7. The lower quartile of 50 students in their final test in Mathematics 10 is 20. Which of the following statements istrue?A. Twenty-five percent of the students got a score of less than or equal to 20.B. Seventy-five percent of the students got a score of less than or equal to 20.C. Thirty students got a score of 20.D. Twenty percent of the students got a score of greater than or equal to 20.8. In a 60-item test, Pinty got a score of 52, which is the 90th percentile. What does it mean?A. She got the highest score.B. Her score is higher than 10 of her classmates.C. 90% of the class did not pass the test.D. She surpassed 90% of her classmates.9. The 8th decile of a distribution of scores in Mathematics 10 is 45. Which of the following would be theinterpretation?A. 20% of the students got a score of less than 45.B. 25% of the students got a score of 45.C. 80% of the students got a score of greater than or equal to 45.D. 80% of the students got a score of less than or equal to 45.10 T00 1noth

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Answered: 7. The lower quartile of 50 students in…

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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1. The lower quartile is equal to what? A. 50th percentile B. 25th percentile C. 2nd decile D. 3rd quartile 2. In the set of scores 14, 17, 10, 22, 19, 24, 8, 12, and 19, which of the following is the median score? A. 17 B. 15 C. 16 D. 13 3. percentile? Which of the following is equivalent to the 50th A. 5th decile B. 2nd quartile C. mean score D. all of the above For items 4 to 6, consider the score distribution of 15 students given below: 83 72 87 79 82 77 80 73 86 What is the median score? 81 79 82 79 74 74 4. A. 80 B. 82 C. 73 D. 79 5. Which of the following is the lower quartile? A. 72 B. 74 C. 79 D. 86 6. What is the value of the second decile? A. 72 B. 74 C. 83 D. 85 For items 7 to 10, consider the scores 70 Grade 10 students in Mathematics Test. Less than Cumulative Scores Lower Boundaries Frequency Frequency 95-99 3 94.5 70 90-94 6 89.5 67 85-89 2 84.5 61 80-84 7 79.5 59 75-79 9 74.5 52 70-74 11 69.5 43 65-69 12 64.5 32 6 60-64 59.5 20 55-59 5 54.5 14 3 50-54 49.5 9 4 44.5 6…
Find the range for the following set of scores. 29,63,42,75,99,18,29,53,77 O a. 81 O b. 48 O C. 99 O d. 42
Assume critical reading scores for a standardized test are distributed as N(580, 100). Complete parts (a) through (d) below.
D. Given o = 4.5 and u = 30, find the raw scores of the following. Show your complete and neat solutions. Avoid erasures. 14. z = 1.25 17. z = -0.30 15. z = -1.67 18. z = 2.96
19. A high school math teacher summarized the 35 math SAT scores for the students in her calculau class. The mean for the class was 521 and themedian was 535. The range of the scores was 235 and the highest score in the entire class was 675. Approximately 40% of the lass scored higher than 562. State whether each of the following is true or false. a. The 45th percentile exceeds 540. b. The lowest score in the class was 440. c. The z-score for a score of 510 is a negative number. d. The third quartile exceeds 562. e. The percentile rank of 562 is 40.
A second-grade teacher wants to compare scores on a reading assessment at the beginning of the year to scores on the same assessment at the end of the year. There are 28 in the class, and all students take both of the assessments. What is the degrees of freedom value for the paired-samples t test? a. 54 b. 55 c. 28 d. 27
A college professor conducted student evaluations at the end of a semester. One important question asked was, "Would you recommend this professor to a friend?” Fifty-four students responded using the following 1-to-5 rating scale. 1 = "absolutely not" 2 = "probably not” 3 = "no opinion" 4 = "probably yes" 5 = "absolutely yes" Student responses were recorded. "Blank" indicates that a student skipped this question on the evaluation. 4 #28: #1: Blank #10: #2: Blank #3: #4: Blank #5: #6: #7: #8: 4 #9: 5 4 5 2 # 11: #12: #13: #14: #15: # 16: #17: 3 Blank 5 Blank Blank 1 5 Blank # 19: #20: #21: #22: #23: #24: #25: #26: 4 #18: Blank #27: 1 2 #30: 1 #31: 3 Blank 5 #29: 5 Blank #32: #33: #34: #35: 1 #37: 5 Blank 4 1 5 4 5 #38: #39: #40: # 41: #42: #43: #44: #36: Blank #45: 2 #46: Blank 1 5 4 Blank #49: 5 #47: Blank #48: #50: #51: #52: Blank #53: 1 5 4 5 5 1 5 1 #54: Blank
Use the chart below to answer questions 1-6 about the ACT's. The ACT is a standardized test used by college admissions offices as a factor in whether an applicant is or is not admitted to their college. Since so many students take this test each year, the distribution of results are typically approximately normal. The table below shows the mean and standard deviation for each section of within the ACT for all test takers in the years 2015, 2016, and 2017. Standard Section Mean Deviation English 20.3 6.8 Math 20.7 5.4 Reading 21.4 6.5 Science 20.9 5.5 STEM 21.0 5.2 A
1. A report in a national magazine estimated that 39 percent of American husbands do not know the color of their wives' eyes. Bill Cornett is a marriage counselor in a clinic in New Orleans. He feels the figure is higher for husbands in the greater New Orleans area. A sample of 264 husbands in this area yielded 111 who did not know the true color of their wives' eyes. a. Conduct a test of significance to determine whether the value of 0.39 can be rejected as too low for husbands in New Orleans. Be sure to state your hypotheses, all relevant statistics, a list of technical conditions, and a conclusion to your test. b. Produce a relevant confidence interval designed to capture the true proportion of American husbands who do not know the color of their wives' eyes. Explain how your interval backs up the result of your test of significance from part a.
10. A student has a mean score of 75 on three tests. If her scores on the first tests are 80 and 75, what is her score on the third test? a. 71 b. 72 C. 73 d. 74 e. 70
1. Which of the following are examples of statistics? a) Average weight of all adult dogs.b) The 75th percentile of all adult dog weights.c) The largest dog eats lots of blueberry pizza.d) The weight of the largest dog ever.
37. The mean score for a set of data is marked by the dotted line on the following graph. Which value is a likely z-score for the indicated value? Choose from a.-2.1, b. 0, or c. 2.7. Z= ? X

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