List three different types of heat transfer and discuss their differ.pdf

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List three different types of heat transfer and discuss their differences Solution there are three types of heat transfer : 1) conduction 2) convection 3) radiation Difference: CONDUCTION: Conduction is heat transfer between part of the same material or different material which are adjacent to one another.Conduction is the transfer of heat through vibration and collision of neighbouring particles. (This mostly occurs only in solids as the particles are very close to one another. Conduction does not work well in liquids and gases due to the particles being far away from another.) CONVECTION: Convection is heat transfer from one material to another via a medium, such as air or water. Convection occurs only in liquids and gased. In mediums where it is possible for particles to move from one place to another. RADIATION: Radiation is a method of heat transfer that does not rely upon any contact between the heat source and the heated object as is the case with conduction and convection. Heat can be transmitted though empty space by thermal radiation often called infrared radiation. Radiation occurs almost at every instant. It does not require a medium and it\'s effficiency is based on the texture of the recieving surface. Radiation is an electromagnetic way i. g the way we get heated from sun..

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Lyme disease is spread in the northeastern United States by infected ticks. The ticks are infected mainly by feeding on mice, so more mice result in more infected ticks. The mouse population in turn rises and falls with the abundance of acorns, their favored food. Experimenters studied two similar forest areas in a year when the acorn crop failed. They added hundreds of thousands of acorns to one area to imitate an abundant acorn crop, while leaving the other area untouched. The next spring, 55 of the 76 mice trapped in the first area were in breeding condition, versus 11 of the 14 mice trapped in the second area.. Give a 91% confidence interval for the difference between the proportions of mice ready to breed in good acorn years and bad acorn years (callp1the proportion ready to breed where acorns were plentiful and report the interval to ±0.001): Solution The sampling distribution of The mean of is The variance of is Therefore, the standard deviation of is Confidence interval for Conditions: 1. both sample proportions should be of separate SRSâ€™s from two different 2. both populations should be at least 10 times the sample size given all have to be five or more 12.23 Lyme Disease p. 706 Lyme disease is spread in the northeastern United States by infected ticks. The ticks are infected mainly by feeding on mice, so more mice result in more infected ticks. The mouse population in turn rises and falls with the abundance of acorns, their favorite food. Experimenters studied two similar forest areas in a year when the acorn crop failed. They added hundreds of thousands of acorns to one area to initiate an abundant acorn crop while leaving the other area untouched. The next spring 54 of the 72 mice trapped in the first area were in breeding condition versus 10 of the 17 mice trapped in the second area. Give a 90% confidence interval for the difference between the proportion of mice ready to breed in good acorn years and bad acorn years. Before you start your steps, write down both sample proportions and sample sizes Step 1: We want to estimate , the difference between the mice ready to breed in good acorn years and bad acorn years. Step 2: We will use a two sample proportion interval. · SRS? We are not told that our two samples are of SRSs from either population therefore we may not be able to generalize to the whole population proportion difference. · The population of all mice is at least 10(72) and 10(17) These are all at least 5, therefore we can use normal approximation. Step 3: From our TI 83/84 calculator using the two proportion z test command, a 90% CI for is (-0.05, 0.38) Step 4: We are 90% confident that the true proportion difference between the mice ready to breed in good acorn years and bad acorn years is between -0.05 and 0.38. Significance Tests for To test the hypothesis First, find the POOLED proportion of successes in both samples combined. IMPORTANT: We only POOL for two proportion significance tests AND your calculator does i.

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