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WorksheetsEduc./Inferential Stat. Long Test
Total questions: 75
Worksheet time: 1hrs 19mins
What is the correlation for the following Scatter Plot.
Weak Positive
No Correlation
Strong Negative
Weak Negative
Strong Positive
What is the correlation for the following Scatter Plot.
Weak Positive
No Correlation
Strong Negative
Weak Negative
Strong Positive
Correlation coefficient is the statistic that measures the strength and direction of a linear association between two quantitative variables.
True
False
If r=0, there is a strong correlation.
True
False
r = -0.3 is considered to have...
moderate negative correlation
weak negative correlation
no correlation
strong negative correlation
What is the standard deviation for the data given:
5, 10, 7, 12, 0, 20, 15, 22, 8, 2
6.89
10.1
7.26
9
The median score is also the _____.
75th percentile
5th decile
3rd decile
1st quartile
When a distribution is divided into hundred equal parts, each score point that describes the distribution is called a ___________.
percentile
decile
quartile
median
The lower quartile is equal to ______________.
50th percentile
25th percentile
2nd decile
3rd quartile
Rochelle got a score of 55 which is equivalent to 70th percentile in a mathematics test. Which of the following is NOT true?
She scored above 70% of her classmates.
Thirty percent of the class got scores of 55 and above.
If the passing mark is the first quartile, she passed the test.
Her score is below the 5th decile.
In a 100-item test, the passing mark is the 3rd quartile. What does it imply?
The students should answer at least 75 items correctly to pass the test.
The students should answer at least 50 items correctly to pass the test.
The students should answer at most 75 items correctly to pass the test.
The students should answer at most 50 items correctly to pass the test
In the set of scores: 14, 17, 10, 22, 19, 24, 8, 12, and 19, the median score is _____.
17
16
15
13
In a 70-item test, Melody got a score of 50 which is the third quartile. This means that:
she got the highest score.
her score is higher than 25% of her classmates.
she surpassed 75% of her classmates.
seventy-five percent of the class did not pass the test.
The 1st quartile of the ages of 250 fourth year students is 16 years old. Which of the following statements is true?
Most of the students are below 16 years old.
Seventy-five percent of the students are 16 years old and above.
Twenty-five percent of the students are 16 years old.
One hundred fifty students are younger than 16 years.
Which of these fractiles divides the data set into four equal parts?
Decile
Median
Percentile
Quartile
Which of these percentiles refer to the median?
P10
P25
P50
P75
Which of these percentiles refer to the 1st decile?
P10
P25
P50
P75
What is the upper quartile in the distribution?
80, 85, 86, 90, 93, 95, 96
85
90
95
96
What is the percentile rank of 87?
Given: 70, 75, 80, 86, 87, 91, 94, 95, 98, 98
25th
40th
50th
75th
What percent of the students who took the exam have the lower scores than Jose if Jose's score is at the 95th percentile rank?
75
80
90
95
if Jose's score is at 95th percentile rank, what is the probability that a score randomly chosen is equal to or greater than Jose's score?
5 %
20%
25%
95%
The median is equivalent to ____.
A. the median quartile (Q2)
B. the 5th decile (D5)
C. the 50th percentile (P50)
D. all of these
The distribution is _________ skewed.
positively
negatively
not
normal
How peak or how flat is the curve in the middle distribution refers to the _______.
skewness
kurtosis
bimodal
median
The data in the picture:
is negatively skewed
positively skewed
symmetrical
Remember skew = standard deviation3(mean−median) . Find the skew to 2 decimal places
(a)
Kurtosis is a measure of whether a plot has
Fat or skinny tails
Aesthetic appeal
A non-normal mean
Too many eigenvalues
A has minimal kurtosis
B has normal kurtosis
C has heavy kurtosis. In order ABC, they are:
Platykurtic, mesokurtic and leptokurtic
Leptokurtic, platykurtic and mesokurtic
Mesokurtic, platykurtic, and leptokurtic
Leptokurtic, mesokurtic and platykurtic
It is defined as the square root of the variance.
coefficient of variation
midrange
standard deviation
kurtosis
How peak or how flat is the curve in the middle distribution refers to the _______.
