# Discussion: Which variable is discrete

Discussion: Which variable is discrete ORDER NOW FOR CUSTOMIZED AND ORIGINAL ESSAY PAPERS ON Discussion: Which variable is discrete QUESTION 1 Which variable is discrete? temperature at start of race time to finish a race number of runners in race length of race in kilometers QUESTION 2 Which best describes the distribution of the data in the line plot? uniform skewed left skewed right bell-shaped QUESTION 3 The frequency histogram shows the lengths of trails in a large park. How many trails are less than 18 kilometers long or at least 36 kilometers long? 24 21 15 10 QUESTION 4 A camping leader bought the items listed in the table for his team. What is the average cost of an item in his purchase? $6.60 $7.58 $5.44 $7.75 QUESTION 5 Which is the approximate standard deviation of the data set? {5, 12, 15, 10, 12, 6, 8, 8} 5.0 4.8 3.4 3.9 QUESTION 6 An art gallery has 11 vases. How many ways can 4 of the vases be arranged in the display window? 5040 330 7920 840 QUESTION 7 The table shows the different types of shoes available at a family shoe store. What is the probability that a randomly chosen womens shoe is a casual shoe? about 24.8% about 32.9% about 51.5% about 48.6% QUESTION 8 Fifty balls are numbered 150 and a red dot is painted on those balls that are a multiple of 6. The balls are mixed into a bag and one ball is randomly chosen. Discussion: Which variable is discrete What is the probability that the ball is numbered with a multiple of 10 or has a red dot? QUESTION 9 1. A bowl has 8 green grapes and 15 red grapes. Henry randomly chooses a grape, eats it, and then chooses another grape. What is the probability that both grapes are green? about 11.1% about 12.1% about 12.6% about 10.6% QUESTION 10 1. Determine the expected value of X. 5.45 5.95 4.8 4.6 QUESTION 11 1. Scores on a standardized test are normally distributed with a mean of 246 and a standard deviation of 22. Students who score at least 2.4 standard deviations above the mean receive a certificate. What is the minimum score required to receive the certificate? 272.0 294.0 310.4 298.8 QUESTION 12 1. The weights of books on a library shelf are normally distributed with a mean of 3.6 pounds and a standard deviation of 0.7 pound. Approximately what percent of the books weigh more than 4 pounds? 22% 37% 11% 28% QUESTION 13 1. Mrs. Fuller determines which four members of a population, labeled 0148, will be in a sample by starting at line 147. Which members are in the sample? 01, 24, 12, 33 11, 24, 01, 12 01, 12, 45, 18 20, 01, 12, 45 QUESTION 14 1. Jackie received 72% of the votes in an election. In a random sample of 40 eligible voters, 32 said they voted for Jackie. QUESTION 15 1. Study results indicate that the mean time to download a certain program to a personal computer is between 26.9 and 33.7 seconds. What is the studys margin of error? 3.4 s 7.4 s 6.8 s 3.7 s QUESTION 16 1. If movie theater tickets in a region have a mean cost of $8.32 and a standard deviation of $0.76, what is the approximate standard deviation of the sampling distribution of the mean for samples of size 30? $0.03 $0.14 $0.09 $0.28 QUESTION 17 1. In a random sample of 30 people who rode a roller coaster one day, the mean wait time is 46.7 minutes with a standard deviation of 9.2 minutes. Discussion: Which variable is discrete In a random sample of 50 people who rode a Ferris wheel the same day, the mean wait time is 13.3 minutes with a standard deviation of 1.9 minutes. Construct a 99% confidence interval for the difference between the mean wait times of everyone who rode both rides. (30.5, 36.3) (31.7, 35.1) (29.0, 37.8) (28.7, 38.1) QUESTION 18 1. In a simple random sample of 90 patients who saw a certain dentist, 8 patients had their teeth whitened. What is the 95% confidence interval for the percent of all the dentists patients who had their teeth whitened? (1.2, 16.6) (3.0, 14.8) (4.0, 13.8) (5.9, 11.9) QUESTION 19 1. Which phrase is the best description of the association between variables X and Y? weak negative association strong negative association strong positive association weak positive association 5 points QUESTION 20 1. Which is the best estimate of the residual when x = 3? 0.5 0.5 2.5 2.5 Get a 10 % discount on an order above $ 100 Use the following coupon code : NURSING10