Exam 6: Scatterplots, association, and Correlation

The paired data below consist of the height (in cm)of children and their reading scores.If the height was recorded in inches,what would be the correlation?

The paired data below consist of the height of children (in cm)and their reading scores.

Determine whether the scatterplot shows little or no association, a negative association, a linear association, a moderately strong association, or a very strong association (multiple associations are possible). -

Owners of a new computer store tracked sales (in thousands)for the first 12 days,and displayed the data in a scatterplot.Make a histogram of the daily sales since the shop has been in business.

Student: grade point average,student: height (feet)

Determine whether the scatterplot shows little or no association, a negative association, a linear association, a moderately strong association, or a very strong association (multiple associations are possible). -

A shop owner tries to predict the winter collection sales by displaying coat sales (in dollars)and the outside temperature (in degrees Fahrenheit)in the following scatterplot.Make a histogram of the coat sales.

Teacher: weekly salary,teacher: years of experience

Data collected from students in Statistics classes included their heights (in inches)and weights (in pounds).For the students' heights and weights,the correlation is 0.653.Suppose the variable weight is recorded in kilograms rather than in pounds.What will be the correlation?

A science instructor assigns a group of students to investigate the linear relationship between the pH of the water of a river and its water's hardness (measured in grains).Some students wrote these conclusions: "My correlation of -0.85 shows that there is almost no association between pH of the water and water's hardness." Is the interpretation of the correlation appropriate?

A shop owner tries to predict heater sales by displaying the sales of hot chocolate and heaters on the following scatterplot.Does the scatterplot of hot chocolate sales and heater sales indicate that it is appropriate to calculate the correlation?

A study was conducted to compare the average time spent in the lab each week versus course grade for computer students.The results are recorded in the table below.

Determine whether the scatterplot shows little or no association, a negative association, a linear association, a moderately strong association, or a very strong association (multiple associations are possible). -

A ceramics factory can fire six large batches of pottery per day.Sometimes in the process a few of the pieces break.In order to understand the problem better,the factory records the number of broken pieces in each batch for 4 days and then creates the scatterplot shown.Make a histogram showing the distribution of the number of broken pieces in the 24 batches of pottery examined.

Several scatterplots are given with calculated correlations. Which is which? - a)-0.993,b)-0.047,c)0.774,d)0.937

Litres remaining in a take of gas,kilometres driving since filling up.

Oranges: circumference (centimetres),oranges: weight (grams)

A study is conducted on the causes of flat feet,and shows a linear relation between age and having mechanical disturbances of the foot.The correlation between these two variables is 0.84.The report concludes that older people have greater chances to have flat feet.Is the calculation of the correlation appropriate?

A study of consumer behavior finds a positive correlation between sales of ice cream and sales of soda.What might explain the strong correlation?

Adult weight (kg):,Adult height (m):