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Discovering Statistics

Statistics

Quiz 10 :

Comparing Two Means

Quiz 10 :

Comparing Two Means

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What does a negative t-statistic suggest?
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Multiple Choice
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Answer:

B

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How is a t-statistic calculated?
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Answer:

A

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When comparing pre-competition arousal scores in novice and expert tennis players you find that the scores for the novice group are not normally distributed. What test should be run to see if arousal scores are statistically different?
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Multiple Choice
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Answer:

B

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Which of the following t-tests has a different research design?
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Analyse the heart rate data collected during a VO2 max test. The data points (observations) were collected at the point the lactate threshold occurred (the point at which blood lactate deviates from resting concentrations) before and after a six-week aerobic training programme. Interpret the SPSS output and decide whether the two data sets are normally distributed. img
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According to Cohen, how might this effect size be interpreted?
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Run an independent t-test on the data. A Levene's test result of p = .006 was obtained. What can we infer from this number?
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Suppose we wanted to apply a one-tailed test as opposed to a two-tailed test. How would we covert a significance of p = .284?
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Which of the following is not a form of t-test?
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How might you classify the measurement scale for the variable labelled as cancer?
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Once you have the significance value of the t-test, it is beneficial to calculate the effect size. Cohen's d is a measure of effect size. How is it calculated?
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Analyse the data below related to days survival following surgery from either stomach or lung cancer. What is the result of the Kolmogorov-Smirnov test for the patients who survived stomach cancer? img
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How might you classify the measurement scale of the survival rate (days)?
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Assume that for the research into stomach and lung cancer the significance value is set at p < .05 and an independent t-test yielded a significance value of p = .06. What should you do?
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What is the effect size for the cancer survival data?
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Which of the following expressions best represents the degrees of freedom?
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When analysing the result of the paired samples t-test, the output presents the following box, but what do the results show you? img
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Examine the following SPSS output from the heart rate data. Based on 11 degrees of freedom, working to a two-tailed significance value of .05, the critical value for t is 2.201. What can you assume from the output? (The significance value has been omitted on purpose.) img
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If a significance result of .000 is presented, how should this be reported?
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What is the correct result for the independent t-test?
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