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    Confounding Variables

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    Is there a difference in mean needle length between the two species?
    How to get rid of confounding variables?

    Pine A out of 35 needles the mean is 7.66 inches
    Pine B out of 35 needles the mean is 10.64 inches

    Pine A : 7.75, 7.10, 8.05, 8.40, 6.50, 7.90 7.55, 8.55, 7.40, 8.55, 6.10, 7.05, 8.10, 6.25, 5.90, 7.60, 7.25, 8.00, 7.60, 6.95, 7.00, 7.05, 6.10, 6.85, 7.15, 8.55, 5.65, 8.00, 6.70, 6.55, 6.00, 5.65, 6.50, 8.10, 7.65

    Pine B : 12.15, 12.05, 10.40, 12.00, 12.00, 11.90, 11.50, 12.05, 10.50, 10.00,12.15, 11.80, 12.10, 11.40, 11.25, 11.40, 11.80, 11.95, 12.00, 11.10, 9.95, 11.80, 12.00, 11.85, 10.95, 11.20, 9.25, 10.90, 10.60, 12.00, 11.00, 11.45, 9.85, 11.90, 9.80

    Please answer the following and provide the following:
    1. present raw data graphically for each species
    2. data summarized graphically for each and labeled
    3. trends visible and explained
    4. mean needle lengths for both displayed on comparative graphs with error bars
    5. state appropiate sample size and implications
    6. conduct test of statistical significance comparing the length of both
    - hypotheses (null and alternative)
    - give equation used and degree of freedom
    - give P value and interpretation
    7. give 90% confidence interval for each species mean individually
    - give equation used and degree of freedom
    - give the 2 confidence intervals and meaning
    8. conclusion of the study

    © BrainMass Inc. brainmass.com April 3, 2020, 2:02 pm ad1c9bdddf
    https://brainmass.com/statistics/confounding-variable/confounding-variables-20581

    Solution Summary

    Is there a difference in mean needle length between the two species?
    How to get rid of confounding variables?

    Pine A out of 35 needles the mean is 7.66 inches
    Pine B out of 35 needles the mean is 10.64 inches

    Pine A : 7.75, 7.10, 8.05, 8.40, 6.50, 7.90 7.55, 8.55, 7.40, 8.55, 6.10, 7.05, 8.10, 6.25, 5.90, 7.60, 7.25, 8.00, 7.60, 6.95, 7.00, 7.05, 6.10, 6.85, 7.15, 8.55, 5.65, 8.00, 6.70, 6.55, 6.00, 5.65, 6.50, 8.10, 7.65

    Pine B : 12.15, 12.05, 10.40, 12.00, 12.00, 11.90, 11.50, 12.05, 10.50, 10.00,12.15, 11.80, 12.10, 11.40, 11.25, 11.40, 11.80, 11.95, 12.00, 11.10, 9.95, 11.80, 12.00, 11.85, 10.95, 11.20, 9.25, 10.90, 10.60, 12.00, 11.00, 11.45, 9.85, 11.90, 9.80

    Please answer the following and provide the following:
    1. present raw data graphically for each species
    2. data summarized graphically for each and labeled
    3. trends visible and explained
    4. mean needle lengths for both displayed on comparative graphs with error bars
    5. state appropiate sample size and implications
    6. conduct test of statistical significance comparing the length of both
    - hypotheses (null and alternative)
    - give equation used and degree of freedom
    - give P value and interpretation
    7. give 90% confidence interval for each species mean individually
    - give equation used and degree of freedom
    - give the 2 confidence intervals and meaning
    8. conclusion of the study

    $2.19

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