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Tag Archives: Population

A random sample of 25 statistics examinations was taken. the average score in the sample was 76 with a standard deviation of 12. assuming the scores are normally distributed, the 99% confidence interval for the population average examination score is:

Since the sample size is less than 30, therefore we use the t statistic. Let us define the given variables: N = sample size = 25 X = average score = 76 s = standard deviation = 12 99% Confidence interval Degrees of freedom = n – 1 = 24 …

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Which statement is true? A sample statistic can never be equal to the population parameter. Point estimates are defined for both samples and populations. To calculate a sample proportion, we need to know the population size. To calculate a point estimate, we need to know the sample size

Answer: Option C is true. To calculate a sample proportion, we need to know the population size. Step-by-step explanation: To calculate a sample proportion, we need to know the population size. – This is the true statement. A sample statistic can never be equal to the population parameter. This is …

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The percentage of the total population living below the poverty level is known as the A. income rate. B. poverty rate. C. poor rate. D. poverty measure.

The percentage of the total population living below the poverty level is known as the A. income rate. B. poverty rate. C. poor rate. D. poverty measure.

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Which technology is used on farms to increase food production for the growing human population

Answer: Genetic engineering. Explanation: Genetic engineering is a technology that involves recombinant DNA or RNA, through the genetic code, widely used by industrial agriculture. Through technology, the DNA of many plants has been modified so that crops are better protected against disease and pests, increase their resistance to unfavorable environmental …

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What price do farmers get for the peach crops? in the third week of June, a random sample of 40 farming regions gave a sample mean of $6.88 per basket. assume that the standard deviation is known to be $1.92 per basket. find a 90% confidence interval for the population mean price per basket that farmers in this region get for their peach crop

Given:Sample size, n = 40Sample mean, xb = $6.88Population std. deviation, σ = $1.92 (known)Confidence interval = 90% Assume normal distribution for the population.The confidence interval is(xb + 1.645*(σ/√n), xb – 1.645*(σ/√n)= (6.88 + (1.645*1.92)/√40, 6.88 – (1.645*1.92)/√40)= (7.38, 6.38) Answer: The 90% confidence interval is (7.38, 6.38)

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Consider college officials in admissions registration, counseling, financial aid campus ministry, food services, and so on. How much money do these people make each year? Suppose you read in your local newspaper that 45 officials in student services earn an average of $50,340 each year. Assume that the standard deviation is $10,780 for salaries of college officials and student services. Find a 90% confidence interval for the population mean salaries of such personnel. Round your answer to the nearest dollar and don;t forget to use the $ sign.

Since sample size is > 40, we use the z-score in calculating for the confidence interval. The formula is given as: Confidence Interval = X ± z * σ / sqrt (n) Where, X = mean = $50,340 z = z-score which is taken from standard distribution tables at 90% …

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Samples of size n = 90 are randomly selected from the population of numbers (0 through 9) produced by a random-number generator, and the variance is found for each sample. What is the distribution of the sample variances?

Answer: chi square distribution with df = n-1 Step-by-step explanation: Given that sample of size n=90  are randomly selected from the population of numbers (0 through 9) produced by a random-number generator Since sample size is large and randomness is followed we can assume that the variable follows a normal …

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In Texas, the population of a species of bats is decreasing at a rate of -0.121 per year. The population was 34,000 in 2000. According to the function; A(t) = A0e^(kt), what is the predicted population in 2015?

Answer: Population of bats in year 2015 is 5536. Step-by-step explanation: The given function A(t) = predicts the population of bats after t years. Here A(t) = population after ‘t’ years            k  = growth constant            t = time in years …

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Geographers rank human settlements based on what two factors? A. population and size by area B. size by area and impact/importance to the region C. population and impact/importance to the region D. population and growth rate **THE ANSWER IS C. POPULATION AND IMPACT/IMPORTANCE TO THE REGION**

Geographers rank human settlements based on what two factors? A. population and size by area B. size by area and impact/importance to the region C. population and impact/importance to the region D. population and growth rate **THE ANSWER IS C. POPULATION AND IMPACT/IMPORTANCE TO THE REGION**

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Which principle states that two species in the same habitat cannot have the same niche? niche exclusion principle competitive exclusion principle habitat exclusion principle population exclusion principle

Answer: competitive exclusion principle The competitive exclusion principle suggests that no two species can occupy the same ecological niche (functional role an organism performs in an ecosystem like type of food, and habitat chosen for living) in the ecosystem, the one which is stronger and superior over the other is …

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Which of the following is an example of microevolution? A caterpillar changes form into a butterfly. A population of birds slowly changes feather color from red to blue. A dinosaur species evolves over time into a bird species. A black cat has kittens with white spots.

Which of the following is an example of microevolution? A caterpillar changes form into a butterfly. A population of birds slowly changes feather color from red to blue. A dinosaur species evolves over time into a bird species. A black cat has kittens with white spots.

