Suppose ‘n’ people go to a party and leave their hats at the door. At
Suppose ‘n’ people go to a party and leave their hats at the door. At the end of the party, each person picksup a hat at random. Assume each assignment of hats to persons is equally likely. What is the expectednumber of people that get their own hats back?
Suppose that the amount of time (in months) that a light bulb lasts be
Suppose that the amount of time (in months) that a light bulb lasts before it burns out hasan exponential distribution with parameter ? = 1/4.a) What is the probability that it lasts at least three months?b) If it has already lasted two months, what is the probability that it will last at least threemore months?c) On average, how many months will the light bulb last?
What is the biosphere in a bay or water inlet that is contaminated by
What is the biosphere in a bay or water inlet that is contaminated by waste or trash? Name 2 biotic and abiotic environmental components involved in this issue and how their interaction affects the diversity of organisms in the water bay or inlet.
7. A population has a mean of 85 and SD of 9. If many samples of size
7. A population has a mean of 85 and SD of 9. If many samples of size n = 100 are randomly drawn from the population, approximately what proportion of the sample means fall between 84 and 86? Explain your answer and show work8. It has been extensively demonstrated that adequate night sleep is crucial for cognitive performance. To investigate whether first year USC students are getting adequate sleep the night before a final exam, 81 randomly selected first year USC students were asked to record their number of hours of sleep the night before their final exams. The mean number of hours of sleep among the 81 students was 6.2 with an SD of 1.5 hours. a. Identify the population, sample, and parameter of interest in this study.b. Construct a 95% CI for the mean number of hours first year USC students sleep the night before an exam. Explain the meaning of this CI (you are expected to explain what this confidence interval says about the parameter of interest)c. Now construct a 99% CI for the mean number of hours first year USC students sleep the night before an exam. Explain the meaning of this CI and contrast with the 95% CI in part b. d. Suppose the 81 students represent a subset of a larger pool of 100 students randomly selected for the study. The 81 students provided the investigators with their number of hours of sleep, while the remaining 19 students did not respond when contacted by the investigators. If the 19 non-responders were more likely to sleep more hours before an exam than a typical first year USC student, how would this affect the estimate and CI for the mean number of hours first year USC students sleep the night before an exam?
Player The dean of a university estimates that the mean number of clas
Player The dean of a university estimates that the mean number of classroom hours per week for full-time faculty is11. As a member of the student council, you want to test this claim. A random sample of the number of classroom hours for eight full-time faculty for one week is shown in the table below. At?equals=0.05, can you reject the dean’s claim? Assume the population is normally distributed.What is the P value? P=?
Problem Solving Interview Question Please respond to the following:R
Problem Solving Interview Question Please respond to the following:Respond to this typical interview question: Explain a specific example in which you utilized problem solving strategies to resolve a problem in the real world.Provide your feedback from the perspective of an interview coach to at least three (3) of your classmates.
Week 8 Discussion: Symbiosis between bacteria and other species. Some
Week 8 Discussion: Symbiosis between bacteria and other species. Some bacteria can harm other organisms. However relations between certain bacteria and particular species can be cooperative. That’s our topic for this discussion.Pick one of the following topics and write a primary post of at least 125 words addressing that topic. Also, please make a substantive reply to one of your fellow students.Discussion Question 1. Gearin (2016) describes cooperative relationships between different species of microscopic organisms called syntrophy. Answer the following two questions about this arrangement: (a) What are the main characteristics of their partnership? (b) How does each species benefit? Discussion Question 2. An article by Crandell (2012) describes the relationship between horses and the microscopic organisms that live in their cecum and colon. Answer the following two questions about this arrangement: (a) What are the main characteristics of the relationship between horses and their intestinal microbes? (b) What are the implications for keeping the horse healthy? Discussion Question 3. The Giant Tubeworm (Riftia pachyptila) is an animal which houses endosymbiotic bacteria in a special structure (Kusek, 2007; Deep Marine Scenes, 2013). Answer the following two questions about this arrangement: (a) What are the main characteristics of the relationship between a Giant Tubeworm and the bacteria it houses? (b) How does each species benefit? Discussion Question 4. In a 4 minute video clip (iBioEducation, 2013), Bonnie Bassler explains the relationship between the Hawaiian Bobtail squid and it’s endosymbiont, the bacterium Vibrio fisheri. Answer the following two questions about this arrangement: (a) What are the main characteristics of the partnership between these two species? (b) How do members of each species benefit? References:Crandell, K. (2012, January 3). Balancing the microbes in the horse’s digestive tract. Equinews. http://www.equinews.com/article/balancing-microbes-horses-digestive-tractDeep Marine Scenes. (2013). Facts: Giant tube worms. [Video]. Retrieved from https://www.youtube.com/watch?v=IddCPTnmj4QGearin, C. (2016, April 20). The search for superorganisms. Retrieved from http://www.pbs.org/wgbh/nova/next/evolution/superorganisms/iBioEducation (2013). Quorum sensing in bacteria – Bonnie Bassler. [Video clip]. Retrieved from https://www.youtube.com/watch?v=LebqwdQSFHEKusek, K. M. (2007, January 12). Deep-sea tubeworms get versatile ‘inside’ help. Oceanus Magazine. Retrieved from http://www.whoi.edu/oceanus/feature/deep-sea-tubeworms-get-versatile-inside-help
