What correlation can be observed between x and y in the figure?
How can the relation between the variables in the given scatter plot be best described?
(a) Weak positive correlation
(b) Strong positive correlation
(c) Correlation approximately 0
(d) Strong negative correlation
Sketch a scatter plot of the data and find out if the data have a positive correlation, a negative correlation, or relatively no correlation.
The table lists the number of population in the state of Arizona from the year 1970 to 1994. Sketch a scatter plot of the data and find out if the data have a positive correlation, a negative correlation, or relatively no correlation.
Draw a scatter plot of the data and estimate the best–fitting line for the data.
Use the information given below to construct a scatter plot. What is the line of best fit?
x
–4
–2.5
–2
–0.5
0
1.5
2
3
4.5
5
y
4
2.5
0.5
–1
–1.5
What would be the equation of a line that fits the given scatter plot the best?
The table below shows the age and systolic blood pressure for a group of people who recently donated blood. Draw the line of best fit for this data.
The table records the price per bushel and how many thousand bushels of wheat were sold at that price during a 10–day selling period in Iowa.
Draw the line of best fit for this data.
The table records the total sales of the products between 1980 and 1993 in the United States.
The table gives per capita (person) revenue and expenditure for selected states from a recent year.
The table below gives the number of households c (in millions), in the US that owned a computer between the years 1985 and 1991.
Draw the best fitting line to this data. If t represents the year, with t = 4 corresponding to year to 1984, find the number of households that would own computers in the year 1995.
The table shows the percent increase in the sale of Ice cream in the US.
Draw the best fitting line to this data. If t represents the year, with t = 6 corresponding to year to 1986, find the number of households that would own computers in the year 1997.
The average life expectancy (in years) of a person based on various years of birth is listed in the following table.
Predict the life expectancy of someone born in the year 2010.
What is the correlation coefficient, r, for:
(–6, 4), (–5, 3), (–3, 1), (–2, –1), (3, –4)?