skewness
kurtosis
bimodal
median
If the distribution is symmetric about mean then the skewness is
0
1
positive
negative
Which measure is used to determine whether the distribution is heavy-tailed or light-tailed?
skewness
kurtosis
variance
standard deviation
Refers to the degree of flatness or peakedness of a frequency distribution
Measures of shape
Measures of skewness
Concept of kurtosis
Cumulative distribution
Items are more closely clustered around the mean
Mesokurtic
Leptokurtic
Platykurtic
In a population of five university students with GPAs of 2.5, 2.3, 1.7, 1.4, and 1.1, a sample of three students are considered. What would be the standard deviation of the resulting sampling distribution?
0.53
0.41
0.35
0.22
What does variance represent?
How many different variations are in the data set.
How the population varies compared to the sample.
How spread out each data value is from the mean.
The range, but with a bunch of other stuff going on.
How do you calculate the standard deviation?
Divide the variance by 2.
Its a long process and I can't explain it right now.
Find the mean and multiply it by the variance.
Take the square root of the variance.
36, 42, 28, 52, 48, 36, 31
What is the median number of miles Jenna cycled?
Set 1-Standard Deviation=3.1
Set 2-Standard Deviation=4.9
Set 3-Standard Deviation=1.7
Set 4-Standard Deviation=3.2
Which set of data probably has the points closest to the mean?
What does variance represent?
How many different variations are in the data set.
How the population varies compared to the sample.
How spread out each data value is from the mean.
The range, but with a bunch of other stuff going on.
How do you calculate the standard deviation?
Divide the variance by 2.
Its a long process and I can't explain it right now.
Find the mean and multiply it by the variance.
Take the square root of the variance.
What is the range in statistics?
(Highest + lowest)/2
Highest - lowest
(Highest - lowest)/2
(Highest - lowest)2
Before you can begin calculating the variance, you must first:
find the mean
find the median
find the mode
find the range
What is the difference between the formulas for population variance and sample variance?
The sample variance is the square root of the population variance.
The population variance divides the sum of the squares by n-1, while sample divides by N.
The population variance divides the sum of the squares by N, while sample divides by n-1.
There is no difference.
Order the dot plots from least to greatest standard deviation.
A, D, C, B
B, C, D, A
A, D, B, C
B, C, A, D
Before you can begin calculating the variance, you must first:
find the mean
find the median
find the mode
find the range
What is the difference between the formulas for population variance and sample variance?
The sample variance is the square root of the population variance.
The population variance divides the sum of the squares by n-1, while sample divides by N.
The population variance divides the sum of the squares by N, while sample divides by n-1.
There is no difference.
Find the standard deviation of the following
2, 5, 5, 8, 11, 12
to 3 s.f.
(a)
Find the standard deviation of the following
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2
(a)
1. The median score is also the ______.
75th percentile
5th decile
3rd decile
1st quartile
3. The lower quartile is equal to ______.
50th percentile
2nd decile
25th percentile
3rd quartile
Describe a correlation with a coefficient of r=0.3
Strong positive
Weak positive
Strong negative
Weak negative
What are numbers, pictures or words without context known as?
Data
Information
Knowledge
What are a collection of words, numbers or pictures with meaning known as?
Data
Information
Knowledge
Which of the following is not an item of data?
Numbers
Images
report
raw facts
Statistics solve economic problems
True
False
Statistics is the science of analyzing
Qualitative data
Quantitative data
Both a and b
None of these
_______ is the entire group of objects or individuals considered for a survey.
Population
Sample
Parameter
Scope
Identify whether the experiment involves a discrete or a continuous random variable.
Collecting data about the mileage per liter of a certain brand and model of a car
Discrete Random Variable
Continuous Random Variable
Indicate which level of measurement is being used in the given scenario.
The teacher of a class of third graders records the height of each student.
Nominal
Interval
Ordinal
Ratio
Indicate which level of measurement is being used in the given scenario.
The teacher of a class of third graders records the letter grade for mathematics for each student.
Nominal
Ordinal
Interval
Ratio
