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.
