# Statistic exam | Mathematics homework help

The portion of the universe that has been selected for analysis is called:Answera samplea framea parametera statisticQuestion 2One of the advantages of a pie chart is that it clearly shows that the total of all the categories of the pie adds to 100%.AnswerTrueFalseQuestion 3Which of the 4 methods of data collection is involved when a person counts the number of cars passing designated location on the Los Angeles freeway system?Answerpublished sourcesexperimentationsurveyingobservationQuestion 4The coefficient of variation is a measure of the central tendency in the data.AnswerTrueFalseQuestion 5Which of the following is NOT a measure of central tendency?Answerthe arithmetic meanthe geometric meanthe modethe interquartile rangeQuestion 6A Pareto diagram is a bar chart in which the bars are naturally arranged with a decreasing pattern:AnswerTrueFalse-Question 7If two events are collectively exhaustive, what is the probabiltiy that one or the other occurs?Answer0.501.00Can not be determined with the information givenQuestion 8The cross-tabulation of two categorical variables leads to a contingency table:AnswerTrueFalseQuestion 9A business venture can result in the following outcomes (with their corresponding chance of occuring in parenthesis); Highly Successful (10%), Successful (25%), Break Even (25%), Disappointing (20%), and Highly Disappointing (?). If these are the only outcomes possible for the business venture, what is the chance that the business venture will be considered Highly Disappointing?4 pointsQuestion 10A population consists of all the possible objects to be studied:AnswerTrueFalse4 pointsQuestion 11An economics professor bases his final grade on homework, two midterm examinations, and a final examination. The homework counts 10% toward the final grade, while each midterm counts 25%. The remaining porttion consists of the final exam. If a student scored 95% in homework, 70% on the first midterm, 96% on the second midterm, and 72% on the final exam, his final average is 79.8%AnswerTrueFalse4 pointsQuestion 12If event A and Event B cannot occur at the same point in time, then events A and B are said to beAnswermutually exclusivestatistically independent collectively exhaustivenone of the above4 pointsQuestion 13Thirty-six of the staff of 80 teachers at a local intermediate school are certified in Cardio-Pulmonary Resuscitation (CPR). In 180 days of school, about how many days can we expect that the teacher on bus duty will likely be certified in CPRAnswer5 Days45 Days 65 days81 Days4 pointsQuestion 14If we randomly draw a ball from a bag with a finite number of balls in it, then put the ball back into the bag and randomly draw another ball from the bag, this is an example of sampling with replacementAnswerTrueFalse4 pointsQuestion 15The Standard Normal distribution has a mean of 1 and a standard deviation of 1.AnswerTrueFalse4 pointsQuestion 16Marginal probability is also calledAnswerSimple probabilityConditional probabilityJoint probabilityBayes’ theorem4 pointsQuestion 17If n = 10 and p = 0.70, then the standard deviation of the binomial distribution isAnswer0.071.45 7.00 14.294 pointsQuestion 18In its standardized form, the normal distributionAnswerhas a mean of 0 and a standard diviation of 1.has a mean of 1 and a variance of 0. has an area equal to .05cannot be used to aprroximate discrete probability distribution.4 points Question 19The “empirical rule” for the bell-shaped curve states that the percentage of data points falling within three standard deviations away from the mean is 99.7%AnswerTrueFalse4 pointsQuestion 20Distribution 1 is a skewed distribution and Distribution 2 is a symmetric distribution (not Normal distribution). Similar sample sizes will be required for the sample mean of random samples from the two distributions to have an approximate Normal distribution.AnswerTrueFalse4 pointsQuestion 21The null hypothesis Ho always contains an equal signAnswerTrueFalse4 pointsQuestion 22If we know that the length of time it takes a college student to find a parking spot in the library parking lot follows a normal distribution with a mean of 3.5 minutes and a standard deviation of 1 minute, find the probability that a randomly selected college student will find a parking spot in the library parking lot in less than 3 minutes.Answer0.3551 0.3085 0.26740.19154 pointsQuestion 23If we know that the length of time it takes a college student to find a parking spot in the library parking lot follows a normal distribution with a mean of 3.5 minutes and a standard deviation of 1 minute, find the point in the distiribution that 75.8% of the college students exceed when trying to find a parking spot in the library parling lot.Answer 2.8 minutes 3.2 minutes 3.4 minutes 4.2 minutes4 pointsQuestion 24The fact that the sample means are less variable than the population data can be observed form the standard error of the mean.AnswerTrueFalse4 pointsQuestion 25In left-skewed distribution, the median isAnswer equal to the meangreater than the meanless than the meannone of the above

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