psy stats

For the following grouped frequency distribution table of exam scores, how many students had scores lower than X = 75?

1

What is the value of SS (sum of squared deviations) for the following population? Population: 1, 1, 1, 5

12

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

4 points

What is the range for the following set of scores obtained for a discrete variable for which 0 is not a possible score? Scores: 5, 7, 9, 13

8 points

One sample with n = 4 scores has a mean of M = 12, and a second sample with n= 6 scores has a mean of M = 8. If the two samples are combined, what is the mean for the combined set of scores?

M = 9.6

Which of the following statements must be false regarding a distribution of scores?

No individual has a score exactly equal to the mode

The main distinction between an interval and ratio scale of measurement is that _____.

a score of 0 on a ratio scale represents the complete absence of that variable.

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

discrete

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

nominal

Which term is used to describe the shape of a frequency distribution graph in which most scores pile up on the left-hand side of the graph and taper off to the right?

positively skewed

A biologist records the number and types of fish caught in a local lake during a 2- year period. The biologist reports that 7% of the fish caught during this period were trout, whereas 43% of the fish caught were bass. These reports of the number of trout and bass at this lake are examples of _____.

relative frequencies

A set of 5 scores has SS = 20. If the scores are from a sample, the sample variance is ____. If the scores comprise a population, the population variance is ____.

s2 = 5; σ2 = 4

The average verbal SAT score for the entire class of incoming college freshmen in the United States is 530. However, if a sample of 20 incoming college freshmen is randomly selected from the United States, it is likely that this sample's average verbal SAT score will not be exactly 530. This is consistent with the concept of _____.

sampling error

In contrast to a datum, which of the following descriptions is most consistent with the concept of data?

the individual scores of 15 participants on a problem-solving task

A population of N = 5 scores has a mean of µ = 8. If one score with a value of X= 4 is removed from the population, what is the value for the new mean?

µ = 9

Which of the following symbols identifies the population standard deviation?

σ

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 = 1