SIA Test UPDATED ACTUAL Exam
Questions and CORRECT Answers
what is statistics (ANSWER)
wha do u do with the data (READ) - collection of methods for planning expeirments, obtaining
data
organizing, sumarizing, presenting, analyzing, interpreting, and drawing conclutions
measure of central tendency
three examples - how close your data is to each other
mean, median, mode
mode - value that occurs most frequently in ur data
what is mode not
what is it - a stable average
the number that comes up the most often
can there be mroe than one modes in a data - yes
median
when theres an odd number...
when theres an even number... - central value that occurs in an ORDERED data
its the center value
its the two center values added up divided by two
what is more of a stable average the median or the mode
what does it not include t - median
range of values above or below it
, mean - AVERAGE
adds up all values and divides by the amount of data
trimmed mean is essentially what
what does it do - how out remove an outlier
removes hihest or lowest value of a group BEFORE taking the mean
what are the usual trim amounts
how do u do it - 5 or 10 percent
Count your data points, multiple that number by the percentage they tell you (5), and then round
up. That number is the number of points you remove from the lower end and the higher end of
the data.
measures of variation - way to descirbe how spread apart the points in the data is
range - difference between largest and smallest values of a distribution
sample standard deviation - average of how each data point differs from the mean (trend line)
how to do population standard deviation - take each of ur x values and line them up vertically
subtract each by the average (mean) of the data
take that number and square it (so they r all positive)
add all those numbers up and divide by the number of data pts
take the square root of that number
how to do standard deviation - take each of ur x values and line them up vertically
subtract each by the average (mean) of the data
take that number and square it (so they r all positive)
Questions and CORRECT Answers
what is statistics (ANSWER)
wha do u do with the data (READ) - collection of methods for planning expeirments, obtaining
data
organizing, sumarizing, presenting, analyzing, interpreting, and drawing conclutions
measure of central tendency
three examples - how close your data is to each other
mean, median, mode
mode - value that occurs most frequently in ur data
what is mode not
what is it - a stable average
the number that comes up the most often
can there be mroe than one modes in a data - yes
median
when theres an odd number...
when theres an even number... - central value that occurs in an ORDERED data
its the center value
its the two center values added up divided by two
what is more of a stable average the median or the mode
what does it not include t - median
range of values above or below it
, mean - AVERAGE
adds up all values and divides by the amount of data
trimmed mean is essentially what
what does it do - how out remove an outlier
removes hihest or lowest value of a group BEFORE taking the mean
what are the usual trim amounts
how do u do it - 5 or 10 percent
Count your data points, multiple that number by the percentage they tell you (5), and then round
up. That number is the number of points you remove from the lower end and the higher end of
the data.
measures of variation - way to descirbe how spread apart the points in the data is
range - difference between largest and smallest values of a distribution
sample standard deviation - average of how each data point differs from the mean (trend line)
how to do population standard deviation - take each of ur x values and line them up vertically
subtract each by the average (mean) of the data
take that number and square it (so they r all positive)
add all those numbers up and divide by the number of data pts
take the square root of that number
how to do standard deviation - take each of ur x values and line them up vertically
subtract each by the average (mean) of the data
take that number and square it (so they r all positive)
