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NCSU MAE 206 - HW 1

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HW 11a. C1b. B1c. A1d. D2a. Population: All pieces of the tube Sample: 36 piecesof the tube used in the experiment.2b. This is an experiment. They are applying treatments tothe tubes in the form of oven temperature and size andare under direct control of the researcher.2c.A completely randomized design can be conducted asfollows: To cut each of the given 36 pieces of tube so wehave a small size group and a large size group.Then wewould conduct an experiment setting the temperature ofover at 3 different settings: 200F, 250F and 300F.Randomly assign each of the pieces of tube in both theGroups to undergo each of th 3 temperature settings.Measure the durability of each tube. Tabulate the entireresults of the experiment:the durability of tube for variousconditions. Statistical Hypothesis Test is conducted inorder to study the effect of size of tubing and thetemperature on the durability of tubing.2d. Randomization is important in the above experiment totake into account the variation of cut tubing from piece topiece natural variation of the inherent properties whichmay affect its durability, thus controlling the possibleconfounding variable.3a.Factors: 4 diet types (A,B,C, & D) Treatments:Combinations of the 4 diet types (A,B,C, & D) ResponseVariable: Weight of baby chickens3b. There are 6 replicates in this study (48/(2*4))=63c. Replication is important in a study because it allowsthe researcher to estimate the inherent variability in thedata.3d. This study uses blocking by grouping together chicksof the same species and diet type. The chicks are then feda certain diet type.3e. The 2 sources of variability are the growth rate of theindividual chicks as well as how hungry the chicks are.3f.4 sources of experimental error could be lurkingvariables in the form of allergies, initial weight, feedingtime, and birth defects.4a. Simple random sampling was used.4b. The time frozen and toppings used are the factorswhile covarities could be oven temperature dough andsauce type and expiration.4c. Topping is the variable that we can control for, we wantto control for this variable to see how review on qualitychange based on which topping is

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