­¦ý°±·>œ 13œ0Ï€¡Å` •ø3jbjb $$|c|c3 àhhhhhhh½ ½‡"444444444666666,þR1Ãbh44444b4hh44w4444h4h444|$Ýhhhh4444hh4( îJ3¬444ç0‡4›4›44h½½§\ §½½\ Below the second challenge, our *FIRST* "for real" post. E-Mail coordinators, please make sure your teams have NTP's (Net Team Partners) and exchange information and disscuss *HOW TO* solve the challenges. Good Luck MrH ******************************** Level 7-9 ******************************** Free sample... Statistics deals with making predictions and conclusions about a population based on a sample taken from the population. An example of a population might be all the students currently attending your school. A sample from this population would be the students that are only in your class. This is a subgroup of the entire group. However, this example is NOT an example of a RANDOM sample, because the sample of students was determined by a systematic method-namely by class. 1) What is the meaning of the word "random?" Is it possible to select a sample by completely random methods? Explain. 2) Explain how you might randomly (or as random as possible) select a sample of 50 students from a population of 430 students. After a sample has been selected from a population, a number of statistics can be computed. These statistics can be used to make inferences about the population based on the sample. 3) What is an inference? Statistics fall into 2 main groups--central tendency (mean, median, mode), and spread (range, variance). 4) Find the mean, median, mode, and range of the sample below: 4, 8, 3, 9, 7, 6, 7, 5 Do you think it is possible that this sample came from a population whose mean is: A) 8.2--Explain. B) 25.5--Explain. 5) Manufacturers use statistics to monitor their equipments' accuracy and precision. Suppose a softdrink manufacturer bottles soda in 16 oz bottles. A) Do you expect every bottle to contain exactly 16 oz of soda?--Explain. Would you be terribly surprised if a bottle contained less than 16 oz? B) Suppose a random sample of 20 bottles is taken. What do you think the mean of this sample would be? If the mean of the sample were 15.9 oz. Do you think the manufacturer's machine is working properly?-- Explain. Now if just 1 bottle is sampled and has a measure of 15.9 oz, do you think the manufacturer's filling machine is working properly?-- Explain. 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