d. Explain the meaning of the phrase "90% conf7.60 Interactions in a children's museum. Refer to the EarlyChildhood Education Journal (Mar. 2014) study Ofinteractions in a children's museum, Exercise 2.19 (p. 41).(Interactions by visitors to the museum included show-and-tell, learning, teaching, refocusing, participatory play,advocating, and disciplining interactions.) Recall that theresearchers observed a sample of 170 meaningful interac-tions, of which 81 were led by children and 89 were led byadult caregivers.a. Give a point estimate of the true proportion of allmeaningful interactions in a children's museum that arebyildren.b. Form a 90% confidence interval around the proportion,part a.c. Interpret the interval, part b, in the words of the study.d. Suppose an educator claims that the true proportion ofall meaningful interactions in a children's museum thatare led by children is 35%. Make an inference about thisclaim.7.61 Is Starbucks coffee overpriced? The Minneapolis StarTribune (Aug. 12, 2008) reported that 73% of Americanssay that Starbucks coffee is overpriced. The source ofthis information was a national telephone survey of 1,000American adults conducted by Rasmussen Reports.a. Identify the population of interest in this study.b. Identify the sample for the study.c. Identify the parameter of interest in the study.d. Find and interpret a 95% confidence interval for theparameter of interest..62 Nannies who work for ceļehrities The

Name: d. Explain the meaning of the phrase "90% conf7.60 Interactions in a
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Description: d. Explain the meaning of the phrase "90% conf7.60 Interactions in a children's museum. Refer to the EarlyChildhood Education Journal (Mar. 2014) study Ofinteractions in a children's museum, Exercise 2.19 (p. 41).(Interactions by visitors to the mus

To calculate the point estimate, you will need the following values: Number of successes S: for…

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Dy Interactions in a children's museum. Refer to the Childhood Education Journal (Mar. 2014) stu interactions in a children's museum, Exercise 2.19 (Interactions by visitors to the museum included and-tell, learning, teaching, refocusing, participato advocating, and disciplining interactions.) Recall t researshers obseryed a sample of 170 meaningful

Dy Interactions in a children's museum. Refer to the Childhood Education Journal (Mar. 2014) stu interactions in a children's museum, Exercise 2.19 (Interactions by visitors to the museum included and-tell, learning, teaching, refocusing, participato advocating, and disciplining interactions.) Recall t researshers obseryed a sample of 170 meaningful

