11. One sample has a mean of M = 5 and a second samplehas a mean of M = 10. The two samples are combinedinto a single set of scores.a. What is the mean for the combined set if both ofthe original samples have n = 5 scores?b. What is the mean for the combined set if the firstsample has n = 4 scores and the second samplehas n= 6?c. What is the mean for the combined set if the firstsample has n = 6 scores and the second samplehas n= 4?%3D

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Answered: 11. One sample has a mean of M = 5 and…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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1a. For a given data set, the mode is 10, the median is 8, and the mean is 5. Which below is the likely shape for the distribution? a. negatively skewed b. no skew (symmetrical) c. positively skewed 1b. What frequency distribution graph is appropriate for scores measured on a nominal scale? a. either a histogram or a polygon b. only a bar graph c. only a polygon d. only a histogram 1c. What is the shape of the distribution for the following set of data? Scores: 1, 2, 3, 3, 4, 4, 4 5, 5, 5, 5, 6 a. cumulative b. symmetrical c. positively skewed d. negatively skewed
Suppose you have scores of 80, 85, 90, and 80 on quizzes in a mathematics class. Complete parts (a) through (c). a. What is the mean of these scores? b. What score would you need on the next quiz to have an overall mean of 85? c. If the maximum score on a quiz is 110, is it possible to have a mean of 90 after the fifth quiz? OYes O No
5. Imagine we collect data from 132 people. Each person writes two tests (test 1, test 2). The correlation between observed scores on the two tests is 0.64. For test 1 observed scores: M = 70.00, SD = 10.00, and r = 0.87. For test 2 observed scores: M = 75.00, SD = 13.00, and rx = 0.71. What is the correlation between true scores on the two tests? %3D %3D (a) 0.90 (b) 0.70 (c) 0.66 (d) 0.81
Creating graphs gives you a picture of your data. In our visual-oriented world, graphing data is one way of "letting the statistics speak for themselves." The proper choice of graph depends on the nature of the variable. Most graphs are pie charts, bar graphs, histograms, frequency polygons or timelines. There are others, but in these are the graphs you will see most often in media, public opinion polls and research studies. A histogram usually has vertical bars placed on the horizontal axis (x-axis) that touch each other, although some texts no longer require that the bars touch. The y-axis shows the frequency, percetage or rate of occurrence. Figure 1. Children's television viewing time. 6. 2. 10 15 20 25 30 35 40 45 50 Viewing time (hours per week) Note: Television viewing time per week for the sample of 30 preschool children from low-income families. Frequency refers to the number of children in each category of viewing time.
3. The amount of time (in minutes) it took each individual in a sample of athletes to run a mile was recorded. In this particular sample, most of the athletes were able to run the mile quickly, but there were a small number of athletes who were not fast runners and needed more time to complete the mile. Two measures of center were computed for this sample: 12.9 minutes and 9.5 minutes. One of these measures is the mean and one is the median. Which measure must be the mean? A. The mean is 9.5 minutes because the distribution of running times would be skewed to the left. B. The mean is 9.5 minutes because the distribution of running times would be skewed to the right. c. The mean is 12.9 minutes because the distribution of running times would be skewed to the left. D. The mean is 12.9 minutes because the distribution running times would be skewed to the right.
In a case study, we have 2 sets to examine. The set M has a mean of 12,total number of data points are 68.Let the second set U have mean of 15, with total number of data points 44.Now we combine both the sets M and U.Calculate the mean of combined sets (U+M). (Round your answer to three decimal places.)
18. Which statement is true about the quartile and percentile? A. The median is the 50th percentile, and it is the 3rd quartile that separates the bottom 50% from the top 50% of scores of a dataset. B. The first quartile is the 25th percentile, which separates the bottom 25% from the upper 75% scores of a dataset. C. The 4th quartile is the 75th percentile that separates the bottom 75% from the top 25% scores of a dataset. D. Answers A, B, C, and D are correct. E) Answers A and B are correct. 19. Which statement is true about the classes of a group frequency distribution of a dataset? A. Classes of a group frequency distribution of an overlapped discrete dataset are unsuitable for making a histogram. B. Nominal datasets are suitable for making classes of group frequency distribution. C. Classes of a group frequency distribution of none overlapped discrete dataset could be overlapped by subtracting 0.5 from the lower-class limits and adding 0.5 from the upper-class limits. D. In…
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…
4. Suppose a fourth movie reviewer is added to the set below. What would the fourth rating need to be to make the mean of the new data set equal 6? 0 OA. 2 OB. 3 O c. 5 O D. 6 1 2 3 4 5 6 7 8 9 10
1. In 1955, Life Magazine reported that a 25-year-old mother of 3 children, worked an average of 80 hours each week. Recently, some researchers have been studying whether the women’s movement has resulted in an increase in the work week hours for women (combining employment and at-home work). A study was done to find out if the mean work week has, in fact, increased. A random sample of 81 women were surveyed and the mean was 83 hours with a standard deviation of 10. Using a 95% confidence level, does the sample data support the researcher’s claim that the average number of weekly hours that women work, is greater than 80? a. What statistical test will you use to test this data ? b. State the null and alternative hypothesis. i. H0: ii. Ha: c. What are the confidence intervals? d. What is the value of the test statistic? e. What is the p-value? f. Circle/highlight the correct decision about the null hypothesis. Reject H0…
25. Suppose exam grades were recorded for 20 students in the class, but one of the grades is no longer readable. If the mean score on the exam was 80 and the mean of the 19 readable scores is 82, what is the value of the unreadable score?
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.

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