Help with Homework for Research method of the science

timer Asked: Sep 29th, 2015

Question description

  1. The _____________ variable is manipulated (changed) by the experimenter, so that the impact on the _________________ variable can be measured.

    dependent; independent

    independent; dependent

    controlled; dependent

    independent, controlled

Question 2

  1. Which statement below best represents a null hypothesis for an experiment?

    There is no difference in the biological activity of Drug A and Drug B.

    Drug A is more biologically active than drug B.

    Drug B is more biologically active than Drug A.

    Failure to include a control group in an experiment might lead to Drug A being more active biologically than Drug B.

Question 3

  1. All experiments that involve making measurements are susceptible to random error (see page 6 in Marder if you have forgotten the definition of random error.)  As described in Chapter 2 of Marder, a number of solutions are available to a scientist to address the problem of error in experimentation.  Which of the following  is the least likely method that a scientist would use to control error in an experiment?

    Compute sample averages, standard deviations and standard error of the mean as part of error analysis.

    Graph each measurement, show the sample mean and add error bars to see if the error bars overlap for the samples measured as part of error analysis.

    Increase expenditure of money for the experiment to be able to maximize the amount of data collected to improve the accuracy of the experiment.

    Perform statistical testing such as t tests or chi 2 tests to determine if the results could be due to chance alone as part of error analysis.

Question 4

  1. In the space below, explain your current understanding of the difference between an Alternate Hypothesis and a Null Hypothesis.  Then, give one example of an Alternate Hypothesis and Null Hypothesis.

    Question 5

    1. So far in this course, you have read parts of two journal articles which describe primary research - Senn et al., 2015 and Mitro et al., 2012.  Reading research articles (primary sources) is very different and more difficult than reading a textbook.  So far, what did you find to be the hardest part of reading these journal articles?  What strategies do you find to be helpful when reading these articles (e.g. annotation is one strategy)?

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