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) A public health researcher is interested in some factors that influence heart disease. In a survey of 68 randomly selected localities, he gathered data on the percentage of people in each locality who bike to work “Biking”, the percentage of people in each locality who smoke “Smoking”, and the percentage of people in each locality who have heart disease “Heart.Disease”. The researcher wants to find which explanatory variable will be a better predictor of the response variable, “Heart.Disease”. Investigate the relationship between the explanatory variables and response variable to help the researcher find the better predictor. The dataset is called “Heart Disease.” b) The regression equation for “Biking” and “Heart. Disease is= 18.115809 - 0.20845321 Biking. Q1) In one randomly selected location, the researcher found the biking rate was 70%. Use this information to predict the corresponding rate of heart disease in that location. Use the regression equation in part (h) to predict the…
Which of the following scenario is an example of a matched-pairs design? Group of answer choices comparison of the aggression scores of boys and girls comparison of third-grade boys to the known population comparison of the aggression scores when are in third grade, then in fifth grade comparison of the aggression scores of third-grade students and fifth-grade students matched on gender
A survey was conducted to determine whether hours of sleep per night are independent of age. A sample of individuals was asked to indicate the number of hours of sleep per night with categorical options: fewer than 6 hours, 6 to 6.9 hours, 7 to 7.9 hours, and 8 hours or more. Later in the survey, the individuals were asked to indicate their age with categorical options: age 39 or younger and age 40 or older. Sample data follow. Age Group Hours of Sleep 39 or younger 40 or older Fewer than 6 38 36 6 to 6.9 60 57 7 to 7.9 76 74 8 or more 66 93 (a) Conduct a test of independence to determine whether hours of sleep are independent of age. (b) What is your estimate of the percentages of individuals who sleep fewer than 6 hours, 6 to 6.9 hours, 7 to 7.9 hours, and 8 hours or more per night?
This data set contains the achievement test (English as a Second Language) results and some background data collected during experimental trial of a new ESL program. The study was one year in duration. Students were allocated to the experimental ESL program class and a regular program control class on a random basis. Vocabulary and grammar tests were administered to the students in both groups at the beginning and the end of the school year. Variables The dataset includes 24 cases and 7 variables: Student ID Group (1 - experimental, 2 - control, 9 - missing) Gender (1 - male, 2 - female, 9 - missing) Pre-test vocabulary scores (scores range from 0 - 25, 99 - missing) Pre-test grammar scores (scores range from 0 - 25, 99 - missing) Post-test vocabulary scores (scores range from 0 - 25, 99 - missing) Post-test grammar scores (scores range from 0 - 25, 99 - missing) (a) develop a research question that can be addressed with independent-samples t test (b) state the null and alternative…
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Learning math Developers of a new math curriculumcalled “Accelerated Math” compared performances ofstudents taught by their system with control groups ofstudents in the same schools who were taught using traditional instructional methods and materials. Statis-tics about pretest and posttest scores are shown in the table. (J. Ysseldyke and S. Tardrew, Differentiating MathInstruction, Renaissance Learning, 2002)a) Did the groups differ in average math score at thestart of this study? b) Did the group taught using the Accelerated Math pro-gram show a significant improvement in test scores? c) Did the control group show a significant improve-ment in test scores? d) Were gains significantly higher for the AcceleratedMath group than for the control group? Instructional MethodAcc. math ControlNumber of students 231 245Pretest Mean 560.01 549.65St. Dev 84.29 74.68Post-test Mean 637.55 588.76St. Dev 82.9 83.24Individual gain Mean 77.53 39.11St. Dev. 78.01 66.25
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Dataset: NES. Variables: spend8, nesw.) The NES dataset contains spend8, which records the number of government policy areas where respondents think spending should be increased. Scores range from 0 (the respondent does not want to increase spending on any of the policies) to 8 (the respondent wants to increase spending on all eight policies). The NES, of course, polls a random sample of U.S. adults. In this exercise you will analyze spend8 using the Analyze ▶ Compare Means ▶ One-Sample T Test procedure. You then will draw inferences about the population mean. Make sure you weight observations using the nesw variable so your results are nationally representative. A. The spend8 variable has a sample mean of ______.
.Seven instructors are rated by first and seconf year students on “clarity of presentation” and the results are tabulated. Is there a significant correlation between the ratings of freshmen and sophomores on the clarity of presentation of theseveninstructors? Intructor Freshmen Sophomores 1 44 58 2 39 42 3 36 18 4 35 22 5 33 31 6 29 38 7 22 38
5 8 Mulitple Choice Identify the type of causal relationship for the example below: "Leadership ability is strongly correlated with academic achievement in high school" A) accidental B) presumed relationship C) cause-and-effect D) reverse cause-and-effect
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Store Window Creativity and Shopper Behavior. Do more creative store-window displays affect shopper behavior? Six main-street retailers selling everyday fashion items were used in the study. Pretests with shoppers showed the six stores to be comparable on brands and consumer perceptions of value for the money. Three of the retailers had more creative windows, in terms of displaying items in a more innovative and artistic manner versus the less creative windows, which had a more concrete focus on the items on display. All display windows were of similar dimensions. Observers, in close proximity but out of sight of shoppers, watched their behavior as they passed the display windows, and for each shopper the observers recorded whether the shopper looked at the window or entered the store. A total of 863 shoppers passed the more creative windows and 971 passed the less creative windows. The study found that a higher percentage of shoppers looked at and entered the stores with the more…