Exam 4: Measures of Variability

The question below refers to the following situation: A university's administration is interested in understanding students' study habits. The School randomly surveys 13 students and asks them how much time per weeknight they Typically spend studying. The following are the responses in minutes: 60, 90, 120, 120, 150, 180, 180, 180, 180, 210, 240, 270, 300 What is the median?

The range is useful for:

The question below refers to the following situation: Below are two distributions of final scores for separate statistics courses. The first is from the Fall term, the second is from the Spring term. The range for the Fall is __________.

Given the following distribution of quiz scores for a statistics course: 87, 91, 74, 73, 80, 84, 68, 75 What is the range?

For a somewhat normal distribution, the range is approximately equal to how many times The standard deviation?

The standard deviation is a measure of __________.

Another synonym for variability is:

Find the standard deviation for the following frequency distribution of the hours spent at a youth recreation center on a Saturday night by a sample of 20 teenagers:

Standard deviation can only be used for variables measured at which level?

The question below refers to the following situation: Below are two distributions of final scores for separate statistics courses. The first is from the Fall term, the second is from the Spring term. As this example illustrates, a disadvantage of the range is that it is __________ than the standard deviation.

The question below refers to the following situation: A university's administration is interested in understanding students' study habits. The School randomly surveys 13 students and asks them how much time per weeknight they Typically spend studying. The following are the responses in minutes: 60, 90, 120, 120, 150, 180, 180, 180, 180, 210, 240, 270, 300 What is the mode?

The question below refers to the following situation: A university's administration is interested in understanding students'study habits. The School randomly surveys 13 students and asks them how much time per weeknight they Typically spend studying. The following are the responses in minutes: 60, 90, 120, 120, 150, 180, 180, 180, 180, 210, 240, 270, 300 Calculate the standard deviation.

The preceding raw-score formula defines:

The question below refers to the following situation: Below are two distributions of final scores for separate statistics courses. The first is from the Fall term, the second is from the Spring term. What do the different standard deviations between the Fall and Spring statistics courses indicate?

Which of the following is a measure of variability?

The question below refers to the following situation: A university's administration is interested in understanding students' study habits. The School randomly surveys 13 students and asks them how much time per weeknight they Typically spend studying. The following are the responses in minutes: 60, 90, 120, 120, 150, 180, 180, 180, 180, 210, 240, 270, 300 Calculate the mean.

Dispersion is synonymous with variability.

The mean of the squared deviations is better known as:

The question below refers to the following situation: Below are two distributions of final scores for separate statistics courses. The first is from the Fall term, the second is from the Spring term. The range for the Spring is __________.

The following distribution represents 8 quiz scores: {100, 98, 98, 96, 95, 90, 86, 78}. Please calculate the range.