MATH 225N Week 3 Central Tendancy Question and Answers (Assured Grade A)

Given the following box-and-whisker plot, decide if the data is skewed or symmetrical. Which of the following frequency tables show a skewed data set? Select all answers that apply. Which of the following frequency tables show a skewed data set? Select all answers that apply. Which of the following frequency tables shows a skewed data set? Select all answers that apply. For the following dataset, you are interested to determine the “spread” of the data……Would you employ calculations for the sample standard deviation, or population standard deviation for this data set: Ages of all students in a Statistics course with an enrollment of 30 students. Which of the data sets represented by the following histograms has the smallest standard deviation? A company is interested to know the variation in … yearly sales amount for all 5 salespeople in the company. Which of the data sets represented by the following histograms has the smallest standard deviation? The data set shown below is the … sales amount sold by the 5 salespeople in the company (expressed in thousands of dollars): 40,60,65,70,80 ….. Find the variance for this dataset. The data below are the monthly average high temperatures for November, December, January, and February in New York City from the Country Studies/Area Handbook Series sponsored by the U.S. Department of the Army between 1986 and 1998. What is the sample standard deviation? …..54,42,40,40…….Round the final answer to one decimal place. The following data values represent the daily amount spent by a family during a 7 day summer vacation. Find the sample standard deviation of this … dataset: $96, $125, $80, $110, $75, $100, $121…. Round the final answer to one decimal place. Which of the following lists of data has the smallest standard deviation? Which of the following lists of data has the smallest standard deviation? Find the median of the following set of miles per gallon for randomly selected sports cars…..36,22,24,30,44,13,21,34,18 Find the mode of the following number of times each machine in a car factory needed to be fixed within the last year…..2,5,6,12,14,12,6,2,5,3,14,5 Laura runs at the park after school and wants to know the mean number of miles she runs. The numbers for the … miles run each day so far are listed below……8,9,7,13,3,9,14…….Find the mean number of miles she runs daily. An art collector bought 20paintings at an art fair, and wants to know the average price of her new paintings. She adds the prices of all the paintings and divides this number by 20 to find an average price of $350 . Is this price a sample mean or a population mean, and which symbol would be used to denote it? Given the following list of the … number of pens randomly selected students purchased in the last semester, find the median…..13,7,8,37,32,19,17,32,12,26 Find the mode of the following amounts of exercise (in hours) randomly selected runners completed during a weekend……2,14,14,4,2,4,1,14,4,4,8 Find the mode of the following list of points earned on a 16 point quiz given during a finance class. 7,7,3,2,7,16,12,16,12 Find the median of the following set of data. 35,43,18,35,29,27,19,19…….Give your answer as a number only. For example, if you found the median was 34, you would enter 34. Each person in a group shuffles a deck of cards and keeps selecting a card until an ace appears. Find the mode of the following number of cards drawn from a deck until an ace appears. 14,10,7,14,9,9,10,12,9,7,12 A grandfather wants to know the average height of all his grandchildren. He finds that the heights of his 9grandchildren are given in inches by…63,71,60,59,74,60,60,75,58. What is the population mean of the height of his grandchildren in inches? Round your answer to the nearest tenth of an inch and do not include units. Given the following list of the number of pencils randomly selected students used in a school year, find the median…..10,22,6,7,19,5,27 A teacher randomly selects 10out of her 30 students and finds that the mean height of those 10 students is 5′2″. Is this a sample mean or a population mean, and which symbol would be used to denote it?