Psychology Quiz 3

A statistically significant difference between two sample groups is NOT likely to be...

due to chance variation within and between the sample groups.

A sample average can be used to estimate a population average with greater precision if the sample is...

large.

The median of a distribution of scores is the...

middle score in a distribution of scores.

Professor Woo noticed that the distribution of her students' scores on the last biology test had an extremely small standard deviation. This indicated that the...

students' scores tended to be very similar to one another.

Measurements of central tendency are most useful for...

summarizing data.

The difference between the highest and lowest scores in a distribution is the...

Range

With 11, 7, 21, 14, and 7, what is the range?

14

Which of the following provides the best guidance on investigating the significance of an observed difference between two research samples?

Inferential statistics

Remember

Less than 5%.

Which of the following is a measure of the degree of variation among a set of scores?

Standard Deviation

To decide whether observed differences between samples reflect actual differences between populations, you should determine the _____ of the observed differences.

Statistical Significance

The mean of a distribution of scores is the...

arithmetic average of all the scores.

The average price for different bands of toothpaste could be visually displayed in a(n)...

bar graph.

Psychologists' personal values and goals...

can bias their observations and interpretations.

The mode, median, and mean are measures of...

central tendency.

When an arithmetic average is reported in the news, it is most important for readers to...

consider whether it is distorted by a few extreme cases.

The mode, median and means are most likely to have different values when they...

describe a skewed distribution.

When results of an experiment reveal minimal variability between subjects, it is most likely to be...

reliable.

Statistical reasoning can help us to generalize correctly from a...

sample to a population.

Statistical reasoning can help us to generalize, correctly from a

sample to a population.

A lopsided set of scores that includes a number of extreme or unusual values is said to be...

skewed.

As the size of a representative sample increases, the ____ of that sample is most likely to decrease.

standard deviation

Differences between two sample averages are most likely to be statistically significant if...

the difference between the samples is large.

When a difference between two groups is statistically significant, this means that...

the difference is not likely to have occurred on its own, without the benefit of the independent variable.

The range and standard deviation are measures of...

variation.