### Negatively Skewed Distribution, Population, Frequency Distribution Graph, Distribution

The key terms used in these Statistic chapters include Negatively Skewed Distribution & Positively Skewed Distribution, Frequency Distribution Graph, Distribution, Population & Sample The Statistic Exam is based on these chapters.

In a population of N = 10 scores, the smallest score is X = 8 and the largest score is X = 20. The range for the population is ____. (the data are discrete; and there is no need to use real limits)**12**

In a positively skewed distribution, the scores pile up on the left side of the distribution and taper off to the right.

**True**

A histogram is constructed so that adjacent bars touch.

**True**

If a set of exam scores forms a symmetrical distribution, what can you likely conclude about the students’ scores?

**About 50% of the students had high scores and rest had low scores**

After recording the final grade (A, B, C, D, F) for each individual in a class of N = 26 students, the professor would like to display the grade distribution in a frequency distribution graph. What kind of graph should be used?

**A bar graph**

What is the total number of scores for the distribution shown in the following table?

X f

4 3

3 5

2 4

1 2

**14**

In a population with a mean of μ = 50, a score of X = 45 would have a deviation score of ____.

**-5**

A population of N = 10 scores has μ = 50 and σ = 5. What is the population variance?

**25**

In a population of N = 10 scores, the smallest score is X = 8 and the largest score is X = 20. The range for the population is ____. (the data are discrete; and there is no need to use real limits)**12**

In a positively skewed distribution, the scores pile up on the left side of the distribution and taper off to the right.

**True**

A histogram is constructed so that adjacent bars touch.

**True**

If a set of exam scores forms a symmetrical distribution, what can you likely conclude about the students’ scores?

**About 50% of the students had high scores and rest had low scores**

After recording the final grade (A, B, C, D, F) for each individual in a class of N = 26 students, the professor would like to display the grade distribution in a frequency distribution graph. What kind of graph should be used?

**A bar graph**

What is the total number of scores for the distribution shown in the following table?

X f

4 3

3 5

2 4

1 2

**14**

A sample of n = 5 scores has M = 20 and s2 = 4. What is the sample standard deviation?

**2**

For the following distribution of quiz scores, if a score of X = 3 or higher is needed for a passing grade, how many individuals failed the quiz?

X f

5 6

4 5

3 5

2 3

1 2

**16**

On average, what value is expected for the t statistic when the null hypothesis is true?

**0**

A sample of n=25 scores has M=20 and s^2=9. What is the sample standard deviation?**3**

A sample of n=6 scores has a standard deviation of s=3. What is the value of SS, the sum of squared deviations for this sample?**45**

For the following distribution, what percentage of the individuals have scores of X = 1?

X f

5 2

4 8

3 5

2 3

1 2

**= 10%**

If a set of exam scores forms a negatively skewed distribution, what can you likely conclude about the students’ scores?

**Most of the students had relatively high scores**

For the scores in the following table, what is the value of ΣX2?

X f

4 1

3 2

2 1

1 3

In a frequency distribution graph, frequencies are presented on the _______ , and the scores (categories) are listed on the ________

**Y axis, Scores X axis**

A population of N = 10 scores has μ = 50 and σ = 5. What is the population variance?

**25**

A sample of n = 5 scores has M = 20 and s2 = 4. What is the sample standard deviation?

**2**

For any set of data, the sum of the deviation scores (that is, deviations from the mean) will always be ___.

**Equal to zero**