two different options are under consideration for comparing the lifetimes of 3 brands of flashlight batteries, using 18 flashlights.a)one option is to randomly divide 18 flashlights into 3 groups of 6 flashlights each and than randomly assign each group to use a different brand of battery. would this statistical design be completely randomized design or a randomized block design? explainb) another option is to use 18 flashlights- 6 different brands of 3 flashlights each and randomly assign the 3 flashlights of each brand to use a different brand of battery. would this statistical design be completely randomized design or a randomized block design? explain

two different options are under consideration for comparing the lifetimes of 3 brands of flashlight batteries, using 18 flashlights.a)one option is to randomly divide 18 flashlights into 3 groups of 6 flashlights each and than randomly assign each group to use a different brand of battery. would this statistical design be completely randomized design or a randomized block design? explainb) another option is to use 18 flashlights- 6 different brands of 3 flashlights each and randomly assign the 3 flashlights of each brand to use a different brand of battery. would this statistical design be completely randomized design or a randomized block design? explain

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section11.4: Collecting Data

Problem 2E

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A pet food manufacturer runs an experiment to determine whether four types of cat treats are equallypreferred by cats. The manufacturer randomly selects 160 cats from a large city’s network of animal shelters.In the experiment, 160 cats are individually presented with four dishes, each containing a different type oftreat, and their choices are noted. Results show that 30 cats chose Type A, 43 chose Type B, 45 chose Type C,and 42 chose Type D. Do these data provide convincing statistical evidence at the 10% level that cats have preferences among typesof cat treats?
A small company is interested in determining how many of its employees are still paying off student loans. However, the company doesn't want to allocate the resources required to survey every single employee. So they decide to randomly sample 2 individuals from each department using a simple random sample approach. There are a total of 6 individuals that work in the human resources department. How many possible distinct combinations of 2 individuals could be selected from the human resources department?
A certain city divides naturally into ten district neighborhoods. How might a real estate appraiser select a sample of single-family homes that could be used as a basis for developing an equation to predict appraised value from characteristics such as age, size, number of bathrooms, distance to the nearest school, and so on? An appropriate method is to generate a simple random sample of all single-family homes in the city or a stratified random sample by taking a simple random sample from each of the ten district neighborhoods.An appropriate method is to sample the most expensive homes in a randomly selected district. An appropriate method is to randomly select which district to survey, and record data for each home in that district.An appropriate method is to sample the newest homes in all ten districts. Is the study enumerative or analytic? enumerativeanalytic
A car dealer is interested in comparing the average gas mileages of four different car models. The dealer believes that the average gas mileage of a particular car will vary depending on the person who is driving the car due to different driving styles. Because of this, he decides to use a randomized block design. He randomly selects five drivers and asks them to drive each of the cars. He then determines the average gas mileage for each car and each driver. Can the dealer conclude that there is a significant difference in average gas mileages of the four car models? The results of the study are as follows. Average Gas Mileage Driver Car A Car B Car C Car D Driver 1 2323 2222 2222 3434 Driver 2 3434 2929 2525 3737 Driver 3 3535 3232 2525 3737 Driver 4 3131 2121 3636 3636 Driver 5 3131 2727 2727 3535 Copy Data ANOVA Source of Variation SSSS dfdf MSMS Rows 120.7000120.7000 44 30.175030.1750 Columns 288.5500288.5500 33 96.183396.1833 Error 175.7000175.7000…
A car dealer is interested in comparing the average gas mileages of four different car models. The dealer believes that the average gas mileage of a particular car will vary depending on the person who is driving the car due to different driving styles. Because of this, he decides to use a randomized block design. He randomly selects five drivers and asks them to drive each of the cars. He then determines the average gas mileage for each car and each driver. Can the dealer conclude that there is a significant difference in average gas mileages of the four car models? The results of the study are as follows. Average Gas Mileage Driver Car A Car B Car C Car D Driver 1 3232 2222 3030 3939 Driver 2 2121 3939 3838 3737 Driver 3 2626 3131 3232 3939 Driver 4 3838 4040 2323 3434 Driver 5 3131 2929 2121 2222 Copy Data ANOVA Source of Variation SSSS dfdf MSMS Rows 174.2000174.2000 44 43.550043.5500 Columns 91.600091.6000 33 30.533330.5333 Error 607.4000607.4000 1212…
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To get answers to sensitive questions, we sometimesuse a method called the randomized response technique.Suppose, for instance, that we want to determine whatpercentage of the students at a large university smokemarijuana. We construct 20 flash cards, write “I smokemarijuana at least once a week” on 12 of the cards, where12 is an arbitrary choice, and “I do not smoke marijuana at least once a week” on the others. Then, we let each stu-dent (in the sample interviewed) select one of the 20 cards at random and respond “yes” or “no” without divulgingthe question. (a) Establish a relationship between P(Y), the probabil-ity that a student will give a “yes” response, and P(M), the probability that a student randomly selected at thatuniversity smokes marijuana at least once a week. (b) If 106 of 250 students answered “yes” under theseconditions, use the result of part (a) and 106 250 as an esti-mate of P(Y) to estimate P(M).
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A small transportation company with only five buses wants to evaluate four types of tires with respect to wear. Each of the buses runs a different route so that the terrain and driving conditions differ from bus to bus. To control the effect of the variable, a randomized block design is appropriate. Each bus constitute s a block, and each tire type constitutes a treatment. One tire of each type is placed on each bus, with the wheel positions being assigned randomly. The tires are run for 24,000 kilometers, after which, the tread wear is measured. The data obtained are given below: Are there significant differences in the average tread wear for the four types of tire? Use a .05 level of significance.Show complete solution (not excel or minitab)THANK YOU!