Denton Independent School District / Overview



STAAR Practice Test #3Name:________________________TEKS 4 and 12 (Correlation Coefficient) Block:_________ Date:__________494792092075001. (4B) The scatterplot shows the number of visitors to a beach each day and the high temperature in degrees Fahrenheit for that day. Based on this scatterplot, which statement appears to be true?A There is a nonlinear correlation between the high temperature and the number of visitors to the beach.B When the high temperature is above 100°F, fewer than 150 visitors are expected at the beach.C There is no correlation between the high temperature and the number of visitors to the beach.D When the high temperature is between 75°F and 90°F, more than 120 visitors are expected at the beach.2. (12D) The first five figures in a pattern are shown below. Each figure is made up of identical circles. If the pattern continues, which expression can be used to find the number of circles that make up Figure n?-3048032146400A. n2+2n B. n2+2 C. 2n2+1 D. 2n2+n3. (12B) A city employee paints curbs in parking lots and replaces road signs. It takes 0.5 hour to paint a parking lot curb and 2.5 hours to replace a road sign. The function below can be used to find c, the number of parking lot curbs the employee paints when he replaces r road signs in a 40-hour workweek. 12035176264900If the employee painted 20 curbs in one week, how many road signs did he replace that week?F 20 G 30 H 0 J 124. (12B) The function L=0.8T2 models the relationship between L, the length in feet of a pendulum, and T, the period in seconds of the pendulum. Which value is closest to the period in seconds for a pendulum that is 30 ft long?F 5.4 G 4.9 H 6.8 J 6.1 5. (12B) If fx=x-32+4 andg(x) = x3+2, which statement is true?F f(?2) = g(?3) G f(0) = g(?1) H f(8) = g(3) J f(2) = g(1) 538627643815006. (12A) Which representation does not show y as a function of x?41448681479550014210314891600188207199695007. (12C) Write the first 4 terms of the sequence defined by the recursive rule: f(1) = 6 , f(n) = f(n ? 1) + 8 , for each whole number n greater than 1.8. (12E) For altitudes up to 36,000 feet, the relationship between ground temperature and atmospheric temperature can be described by the formula t=-0.0035a + g, in which t is the atmospheric temperature in degrees Fahrenheit, a is the altitude, in feet, at which the atmospheric temperature is measured, and g is the ground temperature in degrees Fahrenheit. Determine the altitude in feet when t is -27.5 degrees and g is 60 degrees .9. (12A) The mapping below represents y as a quadratic function of x. Which representation shows the same relationship between x and y?91172242545001794510101600098425981506008511581000 62865768690010. (12D) Find the indicated term of the given sequence. 1, 8, 64, …; 7th term11. (12D) Find the indicated term of the given sequence. 3, -12, 48, …; 7th term12. (12D) Find the indicated term of the given sequence. –2, –4, –6, –8, –10, …; 9th term13. (12D) Seats in a concert hall are arranged in the pattern shown. If every seat in the first 12 rows is filled, what is the total revenue from those seats if each seat was $25?156930869902009816585224670014. (12B) The graph of is below. Find the value of when and CIRCLE it on the graph below. 185162359067175387035877515. (12A) Use the vertical line test to determine whether or not each graph below represents function. 16. (12D) In Yellowstone National Park, they are trying to increase the moose population. Currently there are 51 moose in the park. They hope to increase the population by 2 moose each year. Predict the population on the 42nd year. 17. (12B) During the cold winter months the owner at a ski resort studied the monthly sales figures for his hot chocolate sales and notices a positive correlation to the number of broken legs from falls!. He is horrified! He decides to immediately close down his ski resort. Do you agree with his decision?18. (12D) Tai wrote the sequence -2, 5, 12, 19 . . . . . What is the function rule? fn=7n-7 fn=7n-9 fn=4n-7 fn=4n-919. (4A) Which graph below has a correlation coefficient close to 1?310451588265003790958826500-4953045402520. (4A) Using the data below, estimate the correlation coefficient.0.912 B. -0.997 C. 0.977 D. 1406402895600021. Which of the following are not functions?A. 1, 2, 4, 5 B. 2, 5, 6 C. 3, 4, 6 D. 3, 622. (4B) A group of biologists is studying the population of wolves and the population of deer in a particular region. The biologists compared the populations each month for 2 years. After analyzing the data, the biologists found that as the population of wolves increases, the population of deer decreases. What can be said about this situation?There is no real correlation in this situation.The cause of the increase in the deer population is that the wolves are eating all the deer.There is a correlation between the population of the wolves and the population of deer, but it is uncertain what it is.The decline in the deer population is causing more wolves to be born and increasing their population.23. (4B) The manager of an ice cream shop studies its monthly sales figures and notices a positive correlation between the average air temperature and how much ice cream they sell on any given?day. Which statement below is false?A. The two variables are ice cream sales and average air temperatures.B. It is likely that warmer air temperatures cause an increase in ice cream sales. C. It is doubtful that increased ice cream sales cause an increase in air temperatures.D. There is a weak correlation between the number of ice creams sold and the warmer temperatures.1 D2A3J4J5F6J76, 14, 22,30825,0009D10262,1441112,28812-1813$675014115A1613317No18B19A20B21D22C23DAnswer Key for Test #3 ................
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