Richmond County School System



Algebra 1B- Practice Questions on StatisticsName _________________________Mrs. Harriman was curious about how much total time her Algebra 1 students had spent so far this week doing Khan Academy. She pulled the records of ten random students and recorded the number of hours spent. These are the results: 2, 1, 1, 0, 2, 6, 0, 3, 2, 31. What is the mean number of hours spent by these 10 students?a. 1b. 2c. 3d. 42. What is the mean absolute deviation of the data?a. 0.1b. 0.8c. 1d. 23. Mrs. Pickett calculated the same measures for ten of her students. Her students had a mean absolute deviation of 3 for their data. Which of these must be true?a. Mrs. Pickett’s student data is more spread out because the MAD is higher.b. Mrs. Pickett’s students have been working more time because the MAD is higher.c. Mrs. Pickett’s student data must have contained at least one outlier because of the high MAD value.d. None of these is true.4. What is the five number summary for the data? 2 4 22 6 1 4 1 5 7 4a. Min: 1b. Min: 1c. Min: 1d. Min: 1Q1: 2Q1: 1.5Q1: 2Q1: 1.5Med:4Med:4Med:4Med: 4Q3: 6Q3: 6.5Q3: 6Q3: 6.5Max:7Max:7Max:22Max: 225. The number of calls answered by a paramedic team over an 8-day period are given. Use the data to make a box-and-whisker plot.12, 6, 8, 15, 14, 6, 14, 10a.b.c.d.3371850381000 6. Consider the given histogram. Which of these describes the shape?a. Skewed leftb. Skewed rightc. Roughly symmetricd. None of the above2286005715007. 8. The mean of 7, 4, 3, and x is 6. Which of these could be used to find the value of x?a. 7+4+3+6+x5b. 7+4+3+x4=6c. 7+4+33=6d. 7+4+3+x3=69. Which one of these is least affected by outliers?a. Medianb. Meanc. Ranged. All of these are greatly affected10. Big Frufru (Little Frufru’s grandmother) and some of her friends rode2895600973455motorcycles all day on Saturday. She made a table that showed the number of gallons of gas remaining at the end of each hour. The scatterplot below shows the gas that remained in terms of the hours that had passed. Which of the following describes the correlation between the gas that remained and the hours that had passed?A Positive correlationB negative correlationC No correlationD undefined correlation11. Olive Skule records the ages and weights of 12 children in her neighborhood. Ifshe records this data in a scatterplot, what type of relationship will she most likely see?A Positive correlationc. no correlationB Negative correlationd. multiple correlations12. A carpenter recorded the amount of money he earned for different jobs and the amount of time he spent on each job. The data are shown in the scatterplot below. What would be a reasonable estimate of a correlation coefficient for the scatter plot?a. r = 0.97b. r = -0.89c. r = -0.42d. r = 0.6313. Which equation best models the data in the scatter plot?14. After hosting a bake sale, the Bakers Club at DFA analyzed their data and found that their sales could be modeled by a linear equation. The line of best fit was y = -7x + 250 where x represents the length of the sale in hours and y represents the number of cookies left. Interpret the slope in context.a. As the length of the sale increases by 1 hour, the number of cookies left increases by 7.b. As the number of cookies increase by 250, the length of the sale decreases by 7 hours.c. As the length of the sale increases by 1 hour, the number of cookies left decreases by 7.d. As the length of the sale decreases by 7 hours, the number of cookies increases by 250.15. Using the normal distribution shown, in what interval must the mean and median lie?36572528583300a. 10-20c. 50-60b. 70-80d. 90-100The following scatter plot displays the amount of money made at a family yard sale. 12703365500a. Using the points (1, 55) and (3.5, 160), write the equation for the line of best fit.Another student decided to use the points (0.5, 20) and (3, 150) to make what she believed was a better regression equation. Her answer was f(x) = 52x + 4. Use this student’s model to answer questions b and c. b. If the family wanted to make a profit of $250 dollars at the yard sale, how long should they plan to hold the sale? Show all algebra work.c. The family decides to extend the yard sale to be 10 hours long. How much money can they expect to make? Show all algebra work. ................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download