more than 3 or leave it for whoever is willing to do them. thank
you so much highly appreciated
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more than 3 or leave it for whoever is willing to do them. thank
you so much highly appreciated
Assume you are employed by a consumer-products rating service and your assignment is to assess car batteries. For this part of your investigation, you want to determine whether there is a difference in useful life among the top-of-the-line car batteries produced by three manufacturers (A, B, and C). To provide the database for your assessment, you randomly sample four batteries from each manufacturer and run them through laboratory tests that allow you to determine the useful life of each battery. The following are the results given in months of useful battery life: Battery Manufacturer A B с 58 44 44 59 50 52 56 50 52 60 49 52 (a) Use the analysis of variance with a = 0.05 to determine whether there is a difference among these three brands of batteries. (i) Fill in the missing values. Source SS df s2 Fobt Between Within Total (ii) What is the value of Fcrit? Fcrit =
An instructor is teaching three sections of Introductory Psychology, each section covering the same material. She has made up a different final exam for each section, but she suspects that one of the versions is more difficult than the other two. She decides to conduct an experiment to evaluate the difficulty of the exams. During the review period, just before finals, she randomly selects five volunteers from each class. Class 1 volunteers are given version 1 of the exam; class 2 volunteers get version 2, and class 3 volunteers receive version 3. Of course, all volunteers are sworn not to reveal any of the exam questions, and also, of course, all of the volunteers will receive a different final exam from the one they took in the experiment. The following are the results. Exam Version 1 Exam Version 2 Exam Version 3 71 93 85 88 78 72 84 80 84 79 86 92 74 72 79 Using a = 0.05, what do you conclude? (a) Fill in the missing values. Source SS df 2 Fobt Between Within Total (b) What is the value of Fcrit? Fcrit =
For the following problem, assume normality in the population. The director of human resources at a large company is considering hiring part-time employees to fill jobs previously staffed with full-time workers. However, he wonders if doing so will affect productivity. Therefore, he conducts an experiment to evaluate the idea before implementing it factory-wide. Six full-time job openings, from the parts manufacturing division of the company, are each filled with two employees hired to work half-time. The output these six half-time pairs is compared with the output of a randomly selected sample of six full-time employees from the same division. Note that all employees in the experiment are engaged in manufacturing the same parts. The average number of parts produced per day by the half-time pairs and full-time workers is shown here: Parts Produced per Day Half-time pairs Full-time workers 24 19 28 30 46 38 34 35 30 37 32 Does the hiring of part-time workers affect productivity? Use a = 0.052 tail in making your decision. tobt = 0.6 X tcrit = + 2.3 X
An educator wants to determine whether early exposure to school will affect IQ. He enlists the aid of the parents of 12 pairs of preschool- age identical twins who agree to let their twins participate in this experiment. One member of each twin pair is enrolled in preschool for 2 years while the other member of each pair remains at home. At the end of the 2 years, the IQs of all the children are measured. The results follow. IQ Twins at preschool 108 Twins at home Pair 1 116 2 121 115 3 107 100 4 117 115 5 114 119 6 115 108 7 131 123 8 119 113 9 114 109 10 123 122 11 117 116 12 106 104 Does early exposure to school affect IQ? Use a = 0.052 tail. tobt = 1.9 X tcrit = + 2.0 X
A physics instructor believes that natural lighting in classrooms improves student learning. He conducts an experiment in which he teaches the same physics unit to two groups of seven randomly assigned students in each group. Everything is similar for the groups, except that one of the groups receives the instruction in a classroom that admits a lot of natural light in addition to the incandescent lighting while the other uses a classroom with only incandescent lighting. At the end of the unit, both groups are given the same end-of-unit exam. There are 20 possible points on the exam; the higher the score, the better the performance. The following scores are obtained. Natural Plus Incandescent Lighting Incandescent Lighting Only 18 16 15 20 14 14 19 15 14 14 18 16 17 14 Using a = 0.052 tail, what do you conclude? tobt = 0.69 x tcrit = + 2.17 x