Basic Statistics

Question 1

What is the mode of this distribution?

1 2 2 2 2 2 4 5 5 7 8 9 10 10 22

Answer 1

2

Question 2

In a standard normal distribution, about ____% of the scores fall above the %-score of 3.00

Answer 2

0.13

Question 3

The percentile rank of the median is

Answer 3

50th

Question 4

The “arithmetic average” is another term for the

Answer 4

mean

Question 5

If the mean is 3 and the standard deviation is 1, the z-score associated with a raw score of 4.5 is

Answer 5

1.50

Question 6

The sum of the difference of scores around the mean is:

1
0
-1
The range
The standard deviation

Answer 6

0

Question 7

The descriptive statistic that estimates the typical distance of any score from the mean is

Answer 7

standard deviation

Question 8

If the correlation between income and charitable giving is 0.82, the relationship between income and donations to charities is

weak and positive
strong and positive
moderate and positive
There is no relationship between income level and donations to charity
weak and negative

Answer 8

Strong and positive

Question 9

A distribution with a shape that is symmetrical around the mean with a “bell” shape is described as

True
Skewed
Normal
Polygonal
Clustered

Answer 9

Normal

Question 10

“Mental illnesses”, “ethnic background” and “political affiliation” are examples of ______________ data.

ratio
nominal
quantitive
ordinal

Answer 10

nominal

Question 11

Measures of central tendency include:

Answer 11

mean, median, and mode

Question 12

The most frequently occurring score in a distribution is called the:

Answer 12

Mode

Question 13

The middle score in a distribution is called the:

Answer 13

Median

Question 14

The average of a distribution of scores is called the:

Answer 14

Mean

Question 15

A few atypical scores can distort what measure of central tendency?

Answer 15

Mean

Question 16

Correlation measures:

the z score

the range in a set of data

the degree of relationship between two sets of data

the standard deviation

Answer 16

The degree of relationship between two sets of data

Question 17

Standard deviation is:

Answer 17

how much scores are different from one another

Question 18

Which is an example of a negative correlation?

People who exercise more have better health

People who get more sleep have higher grades

People who suffer from low self esteem have a higher rate of depression

People who smoke more have a higher rate of cancer

Answer 18

People who suffer from low self esteem have a higher rate of depression

Question 19

Which of the following is an example of random sampling?

Surveying the students in AP Calculus class

Asking anyone who was interested to participate

Approaching 50 students in the hall before school

Picking every 10th name from a list of all students

Answer 19

Picking every 10th name from a list of all students

Question 20

Illusory correlation is:

Answer 20

a perceived correlation that doesn’t really exist

Question 21

Inferential statistics are used to:

Answer 21

generalize from relatively small samples

Question 22

One problem with the mean is that it is ___________________.

Answer 22

sensitive to extremely high or low scores.

Question 23

What type of statistics are used to summarize large amounts of data?

ordinal

inferential

descriptive

nominal

Answer 23

Descriptive

Question 24

True or False.

A simple number that describes a “middle” score is a measure of central tendency.

Answer 24

True

Question 25

True or False.

In order to convert a number to a z-score, it is necessary to know the mean and the standard deviation of a group of scores.

Answer 25

True