Pew Research surveyed respondents by telephone, drawing arandom sample of landlines and another random sample of cellphones. For those numbers that were valid, they report thefollowing:LandCellTotalNo55242594Answer/BusyVoicemail334728436190Contact8399861217,011Total12,29811,49723,795Are the results they find independent of the telephone type?a) Under the usual null hypothesis, what are the expected values?b) Compute the x2 chi squared statistic.c) How many degrees of freedom does it have?d) What do you conclude?

Hypothesis : Null hypothesis : H0 : The results are independent of the telephone type.…

Answered: Pew Research surveyed respondents by…

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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A series of questions on sports and world events was asked of 14 randomly selected young adult naturalized citizens. The results were translated into sports and world events "knowledge" scores. The scores were: World World Citizen L. M. Zaugg J. B. Simon J. Goulden A. A. Fernandez A. M. Carbo A. 0. Smithy J. J. Pascal Sports Events Citizen J. C. McCarthy A. N. Baker B. B. Beebe L. D. Gaucet C. A. Jones J. N. Lopez A. F. Nissen Sports Events 47 49 87 75 12 10 59 86 62 76 40 61 81 92 87 18 90 86 16 75 35 42 50 51 61 61 60 61 S Click here for the Excel Data File a-1. Calculate the sum of d2 and find n. n
Researchers asked parents of 19 American children, ages 8 to 12, to complete surveys on the number of hours their children spent reading and the number of hours they spent on screen-based media time. Each of the children also underwent magnetic resonance imaging (MRI) to assess connectivity in the brain. More time spent reading was associated with higher connectivity, while more screen time was associated with lower connectivity in the brains of the children. 1. What is the sample in this study? c 2. What is a possible population? F6 3. Is this an experiment or an observational study? Why did you make that decision? 4. Can we conclude that more time spent reading increases connectivity in children's brains? 5. Identify a possible confounding variable and explain how it meets the definition of a confounding variable. MacBook Air tv♫ F7 * 2 DII F8 ( ZA F9 1 F10 & F11 DOCX A
An article reported that in a particular year, there were 717 bicyclists killed on public roadways in a particular country, and that the average age of the cyclists killed was 43 years. These figures were based on an analysis of the records of all traffic-related deaths of bicyclists on public roadways of that country. (a) Does the group of 717 bicycle fatalities represent a census or a sample of the bicycle fatalities for that year? O a census O a sample (b) If the population of interest is bicycle traffic fatalities for this particular year, is the given average age of 43 years a number that describes a sample or a number that describes the population? O a number that describes a sample O a number that describes the population
If Ashley wants to test for GPA differences among first-, second-, third-, and fourth-year college students, which of these difference tests should she use? A. chi-square test of independence B. between-subjects, two-way ANOVA C. between-subjects, one-way ANOVA D. repeated-measures ANOVA
Please answer questions D and E for me
In a school, a test has been conducted in seven subjects and the marks of four students have been recorded in a table as shown below: Student-1 Student-2 Student-3 Student-4 99 96 97 97 99 93 87 90 92 99 91 86 92 92 90 91 88 97 99 96 95 91 96 91 99 85 86 93 Apply one-way ANOVA and check whether there is any significant difference among the three student scores or not
Data was collected for 224 randomly selected 10 minute intervals. For each ten-minute interval, the number of people entering the atrium of a large mall were recorded. The data is summarized in the table below. Number of Guests Frequency 120 – 124 23 125 – 129 32 130 – 134 97 135 – 139 56 140 – 144 16 What is the class width for this GFDT?
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A De Anza student decided to determine whether the percent of men who participate in sports at De Anza College is higher than the percent of women who participate in sports at De Anza College. Out of 67 women, 12 said they participate in sports. 13 of the 45 men surveyed said they participate in sports. a. ) What are the type I and type II errors? Explain them in the context of this problem.b. ) Describe the sample statistics in words. What is the distribution of the sample statistic? Explain why you used this distribution.Can someone please help me make sense of these questions?
To compare two elementary schools regarding teaching of reading skills, 12 sets of identical twins were used. In each case, one child was selected at random and sent to school A, and his or her twin was sent to school B. Near the end of fifth grade, an achievement test was given to each child. The results follow: Twin Pair 1 2 3 4 5 6 School A 80 145 118 90 112 118 School B 83 135 115 105 105 113 Twin Pair 7 8 9 10 11 12 School A 98 112 115 144 124 96 School B 93 87 98 132 135 105 Suppose a sign test for matched pairs with a 1% level of significance is used to test the hypothesis that the schools have the same effectiveness in teaching reading skills against the alternate hypothesis that the schools have different levels of effectiveness in teaching reading skills. Let p denote portion of positive signs when the scores of school B are subtracted from the corresponding scores of school A.…
Mrs. Cunan introduced a Gallery Walk Technique in her Science class. He gave a pretest and posttest to her 20 students and gathered the following data: Student Pretest (x1) Posttest (x2) 1 10 15 2 30 35 3 15 25 4 15 25 5 20 20 6 10 20 7 18 22 8 14 20 9 15 20 10 20 15 11 18 30 12 15 10 13 15 16 14 20 25 15 18 15 16 40 45 17 10 15 18 10 10 19 12 18 20 20 25 At .05 level of significance, is the Gallery Walk Technique effective? Follow the steps in hypothesis testing. Answer the following. Problem # ________ What is the appropriate statistical test to use? _______________________________________ _____________________________________________________________________________ State Null Hypothesis: _________________________________________________________…
You do not need to perform the test just state the appropriate chi-square procedure and state the null and alternative hypotheses for the test.

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