RESS

Question 1

What are the two types of categorical data?

Answer 1

Nominal - no natural order (e.g. sex)

Ordinal - categories have an order (e.g. mild, moderate, severe pain)

Question 2

What are the two types of numerical data?

Answer 2

Discrete - whole number

Continuous - no limitations

Question 3

In a histogram what does the area of the bar represent?

Answer 3

Proportional to frequency

Question 4

Are there gaps between bars in histograms?

Answer 4

No

Question 5

are there gaps between bars in bar graphs

Answer 5

yes

Question 6

What is standard deviation?

Answer 6

average distance of a value from the mean

Question 7

In a box plot, what does the middle line show?

Answer 7

median

Question 8

in a box plot, what do the two outside lines show?

Answer 8

Q1 and Q3 of the interquartile range

Question 9

What is standard error of mean and what is it used to calculate?

Answer 9

measure of the precision of the estimated mean

confidence intervals

Question 10

what is degrees of freedom?

Answer 10

n-1

Question 11

How much of all sample means will fall between the sample mean value +/- 2xSEM?

Answer 11

95%

Question 12

What is a 95% confidence interval?

Answer 12

Represents the spread of values that we expect would include the mean 95% of the time if the measurements are repeated, so at a p value of <5% we would expect to observe this estimate of the mean fewer than 5 times every 100