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TAMU STAT 303 - ex1af11

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STAT303 Sec 507 Fall 2011 Exam 1 Form A Instructor Julie Hagen Carroll Name 1 Please PRINT your name in the blank above 2 Do not open this exam until you are told to do so 3 There are 20 multiple choice questions on this exam each worth the same Please mark your answers clearly on a GRAY Scantron sheet Multiple marks will be counted wrong 4 You must mark your Scantron form with a Your NAME and UID b Your correct SECTION Thursday 11 10 is 507 12 45 is 508 2 20 is 509 and 3 55 is 510 c This test FORM A B C or D 5 You will have 60 minutes to finish this exam 6 You may use the following a One 8 12 11 formula sheet both sides of your own making b A copy of the standard normal table and the Percent Curve handout c A stand alone calculator i e one that cannot communicate with the internet or anything outside itself 7 You must put all possessions besides the materials listed under your table out of everyone else s way This includes cell phones which must be turned off 8 If you have questions please write out what you are thinking on the back of this test page so that we can discuss it after your results are returned to you 9 If you are caught cheating or helping someone to cheat on this exam you both will receive a grade of zero on the exam You must work alone 10 When you are finished please make sure you have marked your Section and Form and have an answer for every question then turn in your Scantron form and show your ID Turn your exam over upside down and let it at your computer Please sit in the same spot next week so that you can get this back 11 Good luck STAT303 sec 507 Exam 1 Form A 1 A researcher is interested in the effects of sunlight on elderly people i e those over 65 years of age living in Texas Which of the following ways of sampling might tend to produce a biased view of the effect of sunlight on elderly Texans Fall 2011 A Fifty people are randomly selected from a list of all elderly people in Texas B One hundred elderly people are randomly selected from a large nursing home in west Texas C The first thousand elderly people who respond to a phone survey make up the sample D All the above E Both B and C 6 Assuming each bin above contains ONLY the value to the left which of the following describe this histogram 2 What is P 1 06 Z 2 80 A B C D E 0 142 0 1472 0 0409 0 9591 1 8528 3 If we had taken a sample of size 10 from the distribution above and found the probability for the sample mean which of the following would be true A The area probability would be the same since it s the same distribution B The area would be smaller since means vary less than individuals C The area would be smaller since this is a tail area and means have smaller shorter tail areas D The area would be larger since it s for 10 not just one E We don t know that the distribution is normal since n is only 10 4 Sample size n affects A the shape of the population distribution B the shape of the sample distribution distribution of the sample C the shape of the sampling distribution D the variance of the population distribution E the variance of the sample distribution distribution of the sample 5 An entrepreneurial student makes her large front yard available for parking on game day She keeps meticulous records of how many trucks and how many cars park there Over several seasons she has had an average of 10 2 trucks with a standard deviation of 2 1 Which row of the table below is most likely to be the 5 number summary of her truck counts A B C D E Min 0 2 4 6 7 Q1 5 5 8 10 9 Med 6 9 10 12 10 Q3 10 11 12 14 11 Max 15 13 16 18 12 A The 5 Number Summary is 20 50 60 70 100 B The mean is less than the median since it is skewed to the left C The mean is less than the median since it is skewed to the right D The mean is greater than the median since it is skewed to the left E Two of the above are correct descriptions 7 In the histogram above what would happen if the 20year olds became 40 year olds A Nothing since it would still be the same data B The mean and standard deviation would increase C The mean would increase but the standard deviation would decrease D The mean and the median would increase but the IQR and standard deviation would stay the same E The mean and the median would increase but the IQR and standard deviation would decrease 8 Suppose that the serum cholesterol levels of males in a given age bracket have a mean of 223 9 and a standard deviation of 15 8 Two researchers take random samples from this population of males Researcher A takes a random sample of 40 males and researcher B takes a sample of 80 males What can we say about the distributions of the sample means computed by the two researchers A They have the same mean and variance because they come from the same population B The distribution for A has a smaller mean and a smaller variance than for B because the sample size is smaller C The distribution for A has a larger mean and a larger variance because the sample size is smaller D Both distributions have the same mean The distribution for A has a smaller variance than for B because the sample size is smaller E Both distributions have the same mean The distribution for A has a larger variance than for B because the sample size is smaller STAT303 sec 507 9 A sampling distribution Exam 1 Form A 15 A parameter is A is a distribution of all the sample statistics that can be found for one sample B of any statistic has an approximately normal distribution C is a distribution of a sample D of the mean is a distribution of the means computed from all possible samples of a given size n that could be taken from the population E Two of the above are correct 10 Which of the following are important principles in sound experimental design A Controlling the effect of lurking variables B Hand picking experimental subjects to avoid the poor choice of subjects produced by randomization C Replicating each treatment on enough subjects to reduce chance variation in the results D All the above E Two of the above 11 Which of the following is an appropriate graph or summary number for categorical data A …


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