The popularity of computer, video, online, and virtual reality games has raised concerns about their ability to negatively impactyouth. Based on a recent survey, 1808 fourteen- to eighteen-year-olds in Connecticut high schools were classified by theiraverage grades and by whether they had or had not played such games. The following table summarizes the findings. Theobserved and expected counts are given side by side.ObservedExpectedA's and B'sC'sD's and F'sA's and B'sC'sD's and F'sPlayed games736450193717.7453.1208.2Never played games20514480223.3140.964.8Find the chi-square statistic, X² .(Use decimal notation. Give your answer to two decimal places.)x? :II

Given The observed and expected counts of computer and video games Find Chi square Statistic x2 We…

Answered: The popularity of computer, video,…

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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In each scenario, identify the population, the sample, and any population parameters or sample statistics that are given. In a recent study, US graduates of for-profit higher education institutions were between 4.8 and 6.7 percentage points more likely to be unemployed than those at non-profit institutions and community colleges.
The color of the Star Trek uniform represents each crew-member's work area. In the original Star Trek series, blue shirts are worn by medical and science staff, gold shirts are worn by the command division, and the red shirts were worn by engineering, security and communications division. We will statistically assess whether there is a connection between uniform color and the fatality rate. The table below shows a sample of how many crew-members in each area have died onscreen and their shirt color. Use a = 0.05 to test to see if a crew- member's fatality onscreen is dependent on their uniform color. Blue Gold Red Total Alive Dead 40 11 18 6 29 25 87 42 Total 51 24 54 129
In the class poll from the beginning of the year, you were asked what color car you drive. The results are summarized below. aqua 3 beige/tan/gold 39 black 80 blue 44 green 21 orange 3 pink 1 purple 3 red 45 silver 63 white 74 yellow 1 What is the mode for this data set?
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The premiere of Game of Thrones' seventh season set a series record of 10.1 million viewers tuning in to the live broadcast, and the season finale got even more than that at 12.1 million. A researcher at HBO believes that the average number of viewers watching live is not equal to the average number of those streaming online. The data below demonstrate a sample the number of of people watching live for each episode and the number of people streaming for each of the same episode. Episode Live (millions) Streaming (millions) Season 1 Episode 1 2.9 0.7 Season 3 Episode 4 8.4 5.0 Season 5 Episode 1 8.7 6.3 Season 5 Episode 5 8.6 6.0 Season 6 Episode 3 9.3 8.4 Season 7 Episode 1 10.11 6.4 Season 7 Episode 5 10.72 6.7 Season 7 Episode 7 12.10 7.5 Based on the results of your t-test, can we conclude that the mean number of people viewing live is different from the mean number of people streaming online? Group of answer choices a) No, because the p value is greater…
According to a retail organization, holiday shoppers spent an average of $935.58 over the Thanksgiving weekend in 2016. The accompanying data show the amount spent by a random sample of holiday shoppers during the same weekend in 2017. $1,029 $875 $969 $838 $825 $813 $962 $1,032 $990 $996 $921 $664 $1,013 $1,030 $979 $878 Complete parts a through c. Test the hypothesis that shoppers spent less than an average of $935.58 over the Thanksgiving weekend in 2017 using α=0.05.
A psychologist at a private mental health facility was asked to determine whether there was a clear difference in the length of stay for patients with different categories of diagnosis. Looking at the last seven patients in each of the three major categories, the results (in terms of weeks of stay) were as follows. Using the data below, test whether the length of stay for patients vary based on category of diagnosis. Diagnosis Category Affective Disorders Cognitive Disorders Drug-related Conditions 7 12 8 6 8 10 5 9 12 6 11 10 9 11 9 5 10 11 6 9 12 The above scenario requires a one-way Anova, with a bar graph. Question - I need to write an explanation for the output given. I am to include a statistical notation and explanation as to whether the results are significant or not significant. Examples of Explanation: Non-significant:A One-Way ANOVA was conducted to examine whether a preceding situation (watching a…
A social psychologist wanted to determine whether attitudes of men toward abortion were different in rural and urban areas. He prepared a questionnaire and administered it to a group of city dwellers and a group of country dwellers. Each city man was matched with a country man on age, income, and education. High scores indicate positive attitudes toward abortion. Here are the questionnaire scores. Rural Men Urban Men 22 25 19 23 18 20 17 18 15 12 10 9 6 4 4 3 a. What statistical method should be used and why? b. Calculate a 95% confidence interval about the difference in the two populations. c. Use the CI to test the null hypothesis that rural and urban men have identical attitudes toward abortion.
The CEO of a small company earns $400,000 per year, and the 10 employees each earn $50,000 per year. Which of the measures of central tendency of data ( shown below) is strongly affected by the CEO's salary? why? a) the mean b) the median c) the mode d) none of the above
What percent of females thought that they were almost certain to be married in the next 10 years?
You saw back in Chapter 2 that the mean, median, mode, and midrange are used to indicate where data is centered in a data set, or in other words what a typical value in the set is. A question that is often asked is, "If they're all supposed to do the same thing, why is there more than one?" Isn't one enough? In this exercise, you will be given two small sets of data. For each set, a. find the mean, median, mode and midrange b. in your opinion, decide which of the measures BEST represents all the values in the set (best indicates a typical value), and which one does this the WORST. c. post your responses and justify them by explaining why Don't forget to respond to at least one of your classmate's posts. With this exercise, "more is better." I'll elaborate after the deadline. • Set A: the salaries of 10 employees at a company (in thousands of dollars): 50, 50, 50, 50, 50, 50, 50, 50, 50, 500 • Set B: the grades of 9 students on an exam: 20, 25, 30, 35, 40, 45, 100, 100, 100
In a 2012 report from the U.S. Department of Education breaking down the race and gender of every U.S. college graduate receiving a bachelor's degree in 2009-2010, we see the following data for white, black, and Hispanic graduates. (Numbers are in 1000s.) Race White (Expected) Black (Expected) Hispanic (Expected) Total Gender Males 514 (508.32) 56 (70.01) 55 (59.40) 625 Females 654 (689.68) 109 (94.99) 85 (80.60) 848 Both What is the contribution of Hispanic females to the chi-square test-statistic? A. O 0.24 B. 4.40 C. 80.60 D. 60.71 1198 165 140 1473 Source: "Degrees cConferred by Sex and Race," National Center for Education Statistics, U.S. Department of Education. https://nces.ed.gov/fastfacts/display.asp?id=72

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