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# Discovering Statistics

Statistics

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## Quiz 10 : Comparing Two Means

What does a negative t-statistic suggest?
Free
Multiple Choice

B

How is a t-statistic calculated?
Free
Multiple Choice

A

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?
Free
Multiple Choice

B

Which of the following t-tests has a different research design?
Multiple Choice
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.
Multiple Choice
According to Cohen, how might this effect size be interpreted?
Multiple Choice
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?
Multiple Choice
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?
Multiple Choice
Which of the following is not a form of t-test?
Multiple Choice
How might you classify the measurement scale for the variable labelled as cancer?
Multiple Choice
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?
Multiple Choice
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?
Multiple Choice
How might you classify the measurement scale of the survival rate (days)?
Multiple Choice
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?
Multiple Choice
What is the effect size for the cancer survival data?
Multiple Choice
Which of the following expressions best represents the degrees of freedom?
Multiple Choice