Statistics

Which of the following is not an appropriate interval width to use when constructing a grouped frequency distribution table?

4 points

Which of the following is not a unique advantage of the interquartile range as measure of variability?

The interquartile range can be used for data measured with a ratio scale of measurement.

Which statement below is correct regarding a grouped frequency distribution table?

The ∑X cannot be determined.

If it is impossible to divide the existing categories of a variable, then it is an example of a(n) _____ variable.

discrete

A recent study reported that students who just finished playing a prosocial video game were more likely to help others than students who had just finishing playing a neutral or antisocial game. For this study, the kind of game given to the students was the _____.

independent variable.

The mode is the only measure of central tendency that is appropriate to utilize for a variable measured with which scale of measurement?

nominal

The students in a psychology class seem to think that the midterm exam was very difficult. If they are correct, what is the most likely shape for the distribution of exam scores?

positively skewed

What scale of measurement is being used when a researcher measures the amount of car accidents that participants have been involved in during their lifetime?

ratio

Which symbol below identifies the sample variance?

s2

In order to determine if 10 points below the mean on an exam is an extreme negative score, the _____ needs to be known.

standard deviation

A characteristic, usually a numerical value, which describes a sample is called a

statistic.

A researcher is measuring the amount of time needed to solve a set of anagrams for a sample of n = 15 students. However, one of the participants fails to solve the problems so the researcher has an undetermined score. What is the best measure of central tendency for these data?

the median

Which of the following values for the population standard deviation would cause a score located above the mean average to have the most extreme position in the distribution?

σ = 4 A population standard deviation of 1 would cause a score located above mean average to have the most extreme position in the distribution as the value is less than or equal to 1