating the penny is 0.771. The lower bound of the researchers confidence interval is 0.705. The upper bound of the confidence interval is smudged and cannot be read. 

    What must be the upper bound of the researchers interval?

    Is it possible that the proportion of the population that supports the elimination of the penny is actually 64%?

    Personal Finance2 months ago