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- An observer at a busy bus stop did a 30-minute study of 3 buses. Given the following -Alight time =2 sec -Board time=3 sec -Door opening time =5 sec Determine the number of passengers alighting from the back door for the 3 busesIs there a positive, negative, or no relationship between mask wearing and COVID-19 contraction? Explain your answer.A special education teacher did research on whether or not there is a relationship between the number of students in his class and the number incidents of “acting out” behaviors exhibited by the autistic students in the classroom. He collects data for a year and aggregates them by month. He obtained the statistics below, r= -.863 R2=.74 b= -1.212294 a= 131.176598 10.) How does the presence of more students affect the incidents in the class? a) as students are added the incidences increase b) as students are added the incidences decrease c) the number of students does not affect acting out d) the number of students caused more incidents How much of the variability of acting out is explained by the number of students in the class?___________
- For a chi square test of independence, with 3 rows and 2 columns, what is the degrees of freedom?If SSR=8and SSE=32, determine SST, then compute the coefficient of determination, r2, and interpret its meaning. SST= r2=A drug company creates a medicine designed to prevent colds, and states that it is equally effective for men and women. To test this claim, they give the medicine to 100 men and 200 women. At the end of the study, 33 men and 95 women caught a cold. Can we say that the drug is equally effective for men and women? (Use α = .01)
- For this problem, assume that outcome O1has frequency 1/a, outcome O2 has frequency 10/a and outcome O3 has frequency 8/a What is the value of aPlease see picture and answer questions A and B (a)Which city had the highest noon temperature? Choose one (City A/ City b/ Both had the highest) (b)Which city had noon temperatures with a larger interquartile range (IQR)? Choose one (City A/ City B/ Both had the same IQR)State the conditions for applying the Chi-square test. What cautions are to be taken in using this test?
- - What is the main advantage of Newton's interpolation over Lagrange's interpolation?We want to assess the relationship between class rank and how many minutes a person spends on social media. We randomly select 5 students from UMD and have them report their class rank and number of minutes per week they spend on social media. We get the following data. Because class rank is ordinal data, we want to compute Spearman's rho. Please compute the numerator for Spearman's rho and use 4 decimal places for all computations and final answer. (the numerator is referring to the numerator of the fraction, not including the 1- part) Minutes on Social Class Rank Media per Week 100 1,302 500 25 250 10 600 50 200A person with tuberculosis is given a chest x-ray. Four tuberculosis x-ray specialists examine each x-ray independently. If each specialist can detect tuberculosis 83% of the time when it is present, what is the probabilty that at least 1 of the specialists will detect a person positive.
