Negatively Skewed Distribution & Population – Statistic Exam

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Negatively Skewed Distribution & Population - Statistic Exam
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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


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