Deck 14: Descriptive

Question 1

What are statistics used for?

A) To organize data
B) To describe data
C) To make inferences from data
D) All of the above

Answer 1

All of the above

Question 2

What is the least appropriate option to represent nominal and ordinal data?

A) Pie charts
B) Histograms
C) Bar charts

Answer 2

Histograms

Question 3

How does a bar chart represent data?

A) Variables are on the horizontal axis
B) Bars are connected (unless there is a gap in values)
C) Quantities of the variables are on the vertical axis
D) A and C
E) All of the above

Answer 3

A and C

Question 4

Which of the following graph/s is/are used to show continuous data?

A) Pie charts
B) Bar charts
C) Histograms
D) All of them

Question 5

Your study is about male and female students' participation in class. What type/s of graph is/are least appropriate to visually represent your data?

A) Bar charts
B) Pie charts
C) Histograms
D) All work equally well

Question 6

What is the most frequently occurring measurement in the data called?

A) The mode
B) The median
C) The mean
D) None of the above

Question 7

How many modes does a sample need to have to be considered "flat"?

A) Two
B) Three
C) Four
D) A sample can have as many modes as possible

Question 8

What is the midpoint of a distribution (with 50% of the scores above and 50% below) called?

A) The mode
B) The median
C) The mean
D) The range

Question 9

What does this formulate calculate? $$\bar { X } = \frac { \sum X } { n }$$

A) The mode
B) The median
C) The mean
D) None of the above

Question 10

In the previous formula, what does " $\beta$ " stand for?

A) The mean
B) The variable
C) The number of cases
D) The symbol to add up the values of your variable

Question 11

What aspect of the data does "variability" describe?

A) How representative the data is
B) How dispersed the data is
C) How large the data is

Question 12

How do you find the range?

A) By subtracting every x score from the mean
B) By calculating the square root of the variance
C) By subtracting the lowest score from the highest score in a distribution

Question 13

Which of the following is NOT a type of variability?

A) The range
B) The median
C) The variance
D) The standard deviation

Question 14

Which of the following aspects are key characteristics of a distribution?

A) Symmetry
B) Modality
C) Skew
D) All of the above

Question 15

A distribution that has an identical mean, median and mode in a bell curve is :

A) Asymmetrical
B) Symmetrical
C) Impossible to achieve

Question 16

What does "kurtosis" measure?

A) Whether the data is skewed
B) Whether the data is symmetrical or asymmetrical
C) How peaked the distribution is
D) None of the above

Question 17

Your distribution is bimodal, what is it likely to mean regarding your data?

A) You have more than two peaks in your distribution
B) You have two separate kinds of scores in your distribution
C) Your sample has two modes
D) A and C
E) All of the above

Question 18

What are the characteristics of a distribution with high kurtosis?

A) It does not have a lot of variance
B) Each score is happening with almost the same amount of frequency
C) A and B
D) All of the above

Question 19

What are the three main kinds of variability? Explain what each of them measures.

Question 20

What are measures of central tendency used for?

Question 21

When should you use the mode to report the data?

Question 22

Explain what a "skewed data" is and how it can affect statistical testing.

Question 23

In which cases is it better to use the median over the mean?

Question 24

The mean and standard deviation are the most often used descriptive statistics. Explain what each of them measures and why they are important.

Question 25

Present the different ways to describe a distribution and explain what each of them measures.