Question

1) What are the differences between a bar graph and a
histogram.

2) A scatter plot describes a graph of bivariate data. If
strong correlation exists between the 2 variables, does that mean
that one causes the other? Explain.

3) A scatter plot describes a graph of bivariate data. If
there's weak correlation exists between the 2 variables, does that
mean that one causes the other? Explain.

Answer #1

**1) The main difference between a bar chart and a
histogram is that, in a bar chart, the labels in the X axis are
categorical; while in histogram, we have the labels as numeric or
quantitative values.**

**This also gives rise to the difference that, in a
histogram, we can talk about the skewness of the data set, but in a
bar chart, talking about the skewness is invalid, because the
labels are purely categorical.**

**2) Even if the data set shows that the two variables
have a very strong correlation, this does not mean that one causes
another; this is because correlation is only a measure of linear
association and does not imply causation.**

**3) Even if the data set shows that the two variables
have a very weak correlation, this does not mean that one causes
another; this is because correlation does not imply
causation.**

For the following data (a) display the data in a scatter plot,
(b) calculate the correlation coefficient r, and (c) make a
conclusion about the type of correlation.
The ages (in years) of
six
children and the number of words in their vocabulary
Choose the correct scatter plot
(b) The correlation coefficient r is
____
(Round to three decimal places as needed.)
(c) Which of the following best describes the type of
correlation that exists between age and vocabulary size?...

For the following data (a) display the data in a scatter plot,
(b) calculate the correlation coefficient r, and (c) make a
conclusion about the type of correlation.
The ages (in years) of
six
children and the number of words in their vocabulary
Age, x
Vocabulary size, y
1
300
2
700
3
1000
4
1450
5
2100
6
2400
make a scatter plot based on this
(b) The correlation coefficient r is
____?
(Round to three decimal places as...

Data Set A- 7,7,7,9,9,9,10
Data Set B- 4,6,6,6,8,9,9,9,10,10,10
Step 1
Create a bar graph that examines a variable or variables in
your data set.
Step 2
Find the sample mean, median (if it exists) mode for each set
of data
Next find the sample standard deviations for each set of
data
Create a box and whisker plot for each variable for each set
data
Eliminate any outliers from the samples. Redo part 1 for each
variable (if necessary, if not...

The scatter plot of megachiropera bats in the Hosken(1998) study
of testes mass and sperm competition showed a strong correlation
between the variables Testis size and social group size. However
that scatter plot data points needed to be independent of each
other for the correlations to have meaning. for example testes size
might be an ancestral character rather than an adaptation to group
size. what is the name of the method Hosken(1998) use to illustrate
independent? give a short description...

1) Construct the scatter plot for the following. From the plot
does there appear to be a linear correlation?
x
2
-4
-2
-1
-2
-1
-4
6
-5
-2
y
-1
-7
2
-7
4
-2
-5
4
-4
-5
2) Find the value of the linear correlation coefficient.
3) Perform a hypothesis test on the claim that there is a linear
correlation. Does there appear to be a linear correlation? Why or
why not?

Does correlation mean the same thing as causation? In other
words, if there exists a strong correlation between two variables,
does that necessarily mean that one variable causes the other?
Support your answer with examples.

Suppose the correlation coefficient between two variables is
found to be 0.83. Which of the following statements are true?
small values of one variable are associated with large values of
the other variable
the relationship between the variables is weak
a scatter plot of the points would show an upward trend
low values of one variable tend to be paired with low values of
the other variable
there is a strong positive curvilinear relationship between the
variables
there is a...

1. Name two ways in which two variables could be related. Select
the two most correct answers. Choose the correct answer below.
A) Strong and moderate B) Moderate and negative C) Weak and
moderate D) strong and weak
2. Name a graph that can be used to quickly illustrate the
relationship between two variables? Choose the correct answer
below.
A) Histogram B) Regression line C) Scatter plot D) Time series
graph.
3. What do we mean by the strength of...

Please create me a scatter plot graph in excel that shows the
difference between the two lengths with appropriate labeling.
Please include step by step instructions on how you create this
graph.
No. of Measurement
Rod Length using
half meter stick (m)
Rod Length using the
motion detector
mean value (m)
1
0.607
0.6542
2
0.605
0.6539
3
0.611
0.6534
4
0.608
0.6528
5
0.606
0.6529
Average
0.6074
0.6534
Std. Dev
0.00192
0.0029

1) How would one determine if an outlier in a scatter plot is an
influential point?
2) What does it mean if the coefficient of determination is
83.5%?
3) Describe how the relationship between x and y changes as
r2 goes from 0 to 1.

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