# 2) Below is the data for a personality questionnaire measuring conscientiousness. These data were taken from...

###### Question:

2) Below is the data for a personality questionnaire measuring conscientiousness. These data were taken from a random sample of 16 undergraduate psychology majors. In the general population, scores on this questionnaire are normally distributed with a mean (p) of 50. You hypothesize that this sample is not representative of the general population. Specifically, you hypothesize that psychology students form a distinct sub-population, with DIFFERENT conscientiousness, relative to the general population. That is, it would be equally interesting to find out they have higher or lower conscientiousness. Conduct a one-sample t-test by answering the following questions. Data: N # 16, xbar (sample mean)-55.100, s.-7.17 a. State the null and alternative hypotheses. b. Are you going to be using a one- or two-tailed test? Explain the reason for your choice. c. What are the degrees of freedom for this t-test? Find the corresponding critical t-value for Type I error rate (alpha) of a 0.05? d. Calculate your observed t-statistic. e. Compare your observed t-statistic to the critical t-value(s). What do you conclude regarding the null hypothesis? f. Calculate and interpret the 95% confidence interval g. Calculate and interpret the standardized effect size (Cohen's d) h. What do you conclude about your research question (use your own words in everyday language)

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