503 - FINAL EXAM: DESCRIPTIVE &
INFERENTIAL STATISTICS, ALPHA
LEVEL, P-VALUE, CONFIDENCE
INTERVALS, DIAGNOSTIC TESTS,
THREATS TO VALIDITY EXAM 100%
ACCURATE LATEST UPDATED
Population - ANSWERcollection of all individuals or items under consideration
- who we want to test
Sample - ANSWERpart of the population that we collect information from
- who we actually test
Parameter - ANSWERrepresents true measure of population of interest
- Parameter = Population
Statistic - ANSWERrepresents measure calculated from sample
- Statistic = Sample
Collect information on height on 7 students in the class of 38 and calculate the mean.
Does this represent parameter or statistic? - ANSWERStatistic because you are only
looking at a sample of the population
Collect information on height of all 38 students in the class and calculate the mean.
Does this represent parameter or statistic? - ANSWERParameter because you are
looking at entire population
What are the three things you need to know for Descriptive Statistics? - ANSWER-
distribution
- measure of central tendency
- variability
Distribution - ANSWERsummary of frequency of individual values or ranges of values
for a variable
Measure of central tendency - ANSWERcentral point around which some of the data
tend to cluster
, - mean, median, mode
Variability - ANSWERhow far away from the central point all the data lies
How to view distribution of data? - ANSWER- number
- percentage
- frequency = bar graph, pie chart, histogram, line plot
What is the best measure of central tendency to use for nominal data? - ANSWERmode
What is the best measure of central tendency to use for ordinal data? -
ANSWERmedian
What is the best measure of central tendency to use for interval/ratio skewed data? -
ANSWERmedian
What is the best measure of central tendency to use for interval/ratio unskewed data? -
ANSWERmean
Measures of Variability - ANSWER- range
- interquartile/interpercentile range
- standard deviation
Interquartile range (IQR) - ANSWERQ3 - Q1
- the middle 50% of the data
First quartile (Q1) or lower quartile - ANSWER25th percentile
Second quartile (Q2) or median - ANSWER50th percentile
Third quartile (Q3) or upper quartile - ANSWER75th percentile
Standard deviation - ANSWERa measure of variability that describes an average
distance of every score from the mean
What percent of data falls within 1 standard deviation of the mean? - ANSWER68%
What percent of data falls within 2 standard deviation of the mean? - ANSWER95%
What percent of data falls within 3 standard deviation of the mean? - ANSWER99.7%
Standard error of measurement - ANSWERhow much measurement varies from original
value each time measurement is repeated
Standard error of mean - ANSWERassessment of variation in errors that occur when
repeated samples of population are dawn
INFERENTIAL STATISTICS, ALPHA
LEVEL, P-VALUE, CONFIDENCE
INTERVALS, DIAGNOSTIC TESTS,
THREATS TO VALIDITY EXAM 100%
ACCURATE LATEST UPDATED
Population - ANSWERcollection of all individuals or items under consideration
- who we want to test
Sample - ANSWERpart of the population that we collect information from
- who we actually test
Parameter - ANSWERrepresents true measure of population of interest
- Parameter = Population
Statistic - ANSWERrepresents measure calculated from sample
- Statistic = Sample
Collect information on height on 7 students in the class of 38 and calculate the mean.
Does this represent parameter or statistic? - ANSWERStatistic because you are only
looking at a sample of the population
Collect information on height of all 38 students in the class and calculate the mean.
Does this represent parameter or statistic? - ANSWERParameter because you are
looking at entire population
What are the three things you need to know for Descriptive Statistics? - ANSWER-
distribution
- measure of central tendency
- variability
Distribution - ANSWERsummary of frequency of individual values or ranges of values
for a variable
Measure of central tendency - ANSWERcentral point around which some of the data
tend to cluster
, - mean, median, mode
Variability - ANSWERhow far away from the central point all the data lies
How to view distribution of data? - ANSWER- number
- percentage
- frequency = bar graph, pie chart, histogram, line plot
What is the best measure of central tendency to use for nominal data? - ANSWERmode
What is the best measure of central tendency to use for ordinal data? -
ANSWERmedian
What is the best measure of central tendency to use for interval/ratio skewed data? -
ANSWERmedian
What is the best measure of central tendency to use for interval/ratio unskewed data? -
ANSWERmean
Measures of Variability - ANSWER- range
- interquartile/interpercentile range
- standard deviation
Interquartile range (IQR) - ANSWERQ3 - Q1
- the middle 50% of the data
First quartile (Q1) or lower quartile - ANSWER25th percentile
Second quartile (Q2) or median - ANSWER50th percentile
Third quartile (Q3) or upper quartile - ANSWER75th percentile
Standard deviation - ANSWERa measure of variability that describes an average
distance of every score from the mean
What percent of data falls within 1 standard deviation of the mean? - ANSWER68%
What percent of data falls within 2 standard deviation of the mean? - ANSWER95%
What percent of data falls within 3 standard deviation of the mean? - ANSWER99.7%
Standard error of measurement - ANSWERhow much measurement varies from original
value each time measurement is repeated
Standard error of mean - ANSWERassessment of variation in errors that occur when
repeated samples of population are dawn
