UNIT 2

Question 1

used to describe basic features of the data in the study and provide simple summaries about the sample and measures

Answer 1

Descriptive Statistics

Question 2

describe and understand the features of a specific data set and to repurpose hard-to-understand quantitative insights across a large data set

Answer 2

Descriptive Statistics

Question 3

Two Types of Variables

Answer 3

1. Categorical Variables - qualitative, has distinct groups and variables
2. Continuous Variables - quantitative, represent measurable amounts

Question 4

number of times a particular value occurs in the data

Answer 4

Measure of Frequency

Question 5

can be expressed in ratio, rates, proportions and percentages

Answer 5

Relative Frequencies

Question 6

single values that attempts to describe a set of data by identifying their central position within hat set of data

Answer 6

Measures of Central Tendency

Question 7

arithmetic average or the sum of values in a data set divided by the total number of observations

Answer 7

Mean

Question 8

middle distribution when the data are ranked in order from lowest to highest

Answer 8

Median

Question 9

most common value in a data set

Answer 9

Mode

Question 10

describes the degree to which a variable are similar or diverse

Answer 10

Measures of Dispersion

Question 11

difference between the lowest and the highest value in a set of values

Answer 11

Range

Question 12

measures of spread that reveal how close each observed value is to the mean of the entire data set

Answer 12

Variance and Standard Deviation

Question 13

T/F All descriptive statistics are wither measures of central tendency or measures of variability

Answer 13

True

Question 14

Two Types of Modes

Answer 14

1. Bimodal - distribution has two modes
2. Multimodal - distribution has more than two modes

Question 15

another name for the 50th percentile

Answer 15

Median

Question 16

often used when the distribution of scores is either positively or negatively skewed

Answer 16

Median

Question 17

used when data are interval or ratio scaled and data are not skewed

Answer 17

Mean

Question 18

Morse Type. In symmetrical distributions, the median and mean are equal. For normal distributions, mean = median = mode.

Answer 18

Both T

Question 19

Morse Type. In positively skewed distributions, the mean is smaller than the median. In negatively skewed distributions, the mean is larger than the median.

Answer 19

Both F

Question 19

also known as measures of dispersion

Answer 19

Measures of Variability

Question 20

T/F The more spread out a distribution is, the larger the measure of dispersion is.

Answer 20

True

Question 21

Three common measures of variability

Answer 21

1. The range
2. Semi-interquartile range (SIR)
3. Variance / Standard Deviation

Question 21

Three common measures of variability

Answer 21

1. The range
2. Semi-interquartile range (SIR)
3. Variance / Standard Deviation

Question 22

Difference of the first and third quartiles divided by two

Answer 22

The Semi-Interquartile Range

Question 23

T/F The larger the variance is, the less the scores deviate, on average, away from the mean.

Answer 23

False

Question 24

degree of asymmetry or irregularity of a distribution

Answer 24

Skewness

Question 25

Three Types of Kurtosis

Answer 25

1. Leptokurtic - highest curve
2. Mesokurtic - middle curve
3. Platykurtic - lowest curve