1.31 IQ Test Scores. Figure 1.18 is a stemplot of the IQ testscores of 78 seventh-grade students in a rural midwest-ern school. 23 Qb(a) Four students had low scores that might be con-sidered outliers. Ignoring these, describe theshape, center, and variability of the remainder ofthe distribution.(b) We often read that IQ scores for large populationsare centered at 100. What percentage of these78 students have scores above 100?AD7 2477988699 013396778swolle340010 002233334410 55566677778911 000011112222333444411 5568899912 00334412 67788813 02 in In13 6

Stemplot of the IQ test scores of 78 seventh-grade students in a rural midwestern school is given…

Answered: IQ Test Scores. Figure 1.18 is a…

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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Each of the boxplots shown summarizes 24 student scores on a recent test in two different classes. The boxplots are drawn using a common numerical scale. Which of the following must be true? 1. The lower 25% of Class B are much more spread out than the lower 25% of Class A 2. More people scored below the lower quartile for Class A than Class B 3. The distribution for Class B is skewed left and has a noticeable outlier as well, while the distribution for Class A is somewhat skewed right 4.Class A had more people between the median and the lower quartile than Class B. 3.The distribution for Class A is somewhat symmetric, while the distribution for Class B is skewed right with a noticeable outlier as well
7.
Consider the population of car drivers in the United States, and how many traffic tickets they've each received over the course of their lives. Would the distribution of these traffic tickets be left-skewed (where we often see mean median)? Pick ONE option Left-skewed Right-skewed It would be unreasonable to guess Potentially both at once
(ii) The lecturer wishes to compare the average scores for Business Statistics between the accounting students and the finance students. He records the marks of a group of 8 students from each course in the following table. Student Accounting course Finance course 78 54 56 95 3 67 68 4 49 71 88 82 76 7 8 62 74 86 85 57 Test at 5% level of significance whether the average score for Business Statistics is different between accounting students and finance students.
when a population distribution is symmetric, unimodal, without outliers?
EXAMPLE 4.9 Students who seek therapy at university counseling centers often do not attend many sessions. For example, in one study, the median number of therapy sessions was 3 and the mean was 4.6 (Hatchett, 2003). Let’s examine the spread of fictional scores for a sample of five students: 1, 2, 4, 4, and 10 therapy sessions, with a mean of 4.2. We find out how far each score deviates from the mean by subtracting the mean from every score. First, we label with an X the column that lists the scores. Here, the second column includes the results we get when we subtract the mean from each score, or X − M. We call each of these a deviation from the mean (or just a deviation)—the amount that a score in a sample differs from the mean of the sample. X X − M 1 − 3.2 2 − 2.2 4 − 0.2 4 − 0.2 10 5.8 But we can’t just take the mean of the deviations. If we do (and if you try this, don’t forget the signs—negative and positive), we get 0—every time. Are you surprised?…
(1). Ten students took a test, and their scores are as follows: 82 90 20 35 60 61 65 75 79 80 (a). Find the sample variance. (b). Find the inter quartile range. (c). show them on the box-plot. Draw a box-plot for the above data in the space given below. If there are any outliers, make sure to : to 20 30 40 50 80 70 90 100
Describe the natures of the two distributions (uniform, normal, skewed left, skewed right), and identify possible outliers.
ASAP
12. The following dotplot shows the results from a previous class. The average word 1 is the Average Word length when students selected their own words and Average Word 2 is when the words were randomly selected. Variable 7 Average Word-2800 88..... Average Word-1- The population mean for word length is 4.3 letters. Comment on results from both graphs and the ability to predict the population mean from a sample. Your answer should be a college level paragraph that consists of a topic sentence, supporting sentences and a concluding sentence.

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