W8Char ViewCorrin theh N in theCF6125% vZoomAdd PageHighSchool¶ 88TableMacBook AirInsert.F7We collect a sample of 100 people and observe the following:$HW11 chi square practicePublic 20Private 10total 30ChartDilF8@Text Shape Media CommentHW11: Chi-Square Test PracticeMajorHumanities Sciences351550DDF9Business51520Test the hypothesis that school type and subsequent major are not independenttotal6040100AF10QCollaborateIWed May 3 11:14 AMGFormat Document

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Answered: Test the hypothesis that school type…

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 research study was conducted to examine the clinical efficacy of a new drug used to improve memory. Students were randomly assigned to one of four groups: a placebo group, a group that received a low dose of the drug, and a group that received a moderate dose of the drug, and a group that did not receive any dose. Students were administered their respective doses and had to study for a Spanish vocabulary test. The group who did not receive any drug, was just told to study for the test. None of the 31 students spoke Spanish. Below is an ANOVA table used to analyse the results from the test: Source SS df MS F Between XX XX XX XX Within XX ? XX Total What is the missing value for the degrees of freedom for the "within" row (marked by a ?)? Answer:
At a stop sign, some drivers come to a full stop, some come to a rolling stop (not a full stop, but slow down), and some do not stop at all. Test if there is an association between gender and type of stop (full, rolling, or no stop). Data is collected by standing a few feet from a stop sign and taking note of the type of stop and the gender of the driver. Below is a contingency table summarizing the data that was collected. Do the data provide enough evidence to show that there is an association between gender and type of stop (full, rolling, or no stop)? Test at the 3% level and round expected values to one decimal place. Type of Stop Male (Observed) Male (Expected Value) Female (Observed) Female (Expected Value) Row Total Full Stop 11 21 32 Rolling Stop 15 15 30 No Stop 9 8 17 Column Total 35 44 79 H: HypothesesHo:Ho:Select an answer Gender male female Male and Select an answer Type of Stop male female Female are Select an answer independent dependent…
P_46-24 Aat 6
A certain affects virus 0.8% of the population. A test used to detect the virus in a person is positive 88% of the time if the person has the virus (true positive) and 13% of the time if the person does not have the virus (false postive). Fill out the remainder of the following table and use it to answer the two questions below. (enter answer with no commas, i.e. as 1000 not 1,000.) Infected Not Infected Total Positive Test [a] [b] [c] Negative Test [d] [e] [f] Total 800 99,200 100,000 i) Find the probability that a person has the virus given that they have tested positive. (Round your answer to the nearest tenth of a percent and do not include a percent sign.)[g]_______ % ii) Find the probability that a person does not have the virus given that they test negative. (Round your answer to the nearest tenth of a percent and do not include a percent sign.)[h]________ %
AD (Alzheimer's disease) causes progressive cognitive impairment. A diagnostic blood test for AD was proposed. An evaluation of the blood text involved fifty known AD patients and forty control who did not have AD. Of those who had AD, forty eight tested positive on the blood test and two tested negative. Of those without AD, three tested positive on the blood test and thirty seven tested negative. g. What is the NPV? Use this in a sentence explaining to a person what their negative test results suggests.
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When we examine a proposed experimental study for possible confounds, which of these should look for? Confounds due to the age of the participants the order in which the conditions of the study were tested the size of the sample whether the study has ever been carried out before and published (a and b), but not (c and d)
What is B0,B1, B2,B3
A study with a factorial design always has: O Multiple dependent variables O Multiple independent variables O A single independent variable A single dependent variable
In a survey of statistics students, it is found that 54 use RStudio, 43 use SAS, and 32 use Stata, for data analysis. Moreover, 29 use both RStudio and SAS, 18 use both RStudio and Stata, and 21 use both SAS and Stata, for data analysis. Fifteen of these students use RStudio, SAS, and Stata, while nine of them use tools other than R Studio, SAS, and Stata. a. How many students use RStudio only for data analysis? b. How many students use at least two software for data analysis? c. How many students use SAS or Stata, but not both?
2. Investigate using the Chi square test of independence whether the positive and the negative attitudes toward mathematics of 450 fourth year high school students are independent of the course they wou ld like to pursue in college. Use the following data collected by a researcher. For the level of significance, use O. 05 Courses Attitudes Positive Negatives BSE 32 34 BS Accountancy BS Psychology BS Civil Engineering 45 24 15 26 34 4 BSHRM 44 BS in International 17 26 Relation BSCS 15 24 BS Math 32 BSIT 13 12 BS in Biology 31 27
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