PSYC1040 Tute 8

Which of these is not one of the scientific principles?

• Empiricism

• Openness

• Skepticism

• Reliability

• Tentativeness

In experimental research designs, a confound:

• is a variable that varies systematically with the levels of the IV

• can provide an alternative explanation for any differences observed

• is not controlled by the experimenter

• is all of the above

Box-and-whisker plots do not display:

• the median

• the range

• the variance

• continuous data

• the interquartile range

A researcher has measured PSYC1040 students’ anxiety about their assignment. If the following table is the frequency of different responses, what order would the measures of central tendency have?

• Mean < Mode < Median

• Mode < Median < Mean

• Median < Mode < Mean

• Mean < Median < Mode

• Mean ≈ Median ≈ Mode

A researcher has developed a new measure of anxiety that asks questions like “when you think about giving a public talk, do you feel nervous?” However, scores on the measure do not correlate with a user’s self-rated usual experience of anxiety on a 10-point scale. What is this measure lacking?

• Face validity

• Internal validity

• Construct validity

• Test-retest reliability

• None of the above

Approximately what percentage of people have an IQ (μ = 100, σ = 15) between 121 and 133?

• 6.7%

• 13.4%

• 41.9%

• 55.3%

• 90.5%

If the average time to run a marathon was 2:18:44 with a standard deviation of 06:03, approximately what percentage of competitors would be beaten by a runner with a time of 2:10:30

• 8.69%

• 35.99%

• 41.31%

• 70.61%

• 91.31%

If the shared variance between two variables is 64%, what do we know about the relationship?

• It is a weak relationship

• The correlation coefficient is approximately .41

• 36% of the variance in each variable is unexplained by the other

• The relationship is positive, with a correlation coefficient of +.80

• At least one of the variables is ordinal

Which of the following is not a step in the calculation of Pearson’s correlation coefficient?

• Removing scores that do not have a matching pair in the other variable

• Calculating the Mean and Standard Deviation of the two variables

• Converting the scores to Z-scores

• Subtracting the Z-scores from their mean and squaring them

• Dividing the sum of the Z-products by the number of pairs of data

The average global height is 168.5cm with a standard deviation of approximately 6.5cm. A researcher wants to know if their students are statistically taller than average, with a higher level of certainty than usual. If they conduct a one-tailed test with a 1% significance level, what conclusion should they draw for a random sample of 25 students with a mean of 171.5cm?

• Z = 0.46, retain the null hypothesis

• Z = 1.98, reject the null hypothesis

• Z = 1.98, retain the null hypothesis

• Z = 2.31, reject the null hypothesis

• Z = 2.31, retain the null hypothesis