FiltersDone

Question type

Essay

Multiple Choice

Short Answer

True False

Matching

Exam 4: Summarizing Data: Variability

Show Answer

Share

---

All types

Filters

Study FlashcardsPractice ExamLearn

Question 21

True/False

Review LaterAdd Note

Review Later

As a general rule,an interquartile range is a better estimate of variability than the IQR.

Correct Answer

verified

Show Answer

Question 22

Multiple Choice

Review LaterAdd Note

Review Later

The sum of the squared deviations of scores from their mean

A) is computed the same for samples and populations.
B) is computed by squaring each deviation to avoid a zero solution in the numerator.
C) is the numerator for the sample variance and population variance.
D) all of these.

Correct Answer

verified

Show Answer

Question 23

Multiple Choice

Review LaterAdd Note

Which of the following values is NOT needed to compute sample variance using the computational formula,but is needed to compute the definitional formula?

Suppose a researcher observes a population of 12 people and computes SS = 192.In this example,the standard deviation is 4.

A researcher records the following scores for attention during a video game task for two samples.Which sample has the largest standard deviation? Sample A: 10,12,14,16,and 18 Sample B: 20,24,28,32,and 36

Suppose a researcher selects a sample of 19 participants and computes SS = 162.In this example,the standard deviation is 3.

The SIQR can be defined as

A researcher measures the time (in seconds) it takes a sample of 26 participants to respond to a stimulus presented on a computer screen.The standard deviation for response times is 6.In this example,what is the value for SS?

Multiplying or dividing each score using the same constant will not change the standard deviation.

Measures of variability can range in value from

A main disadvantage of computing a range is that it takes into consideration only two values regardless of the number of scores in a distribution.

A main disadvantage of computing a range is that it is a simple and quick measure of variability.

On average,the sample variance will be equal to the population variance only when dividing SS by df.

A researcher records the following scores for an Olympic gymnast following her routine: 9.9,9.8,9.6,9.5,9.7,9.1,8.9,and 9.8.What is the range for the scores?

The definitional formula ______ the computational formula for SS.

A(n) ________ is a sample statistic that equals a population parameter on average.

The computational formula for the variance requires that you know the value of the mean.

The degrees of freedom for sample variance are equal to N.

If all scores in a distribution are negative values,then the standard deviation will also be a negative value.

The variance and standard deviation can never be