1 If the mode mean and median of a distributio are 9 17 14 respectively and the distribution is single peaked then the distribution is a Bimodel b Skewed right positive c The shape of the distribution cannot be determined with the information given d Skewed left negative 2 A population of quizzes scored in an economics class contains the values 2 6 10 12 10 The population standard deviation of these quiz scores equal a 3 58 b 2 6 10 12 10 5 8 i ii iii iv v 2 8 2 36 6 8 2 4 10 8 2 4 12 8 2 16 10 8 2 4 c 36 4 4 16 4 64 d 64 5 12 8 e 12 8 root squared is 3 58 zero a True a PERCENTILE EXC m2 m231 0 60 b PERCENTILE EXC m2 m231 0 60 m2 m231 60th percentile c d m2 m231 60th percentile a Standard scores b Probability c Statistical inference d Qualitative data 3 The numerical value of the 50th percentile of a distribution can sometimes be less than 4 If an excel user wants to find the 60th percentile in column M which of the following functions would be appropriate 5 When a conclusion about what can happen and with what likelihood follows a stated premise we move from the general to the specifing by using 6 The number of times a person uses public transportation during any given week is given by the probability distribution below a Probbailty 7 2 1 b Public transportation use 0 1 2 c The expected value of the random variable of X is equal to i ii 0 3 33 iii iv v 1 40 16 1 2 3 4 7 x 0 0 2 x 1 2 1 x 2 2 2 2 0 4 7 7 A data set with a CV level of 45 has small variability a True a True 8 According to the empirical rule 99 7 of the observations lie within three standard deviation of the mean regardless of the shape of the distribution a False b Only normal distributions bell shaped curves and not all distributions 9 The brand of a toaster is a nominal categorical variable 10 If an onward stat writer stands at the entrance to the football stadium on game day to ask students their opinion on an issue the writer is using what non random sampling method 11 The population of the number of service calls a utility company makes per day is 2 5 15 6 7 The mean and median respectively are 12 The units of a population MAD for a problem in which the units are dollars are a No units mad is a relative measure b Dollars c Dollars squared d The absolute value of dollars 13 Find the standard deviation of X for the following probability distribution a Stratified b Convenience c Self selected d Judgement e Systematic a 15 7 b 6 7 c 7 6 d 6 6 e 7 15 a X 20 40 60 b P X 5 25 25 i ii iii iv v 0 275 17 32 16 58 300 20 x 5 40 x 25 60 x 25 1 2 35 3 X 35 2 a 20 225 b 40 25 c 60 625 d 225 x 5 25 x 25 e f 25 x 625 g 275 h Root squared of 275 is 16 58 14 The number of times a streaming service has an outage during any given month is given by the probability distribution below a Outage X 0 1 2 b Probability P X 7 2 1 c The expected value of the random variable X is equal to 0 4 This number signifies i ii iii iv The 40th percentile of the probability distribution The long run average of the number of outages per month That there is a 40 percent change of at least one outage during any given month The most likely value of the random variable X 15 A sample of the number of refrigerators sold per day consisted of the values 10 10 10 2 The sample variance of this data set is equal to 4 16 The coefficient of variation computed from the three sample values 25 30 35 a False would be equal to 16 67 a True 17 If we want to randomly select every 70th person and we randomly select our starting point and from there sample every 0th person then the sample is what kind of random sample 18 An employees salary is a ratio scale variable a Systematic a True 19 A distribution can only be summarized with a measure of the cneter a False b Can be measured of center and spread 20 It is possible that the expected value of X in a discrete probability distribution may not be one of the values in the distribution 21 The number of sophomore students in a class is an example of quantitative data 22 The mean of a data set is a relative measure 23 Look on Exam which test score would you prefer a Score 1 only b Formula your score mean standard deviation 24 The relative frequency approach to assigning probabiltiies uses what has occurred in the past to predict the future a True a True a False a True 25 Data Analysis Is an excel add in a b Appears on the far left of the excel ribbon c Allows excel userts to do stat analysis in excel d Allows excel users to do statistical analysis in excel and excel add in 26 Assume that bread prices are equally likely to go up down or stay the same on any given day If the price at one grocery chain is independent and not affected by the price at a second grocery chain what is the probability that the prices of bread at the two grocery chains both move in opposite directions on any given dya 27 The number of appointments a bank president has per day is a continuous a 2 9 random variable a False b Discrete random variable not continuous 28 Given the following stem and leaf plot constructed from a set of observations a Look at questions really easy 29 A population of the number of people who ran stop signs contained the following data values 11 3 7 Find the population variance a 16 b 3 27 c 10 67 d 0 e 4 a 6 a False b Sample 30 Interest rates on four investment opportunities that a person is considering are 4 20 20 20 Find the mean absolute deviation 31 A statistics is a descriptive measure of a population 32 A random variable is said to be discrete if It can be represented graphically It can assume any real number within a given interval Its outcome are whole numbers or counts a b c d The rules of probability apply 33 Find the variance of X for the following probability distribution a X 5 10 15 b P X 4 4 2 i 14 34 An accounting firm …