Basic Statistics Flashcards
What is the mode of this distribution?
1 2 2 2 2 2 4 5 5 7 8 9 10 10 22
2
In a standard normal distribution, about ____% of the scores fall above the %-score of 3.00
0.13
The percentile rank of the median is
50th
The “arithmetic average” is another term for the
mean
If the mean is 3 and the standard deviation is 1, the z-score associated with a raw score of 4.5 is
1.50
The sum of the difference of scores around the mean is:
1
0
-1
The range
The standard deviation
0
The descriptive statistic that estimates the typical distance of any score from the mean is
standard deviation
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
Strong and positive
A distribution with a shape that is symmetrical around the mean with a “bell” shape is described as
True
Skewed
Normal
Polygonal
Clustered
Normal
“Mental illnesses”, “ethnic background” and “political affiliation” are examples of ______________ data.
ratio
nominal
quantitive
ordinal
nominal
Measures of central tendency include:
mean, median, and mode
The most frequently occurring score in a distribution is called the:
Mode
The middle score in a distribution is called the:
Median
The average of a distribution of scores is called the:
Mean
A few atypical scores can distort what measure of central tendency?
Mean
Correlation measures:
the z score
the range in a set of data
the degree of relationship between two sets of data
the standard deviation
The degree of relationship between two sets of data
Standard deviation is:
how much scores are different from one another
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
People who suffer from low self esteem have a higher rate of depression
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
Picking every 10th name from a list of all students
Illusory correlation is:
a perceived correlation that doesn’t really exist
Inferential statistics are used to:
generalize from relatively small samples
One problem with the mean is that it is ___________________.
sensitive to extremely high or low scores.
What type of statistics are used to summarize large amounts of data?
ordinal
inferential
descriptive
nominal
Descriptive
True or False.
A simple number that describes a “middle” score is a measure of central tendency.
True
