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English 12 Public

A review of scatter plots, lines of best fit, and the empirical rule

Study Slideshow

Name the correlation in the image

Positive Correlation

The scatter plot shows the relationship between the number of chapters and the total number of pages for several books. Use the trend line to predict how many chapters would be in a book with 140 pages

14 chapters

How many male math teachers were there in 2006?

Name the correlation in the image

No correlation

Find the correlation coefficient for the scatterplot of the given data. Interpret the result.

r=0.8986. There is a strong positive correlation

Find the correlation coefficient for the scatterplot of the given data. Interpret the result.

r=-0.8433, a strong negative correlation

Find the equation for the line of best fit for the given data. (+5 points: If x represents a person's age and y represents how much they spent on online purchases in a month, interpret the slope)

y=2.75x+109.14, every year you age you spend about 2.75 dollars more per month.

Find the equation for the line of best fit for the given data.

y=-7.26x+73.87

The lifespans of lions in a particular zoo are normally distributed. The average lion lives 10 years; the standard deviation is 1.4 years. Using the empirical rule, find the percentage of lions living between 8.6 and 11.4 years.

68%

A large sample of patients had their systolic blood pressure measured. The mean blood pressure was 125 mm of mercury and the standard deviation was 10 mm. Find percentage of patients whose blood pressure being between 115 and 145

81.5%

The heights of 213 students is normally distributed with a mean of 170 cm and a standard deviation of 8 cm. Approximately how many students would be between 170 cm and 178 cm?

About 72 students

A bottle filling machine fills 20,000 bottles a day with a standard deviation of 2000. If the machine is studied for 260 days, approximately how many of those days are under 18,000 bottles are filled?

About 41 days