BAP lab 3 - statistics workshop

Question 1

what is parametric data ?

Answer 1

parametric data is normally distributed data which follows a symmetrical bell shape

Question 2

what is non parametric data ?

Answer 2

non parametric data does not follow a normal curve. it may take many different forms: uniform or skewed and others

Question 3

what is descriptive statistics?

Answer 3

statistical process or tools used to calculate values from datasets that describe the shape of the dataset distribution plot

Question 4

what is interferential statistics?

Answer 4

statistical process used to calculate values that represent a comparison between 2 or more sets of data

Question 5

what is the mean ?

Answer 5

the centre and most prevalent value in a parametric dataset.

Question 6

what is standard deviation?

Answer 6

standard deviation is a value that represents the spread/width (technically the variation or dispersion) in a parametric dataset. 68% of the datapoints in a normal distribution will be within the boundaries of the standard deviation

Question 7

what are confidence intervals?

Answer 7

Confidence intervals: are values represents the spread/width in a dataset (can be used for parametric and non-parametric datasets). For parametric datasets the 90% CI is 1.64 x SD, and the 95% CI is 2 x SD. Confidence intervals can be determined for non-parametric distributions but its more complicated to calculate

Question 8

what is central limit theorem

Answer 8

iwhen a process that is being measured has lots of components, then even of the individual components are non-parametric, the final output of the process with give measurements/values that are normally distributed

Question 9

what is median

Answer 9

the central value in a non-parametric dataset, so that, if sorted in numerical order) half the datapoints would be below the value and half above.

Question 10

what is the mode ?

Answer 10

the most prevalent value in a non-parametric dataset

Question 11

what are quartiles?

Answer 11

Quartiles are values that represents the spread/width (technically the variation or dispersion) in a non-parametric dataset. If the dataset was sorted in numerical order, 25% of the values would be below Q1 and 75% below Q3.

Question 12

what is null hypothesis ?

Answer 12

a hypothesis for interferential statistical tests where the hypothesis is that there is no difference between the groups being compared. The P-value (see below) is the probability of the null hypothesis being true

Question 13

what is the P-value?

Answer 13

a numerical value which is the probability of a statement (for example the null hypothesis) being true

Question 14

what is Shapiro-wilk test ?

Answer 14

a test that give a probability (P value) of a dataset being normally distributed

Question 15

what is student t-test

Answer 15

a tool for comparing (inferential statistics) of two parametric datasets (comes in different forms)

Question 16

what is amen Whitney U test

Answer 16

a tool for comparing (inferential statistics) of two non-parametric datasets

Question 17

what test are in parametric vs non parametric?

Answer 17

parametric - mean, standard deviation,

non aparemtric - central limit theorem, median, mode, quartiles, Whitney u test

both - confidence intervals