Statistics Portage CNSL 503 Exam 2
Questions and Answers11
population variance - ANSWERS-the average squared deviations between each score and the
mean
formula for population variance - ANSWERS-σ²= SS/N or σ²= Σ(X-μ)^2/N
sample variance - ANSWERS-the average squared deviations between each score and the mean
formula for sample variance - ANSWERS-s^2 = SS/n-1 or s^2= Σ(X-x̅)^2/n-1
degrees of freedom - ANSWERS-the number of scores in the sample that are independent
df for each sample - ANSWERS-n-1
population standard deviation symbol - ANSWERS-σ
sample standard deviation symbol - ANSWERS-S
populations standard devitation - ANSWERS-the average deviation between each score and the
mean
formula for population standard deviation - ANSWERS-square root[Σ(X-μ)^2/N]
, sample standard deviation - ANSWERS-the average deviation between each score and the mean
formula dor sample standard deviation - ANSWERS-square root[Σ(X-x̅)^2/n-1]
frequency distribution - ANSWERS-presents the frequency of every value in a dataset
frequency tables - ANSWERS-displays the number of times (ex: frequency) a certain value
appears within the dataset in a table format
What does each column represent in frequency tables? - ANSWERS-one column represents the
category, the other column represents the frequency
absolute frequency - ANSWERS-raw count
What type of frequency do you use when answering " how many student out of the total
number of students scored a letter grade?"? - ANSWERS-relative frequency
relative frequency - ANSWERS-the ratio between the absolute frequency of a category and the
total frequency
formula for relative frequency - ANSWERS-frequency in category/total frequency
What type of frequency do you use when answering the question "how many students scored a
B or better?"? - ANSWERS-cumulative frequency
cumulative frequency - ANSWERS-the sum of frequencies of all preceding categories
Questions and Answers11
population variance - ANSWERS-the average squared deviations between each score and the
mean
formula for population variance - ANSWERS-σ²= SS/N or σ²= Σ(X-μ)^2/N
sample variance - ANSWERS-the average squared deviations between each score and the mean
formula for sample variance - ANSWERS-s^2 = SS/n-1 or s^2= Σ(X-x̅)^2/n-1
degrees of freedom - ANSWERS-the number of scores in the sample that are independent
df for each sample - ANSWERS-n-1
population standard deviation symbol - ANSWERS-σ
sample standard deviation symbol - ANSWERS-S
populations standard devitation - ANSWERS-the average deviation between each score and the
mean
formula for population standard deviation - ANSWERS-square root[Σ(X-μ)^2/N]
, sample standard deviation - ANSWERS-the average deviation between each score and the mean
formula dor sample standard deviation - ANSWERS-square root[Σ(X-x̅)^2/n-1]
frequency distribution - ANSWERS-presents the frequency of every value in a dataset
frequency tables - ANSWERS-displays the number of times (ex: frequency) a certain value
appears within the dataset in a table format
What does each column represent in frequency tables? - ANSWERS-one column represents the
category, the other column represents the frequency
absolute frequency - ANSWERS-raw count
What type of frequency do you use when answering " how many student out of the total
number of students scored a letter grade?"? - ANSWERS-relative frequency
relative frequency - ANSWERS-the ratio between the absolute frequency of a category and the
total frequency
formula for relative frequency - ANSWERS-frequency in category/total frequency
What type of frequency do you use when answering the question "how many students scored a
B or better?"? - ANSWERS-cumulative frequency
cumulative frequency - ANSWERS-the sum of frequencies of all preceding categories
