Please answer both questions for upvote Stat 216 Midterm Exam Summer 11 2018: Pa
ID: 3370115 • Letter: P
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Please answer both questions for upvote
Stat 216 Midterm Exam Summer 11 2018: Page 7 of 11 femaly was conducted to compare the age of vehicles which MSU male versus students dri ve. The plot below displays the age of vehicles for a random sample of E' parking lots at MSU based on whether the car belong to a male or a female. Use it to answer the following questions. (a) [2 pts] List all categorical variables displayed in the plot. Parking Lot/ Gender 10 (b) [3 pts] Among the students who parked at 'SB parking, what gender appears to drive older cars?. Explain your reasoning. 3 Female MaleFemale Male (c) [3 pts] Among the students who parked at 'E' parking, what gender appears to have lower variability?. Explain your reasoning. 8. People claim that only 3% of the students who take Stat2 16 at MSU will continue their education in statistics. The math department believes that this value is too low and decides to take a sample of 60 students out of the 800 students registered that semester. Of students, 25 60 test. the 60 or 4 1 .6%) say they will continue to study more statistics. It turns out that the students selected for this study were those that received the highest scores on the first ts] What type of sampling bias could have occurred if the results of this study is applied to all students who take Stat216? Select one: A. Selection bias B. Non-response bias C. Response bias (b) [ 2 pts] Explain your reasoning for part a:Explanation / Answer
Ans 7 a: Age and Gender
Ans 7 b: Male appears to drive older cars. As by seeing the plot , the median and 4th quartile of male drive is much greater than female drive cars.
Ans7 c: Among the students who parked at E, lower variability is for Female as most of the data points is spread between 4-6 age while for male it is 3-7.
Ans 8: A selection Bias
b) As as per definition of Selection bias is the bias introduced by the selection of data for analysis in such a way that proper randomization is not achieved, thereby ensuring that the sample obtained is not representative of the population intended to be analyzed.
Same in our case randomization is not occur, most students scored high so they wanted to study statistics, so in sample we selected. so selection bias.