Scatter Plots Homework

Transcription

1 Scatter Plots Homework 1. A dentist kept a record of the number of new cavities his patients had per year for the last 10 years. The scatter plot below shows the average number of new cavities per year for patients in the 4- to 32-year age range. Which description best represents the relationship of the dentist s data? A. Negative trend C. Positive trend B. No trend D. Cannot determine trend 2. For a class presentation, Reggie dropped a rubber ball from different heights and recorded the number of bounces made by the ball before it came to rest. The data are displayed in the scatter plot below. Based on the data in the scatter plot, predict the number of bounces that the ball will make if Reggie drops it from a height of 10 feet. A. Between 27 and 30 C. Between 34 and 39 B. Between 30 and 34 D. Between 39 and 45

2 3. The scatter plot below shows the cost of phone calls Betsy made to her brother overseas in relation to the number of minutes per phone call. Based on the information in the scatter plot, which statement is a valid conclusion? A. As Betsy made more phone calls, the cost of the phone call increased. B. As Betsy made fewer phone calls, the cost of the phone calls decreased. C. As Betsy decreased the number of minutes on the phone, the number of phone calls decreased. D. As Betsy increased the number of minutes on the phone, the cost of the phone calls increase. 4. The scatter plot below shows the number of households with cable television service during certain years. Which statement best describes the relationship of the scatter plot? A. The number of households with cable service increased over time. B. The number of households with cable service decreased over time. C. The number of households with cable service remained the same over time. D. The number of households with cable service could not be determined over time.

3 5. A colony of bacteria was exposed to a chemical for 7 consecutive days. An approximate count of the number of bacteria was recorded at the same time each day. The graph shows the data that were recorded. Which of the following is a correct conclusion based on the graph above? A. The bacteria continued to increase in number during the seven days. B. The bacteria count was on day 2. C. The bacteria count was greatest on day 5. D. The bacteria count began to decrease after day 4. 6 The scatterplot below shows the amount of time a piano student spends practicing a song and the number of incorrect notes he plays while performing that song. 10 Piano Practice Number of Incorrect Notes Played Time Spent Practicing (hours) Which statement best describes the relationship shown in the scatterplot? A As the time spent practicing increases, the number of incorrect notes played remains constant. B The greater the time spent practicing, the fewer the number of incorrect notes played. C There is no relationship between the time spent practicing and the number of incorrect notes played. D The greater the time spent practicing, the greater the number of incorrect notes played.

4 People in Attendance Number of Calories 7. The scatter plot shows the number of calories and grams of fat per serving in some common foods. The line of best fit for the data is also shown. Which one of the following statement is true? Grams of Fat Grams of Fat A. There does not appear to be any relationship between the calories and grams of fat. B. As the grams of fat increase, the number of calories increases. C. As the grams of fat increase, the number of calories decreases. D. The number of calories is approximately 25 times the grams of fat. 8. The scatterplot below shows movie theaters with different numbers of screens and their average weekly attendance. y Movie Attendance Number of Screens x Based on the trend in the scatterplot, approximately how many people will be in attendance at a movie theater with 8 screens? A 80 C 60 B 105 D 140

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