Fichas
MCQ 1 (week 1-4)
Fichas del conjunto (10)
- 1two differences in results1. error variability - chance results, noise
2. meaningful results - 2dealing with error variabilitytry to eliminate it
can NEVER get rid of all error variability
try to report it
try to accounts for it - 3measuring variability1. data points are not all the same
2. they fall in a range/distribution
normal distribution (symmetrical bell curve)
not a normal distribution (skewed, data points are spread out) - 4parametricscores must be normally distributed, continuous and most common
the centre of the range is called the mean - 5two types of variables1. categorical - groups, categories, nominal labels, ordinal labels
2. continuous - numerical measures, scores, no set result - 6test statistictest statistic = observed variability/
error variability - 7z scorethe z score is the number of standard deviations from the mean a data point is
z score = score - mean/
standard deviation - 8z scorewithin distribution - the z score is close to 0 positive or negative
outside distribution - z score is far from 0 positive or negative
if z score is between -1.96 and 1.96 it is significant
if z score is below -1.96 or above 1.96 it is insignificant - 9observed variabilityobserved variability = sample mean -
population mean - 10standard errormeasures how far the sample mean of the data is likely to be from the true population mean
standard error = standard deviation/
√N
Información
- Descripción
- (USING DATA) UNIVERSITY Fichas sobre MCQ 1 (week 1-4), creado por Aamna Khan el 20/02/2019.
- Creado por
- Aamna Khan
- Visitas
- 0
- Valoración