3.4 In triathlons, it is common for racers to be placed into age and g
3.4 In triathlons, it is common for racers to be placed into age and gender groups. Friends Leo and Mary both completed the Hermosa Beach Triathlon, where Leo competed in the Men, Ages 30 – 34 group while Mary competed in the Women, Ages 25 – 29 group. Leo completed the race in 1:22:28 (4948 seconds), while Mary completed the race in 1:31:53 (5513 seconds). Obviously Leo nished faster, but they are curious about how they did within their respective groups. Can you help them? Here is some information on the performanceof their groups: The finishing times of the Men, Ages 30 – 34 group has a mean of 4313 seconds with a standard deviation of 583 seconds. The finishing times of the Women, Ages 25 – 29 group has a mean of 5261 seconds with a standard deviation of 807 seconds. The distributions of finishing times for both groups are approximately Normal. Remember: a better performance corresponds to a faster finish.In Exercise 3.4 we saw two distributions for triathlon times: N(4313; 583) for Men, Ages 30 – 34 and N(5261; 807) for the Women, Ages 25- 29 group. Times are listed in seconds.a) the cutoff time for the fastest 5% of athletes in the men’s group, i.e. those who took the shortest 5% of time to finishb) the cutoff time for the slowest 10% of athletes in the women’s group
Writea 1,250- to 1,500-word paper that includes the following:Explain
Writea 1,250- to 1,500-word paper that includes the following:Explain the role of the nervous system.Describe the effect of fear, aggression, or anxiety on the specified behavior.Explain the function of the hormones involved and how they relate to the behavior.Describe the effects of regulatory impairments on the specified behavior.Write in 3rd personBe sure to include at least two references from scholarly (peer-reviewed) sourcesAPA format must be used
1. Which of the following traits may be acted on by natural selection?
1. Which of the following traits may be acted on by natural selection?enzyme activitybody shaperate of ontogenetic developmentinstinctual behaviorall of the above may be acted upon as long as they are controlled by genes 2. Which of the following is not capable of evolving?a population of asexually reproducing fruit flies a rose bush a population of fruit flies the collective feral cats of a city all the HIV in a single patient 3. Below are examples of changes that occur in life. Which one is an example of biological evolution?A cell starts to express a different set of genes when it is exposed to high levels of testosterone.Your taste in music changes dramatically between middle school and high school.A young man’s muscles increase in strength and bulk after he starts lifting weightsIn New York City, the average wing length of pigeons decreases over a period of 150 years.4. Population genetics is the study of ________.how allele frequencies in a population change over timepopulations of cells in an individualthe rate of population growthhow genes affect embryological development5. Which of the following variations could be subject to natural selection?A dog with short legs due to malnutrition is able to crawl into holes better than his litter matesA tree is not infested by a ground-dwelling beetle when the homeowner cuts the lower branchesA hyena is born with a spotted fur pattern that allows it to hide in the grass bettwe than his litter matesA pigeon learns than when its keeper comes near it will be fedAll of these variations may be acted on by natural selection7. _____________ is the primary pressure on species to change over time.natural section mutationadaptation10. Elephants travel long distances in search of food. Using vibrations felt in the ground, family members traveling separately can communicate with each other. Based on your knowledge of evolution, the ability to communicate over long distances probably developed ___________________________.slowly over millions of years by accident over ten year period as a strategy to decrease reproductionas a way to communicate with humans 11. Microevolution is to population as macroevolution is to __________.individuals communities biodiversity species 12. geographic isolation could result from a hurricane an ice age a fire all of the above 13. A group of 20 people decide to leave Brazil and settle on a deserted island in the Caribbean. There they form a new population isolated from contact with other human beings. This is an example of ______________.speciation gene flow genetic drift mutation14. Complete the following analogy: Microevolution is to population as macroevolution is to ______________.genes reproductionindividuals speciation15. microevolution is defined as changes in the frequency of alleles in the gene poolemergence of new species changes in population size changes in the composition of the populationchanges in community size 16. A food poisoning outbreak is traced to a new strain of Salmonella bacteria that has a highly potent version of the enterotoxin protein. This toxin is partially responsible for the vomiting and diarrhea associated with Salmonella food poisoning. This is an example of ______________.mutationgene flow genetic drift macroevolution17. What are the similarity of fish, frog, bird, and human embryos evidence of?analogy common ancestry genetic drift genetic mutation19. Consider Mendel’s pea plants in which a single gene determines whether the peas are yellow from the dominant allele Y or green from the recessive allele y (when both alleles are y). According to the Hardy-Weinberg Principle of Equilibrium, what is the frequency of heterozygous individuals in a population under low selective pressure?p + q =1 p2 2pq