1 answer

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 (Cohens d) h. What do you conclude about your research question (use your own words in everyday language)
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)

Answers

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