Statistics (1)

Question 1

What is a population?

Answer 1

Entire group of individuals

Question 2

What is a sample?

Answer 2

Represents populations which are too large

Question 3

What is a variable?

Answer 3

Condition which can take on a different value

Question 4

Name 2 types of data

Answer 4

Categorical and Numerical

Question 5

Describe 2 types of categorical data

Answer 5

1. Nominal (no order to values)
2. Ordinal (some sort of order)

Question 6

Describe 2 types of numerical data

Answer 6

1. Discrete (fixed numbers)
2. Continuous (infinitely divisible)

Question 7

Name 3 measurements of central tendency

Answer 7

1. Mean
2. Mode
3. Median

Question 8

Name 3 measurements of dispersion

Answer 8

1. Range
2. IQ range
3. SD

Question 9

What is the mean?

Answer 9

Average

Question 10

What is the mode?

Answer 10

Most frequently occurring value

Question 11

What is the median?

Answer 11

50th percentile value

Question 12

What is range?

Answer 12

Highest to lowest point

Question 13

What is interquartile range?

Answer 13

25th to 75th percentile giving middle 50% of values

Question 14

What is standard deviation?

Answer 14

How close values are scattered around mean

Question 15

What is standard error of the mean?

Answer 15

SD of number of means from different samples of same population

Question 16

Name and describe 4 scales used in statistics (in order from weakest to strongest)

Answer 16

1. Nominal Scale
   Unordered categories set by name (only same or different)
2. Ordinal Scale
   Ordered categories set by name (shows direction of change)
3. Interval Scale
   Equal difference with arbitrary 0 point (e.g temp in C)
4. Ratio Scale
   Interval scale with 0 meaning none of variable present (e.g temp in K)

Question 17

What is the function of confidence intervals?

Answer 17

Way to indicate probability of mean for the population lies within range of values in sample