1. As a psychobiologist, you are interested in the effect of two new drugs on th

Question

1. As a psychobiologist, you are interested in the effect of two new drugs on the electrical charge of a neuron membrane. In addition to observing general differences between the two drugs (drug X and drug Y), you want to see whether their effects vary at different temperatures. Therefore, you design an experiment whereby you inject the drugs into a giant squid's large neurons that have been kept alive in a saline solution. You inject drug X into four neurons at 20°C (normal room temperature) and four neurons at 37°C (normal human body temperature). You then repeat the procedure using drug Y. For each presentation of the drug, you measure the change in the electrical charge ( in millivolts) of the neuronal membrane. Which statistic should you use to analyze the data?

    a. Chi-Square

    b. an ordinal statistic

    c. t-test

    d. One-Way ANOVA

    e. Two-Way ANOVA

2. Amanda believes that large doses of Vitamin C can prevent cancer. She gives 30 rats a 6 month diet high in Vitamin C. Another 30 rats get a diet with moderate doses of Vitamin C, and a third group of 30 rats get no Vitamin C. After the 6 month trial she injects all rats with a carcinogen, waits 1 year, and then measures the number of cancer cells in their bodies after 1 year. Which statistic should Amanda use to analyze the data?

    a. Chi-Square

    b. an ordinal statistic

    c. t-test

    d. One-Way ANOVA

    e. Two-Way ANOVA

3. Sara believes that a cup of coffee makes you drive better in the morning. She separates a group of 100 participants into two groups of 50. Both groups are tested on a driving test at 7am. One group receives coffee before the test and the other receives no coffee before the test. The test measures how fast they can drive through a set of cones without making a mistake. They can get a score of -100 to +100 on the driving test. Which statistic should Sara use to analyze the data?

    a. Chi-Square

    b. an ordinal statistic

    c. t-test

    d. One-Way ANOVA

    e. Two-Way ANOVA

4. Gary asks a group of freshman and a group of seniors if they approve of the war in Iraq. He then compares the number of freshman who said "yes" to his question to the number of seniors who said "yes" to his question. Which statistic should Gary use to analyze the data?

    a. Chi-Square

    b. an ordinal statistic

    c. t-test

    d. One-Way ANOVA

    e. Two-Way ANOVA

5. Alison asks a group of male college students and a group of female college students to rank their top three ice cream flavors. She then compares their choices across gender. Which statistic should you use to analyze the data?

    a. Chi-Square

    b. an ordinal statistic

    c. t-test

    d. One-Way ANOVA

    e. Two-Way ANOVA

Explanation / Answer

Question 1:

The two-way ANOVA compares the mean differences between groups that have been split on two independent variables (called factors). The primary purpose of a two-way ANOVA is to understand if there is an interaction between the two independent variables on the dependent variable.

Here we have an independent variable temperature.

This is the case of Two way ANOVA and therefore e) is the correct answer here.

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