Stats Quiz 9 Measure of Central Tendency

False

A deviation score is the same thing as a raw score.

12.38

A history professor gives a quiz to his class and records the following scores: 13, 11, 11, 9, 12, 13, 16, 14, 11, 10, 8, 13, 20.

3.12

A history professor gives a quiz to his class and records the following scores: 13, 11, 11, 9, 12, 13, 16, 14, 11, 10, 8, 13, 20. The standard deviation for this distribution is _________.

9.76

A history professor gives a quiz to his class and records the following scores: 13, 11, 11, 9, 12, 13, 16, 14, 11, 10, 8, 13, 20. The variance for this distribution is _________. Assume sample scores.

10

An industrial psychologist observed 8 drill-press operators for one working day. She recorded the number of times each operator pressed the "faster" button instead of the "stop" button to determine whether the design of the control panel was contributing to the high rate of accidents in the plant. The resulting scores were as follows: 5, 2, 8, 2, 3, 2, 4, 12 The range for this distribution is _________.

All- Measures are-variance,standard deviation, range,sum of squares

Which of the following is not a measure of variability?

all-range, standard deviation, variance, sum of squares

Which of the following is not a measure of variability?

true

With grouped scores, the mode is the mid-point of the interval with the highest frequency.

False

The median is most affected by unbalanced extreme scores.

true

The overall mean is a weighted mean.

funny looking o

Which is the appropriate symbol for the population standard deviation?

all are true

Which of the following is (are) not true?

standard deviation

Which of the following is not a measure of central tendency?

4.75

An industrial psychologist observed 8 drill-press operators for one working day. She recorded the number of times each operator pressed the "faster" button instead of the "stop" button to determine whether the design of the control panel was contributing to the high rate of accidents in the plant. The resulting scores were as follows:5, 2, 8, 2, 3, 2, 4, 12 The mean is

True

By changing the value of one score in a sample this will necessarily cause the mean to change.

False

By changing the value of one score in a sample this will necessarily cause the mode to change.

False

Central tendency and variability are two terms that mean the same thing.

median

Consider the following scores: 21, 22, 22, 0.1, 20, 25, 28, 26, 23, 19, 0.5. Which of the measures listed below would give the best description of the central tendency of these scores?

206

Given the following set of scores X: 10, 12, 6, 8, 9, 11, 13, 13, 5, 0, 1 What is the value of ? S(x-x)^2 Variance (symbolab)

20.6

Given the following set of scores X: 10, 12, 6, 8, 9, 11, 13, 13, 5, 0, 1 What is the variance?

platykurtic

How would you describe a data set that is flatter than a normal curve when graphed? Group of answer choices

Mesokurtic

How would you describe a data set that is looks like a normal curve when graphed? Group of answer choices

the standard deviation will be unchanged

IIf 5 points are added to each score in a distribution, which of the following will happen?

The standard deviation will be unchanged

If 10 points were added to each score in a distribution, which of the following will happen?

True

If a group of 100 people has an average IQ of 107 and a group of 50 people has an average IQ of 101, the average IQ of all the people is 105.

True

If one uses N instead of N - 1 in the denominator of the equation for the sample standard deviation, one will underestimate the population standard deviation.

False

If the distribution contains unbalanced extreme scores, the mean is a better descriptor than the median.

mean

If the distribution is symmetrical, which is the best measure of central tendency?

86.44

In a certain statistics course, four exams were given. Each student's grade was based on a weighted average of his exam scores. The first two tests had weights of 1, the third test had a weight of 2, and the final test had a weight of 3. The exam scores for one student are listed below.

true

In a positively skewed distribution, the mean has a higher value than the median.

true

It is possible to have a set of scores with three different values for central tendency.

true

It is possible to have more than one mode in a sample of scores.

Mean>median

Let's assume that we have determined the salary of all the professors at your school. In plotting the distribution of salaries we notice that it is positively skewed. For this distribution _________.

More

The mean is _______ sensitive to extreme scores than the median.

False

The mean must have a value equal to one of the scores in the distribution.

False

The median is less subject to sampling variation than the mean.