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What is a biological control for pest management? a. some members of the pest population are sterilized b. sexual attractants lure pest species to traps c. predators, parasites, or disease organisms are released to reduce pest populations d. harvested foods are exposed to ionizing radiation e. genetic engineering develops pest-resistant crops?

What is a biological control for pest management? a. some members of the pest population are sterilized b. sexual attractants lure pest species to traps c. predators, parasites, or disease organisms are released to reduce pest populations d. harvested foods are exposed to ionizing radiation e. genetic engineering develops pest-resistant …

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Which list correctly orders events in the rise and fall of apartheid in South Africa? i. Nelson Mandela became the nation’s president. ii. The Soweto Uprising sparked more protests. iii. Frederik W. de Klerk brought about reforms. iv. The Population Registration Act was signed. i. The Population Registration Act was signed. ii. Nelson Mandela became the nation’s president. iii. The Soweto Uprising sparked more protests. iv. Frederik W. de Klerk brought about reforms. i. The Population Registration Act was signed. ii. The Soweto Uprising sparked more protests. iii. Frederik W. de Klerk brought about reforms. iv. Nelson Mandela became the nation’s president. i. Frederik W. de Klerk brought about reforms. ii. Nelson Mandela became the nation’s president. iii. The Population Registration Act was signed. iv. The Soweto Uprising sparked more protests.

The Reformation actually started after Columbus’s landing in North America.  Treaty of Tordesillas in 1494 was forced on Spain and Portugal by the Pope. The Pope basically said that all lands in the New World belonged to Spain and all new non-Christian lands in the Eastern Hemisphere belong to Portugal. …

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Find the sample standard deviation and the population standard deviation of the data set. 70, 58, 70, 37, 58, 47, 58, 76, 77, 67, 66, 77, 33, 74, 57

Employee                                 Mary      Zoe         Greg         Ann           Tom Cumulative Pay                       …

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WILL GIVE BRAINIEST ANSWER ASAP 1. Africa’s population is growing very quickly. 2. Much of the best land in Africa is being used to grow cash crops, such as coffee, for export to other countries. 3. Droughts are common in Africa. Which of the following problems are the governments of Africa most likely to be concerned about as a result of the conditions above? A. increased risk of famine B. lower poverty rates C. higher education attendance D. lower rates of disease

Answer: The answer is C. In order to carefully control conditions and confirm or disconfirm a hypothesis about the causes of behavior, one must perform an experiment. Explanation: Experimental research allows the researcher to control all the variables in order to create the conditions that can confirm or disconfirm a …

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Which lines from Lincoln’s Second Inaugural Address appeal to pathos? Check all that apply. [A]ll thoughts were anxiously directed to an impending civil war. All dreaded it, all sought to avert it. One-eighth of the whole population were colored slaves, not distributed generally over the Union, but localized in the southern part of it. Neither anticipated that the cause of the conflict might cease with or even before the conflict itself should cease. Fondly do we hope, fervently do we pray, that this mighty scourge of war may speedily pass away. Neither party expected for the war the magnitude or the duration which it has already attained.

Since a tiny tender child of four,There’s nothing that I dreamt of more,Than to jump aboard a great big ship,A telescope, a map, a sword, by my hip,To feel the sea breeze in my hair,To stroke my parrot on the wood chair,To be bold and brave and happy as can be,To …

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A country’s population in 1992 was 72 million. In 1998 it was 76 million. Estimate the population in 2012 using the exponential growth formula. Round your answer to the nearest million.P=Ae^kt

You need to determine the number of ways in which 30 competitors from 50 can qualify. First, you have to realize that the order is irrelevant, that is: it is the same competitor_1, competitor _2, competitor _3 than competitor_3, competitor_2, competitor_1, or any combination of those three competitors. So, the …

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By 1850, 15 percent of the total U.S. population lived in cities. Please select the best answer from the choices provided T F

It is called SAFETY. According to Maslow’s hierarchy of needs (a motivational theory covering a five level model of human needs), humans need safety. It includes protection from elements, security, order, law, stability, freedom from fear. Safety needs is considered as basic needs along with the physiological needs. 

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By 1850, 15 percent of the total U.S. population lived in cities. Please select the best answer from the choices provided T F

It is called SAFETY. According to Maslow’s hierarchy of needs (a motivational theory covering a five level model of human needs), humans need safety. It includes protection from elements, security, order, law, stability, freedom from fear. Safety needs is considered as basic needs along with the physiological needs. 

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A math teacher wants to find out the average number of hours his students spend working on their math homework for his class each week. Which group would best represent a sample of the population? the first 30 students who enter the school building one morning 30 students selected from the lunchroom 30 students selected from his class rosters 30 students who stay after school for football practice

You need to determine the number of ways in which 30 competitors from 50 can qualify. First, you have to realize that the order is irrelevant, that is: it is the same competitor_1, competitor _2, competitor _3 than competitor_3, competitor_2, competitor_1, or any combination of those three competitors. So, the …

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