Suppose, you want to know, if majority of the people prefer chocolate ice-cream over all others types. Find the minimum number of people you would need to survey, if you want to be 80% confident that the estimated (sample) proportion is within three percentage points of the true population? Assume that pq = 0.25 %3D

Q: A group of 100 people, who lived at varying distances (in kilometers) from an island nuclear power…

A: Given that there are 100 people. Therefore, the table becomes,    0-3 km distance 3-6 km distance…

Q: An epidemiologist is worried about the prevalence of the flu in East Vancouver and area. She will…

A: The smapleproprotion is caculated as: p = x/n=36/330 =0.1091   At a 95% confidence level, the z…

Q: Let p be the population proportion for the following condition. Find the point estimates for p and…

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Q: In quartiles Q_1 is represented as % of the that value till which data is covered. Select one: а. 75…

A:

Q: When an analytical chemist uses the word precision when referring to the data obtained from an…

A: Precision is the closeness of the measurements to each other, whereas accuracy is the closeness of…

Q: If you have a z-score of 4.00 and the body proportion is .99997 and the question is asking for the…

A: The z-score is given by 4.

Q: The registrar's office at ACC predicts that 30% of the 6,950 spaces open in various math classes…

A:

Q: A survey item administered at the end of a training program asked participants their opinion about…

A: The row and column totals for the given contingency table is, The degree of freedom is,

Q: Select the correct statement below   a) If the nineteenth percentile has a value of 0.8, this…

A: We know if X is pth  percentile value that means their are p percent values are less than X.

Q: A random sample of 120 adults showed that 42 are already fully vaccinated. What is the best point…

A: Given X:The no.of adults fully vaccinated X=42 n:Sample Size  n=120 We have to find best point…

Q: How large the sample size should be in order to be 98 percent confident, if the sample proportion is…

A: Given data, p=0.78 E=0.16 z-value at 98% confidence is Zc=2.326 n=?

Q: For a population with u = 30 and a = 4. Find the z-score that corresponds to an X value of 34.

A: From the provided information, Mean (µ) = 30 Standard deviation (σ) = 4 X~N (30, 4)

Q: The distribution of SAT scores is normally distributed with a μ = 500 and a σ = 100.  a, What…

A: Let X be a continuous random variable of the distribution of SAT scores  is normally​ distributed…

Q: If you obtained a test score of 78 on a test with an average test score of your class is 70, and SD…

A: Given, -x = 70 SD = 4 n = 36

Q: Let p be the population proportion for the following condition. Find the point estimates for p and…

A: Solution

Q: Suppose the true inverse demand relation for good X is Qdx = a + bPx + cM + e , and you estimated…

A:

Q: A population has µ = 50. Which value of o would make X = 55 an extreme value out in the tail of the…

A: Part 1: Given μ=50              To find for what value of σ, X=55 will be an extreme value In the…

Q: A sample with M=8 has EX=56. How many scores are in the sample?

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Q: Let p be the population proportion for the following condition. Find the point estimates for p and…

A: It is given that Sample size n = 1008 Number of adults who were not confident that the food they eat…

Q: d. How many member organizations need to be selected to have 95% confidence of estimating the…

A: d. A random sample of 100 member organizations is considered in which 40 members organizations have…

Q: Let x be the average number of employees in a group health insurance plan, and let y be the average…

A: The table with the necessary calculations is shown below: X Y X*Y X2 Y2   2 50 100 4 2500   8…

Q: Because of safety considerations, in May 2003 the Federal Aviation Administration (FAA) changed its…

A: Confidence interval : ( 180.024, 185.976) interpretation: b. We are 95% confident that the true…

Q: I dont have an example forthe problem question 22, so I am having trouble. Please help.

A: Introduction:Suppose a random variable X has mean μ and standard deviation σ.Let X = x be the cutoff…

Q: A researcher wishes to estimate the proportion of corporate executives whose annual salary is over…

A:

Q: For a population with m = 80 and s = 9, find the z-score for each of the following X values. (Note:…

A: Given Information: m = 80 and s = 9 Z-score is standardized value that specifies the exact location…

Q: 2- Given a x̅= 1, 000 and s= 100- you are taking a standardized test- what is the minimum score you…

A: According to empirical rule approximately 95% of observations lie within two standard deviation to…

Q: A researcher wishes to estimate the proportion of adult males who are less than 5 feet 5 inches…

A: It is given that margin of error (E) is 0.04 and the confidence level is 0.90.

Q: Is the given statement true or false? Justify your answer. If a police officer wants to find…

A: Claim Average speed of Motorists is 55 MPH Hypothesis Null Hypothesis: Ho: µ = 55 MPH Alternative…

Q: In a population with o= 4, a score of X= 48 corresponds to z = 1.50. The mean for this population is…

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Q: Two horses A and B were tested according to the time (in seconds) to run a particulat track with the…

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Q: A tax accountant would like to test the claim that the proportion of individuals who owe when filing…

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Q: For a sample of 12 offenders convicted of weapons violations, the length of prison sentence in…

A: to find mean valuemean = sum of observations/ count of observationsmean = (6 + 6 + 2 + 12 + 36 + 48…

Q: A sample of birth weights of 48 girls was taken. Below are the results (in g):

A:

Q: The weights of radish seeds are normally distributed, with µ = 0.12 g and σ = 0.02 g.    -What is…

A: Given data, µ = 0.12 g σ = 0.02 g

Q: To guarantee that cans of soup are properly filled, some cans are sampled and the amounts measured.…

A:

Q: If a constant c is added to each xi in a sample, yielding y; = x; + c, how do the sample mean and…

A: Note:-Since you have asked multiple questions, we will solve the first question for you. If you want…

Q: For a sample of 12 offenders convicted of weapons violations, the length of prison sentence in…

A: to find mean valuemean = sum of observations/ count of observationsmean = (6 + 6 + 2 + 12 + 36 + 48…

Q: What is the effective Bayesian estimate for 0 when you think of obtaining P(x|D) by substituting an…

A: Statistical inference interprets the probabilities based on relative frequencies is referred to as…

Q: How large a sample must she select if she desires to be 98% confident that the true mean is within 4…

A: HERE GIVEN , population standard deviation  = 6 ounces  confidence level = 98%  MOE  = 4

Q: Let p be the population proportion for the following condition. Find the point estimates for p and…

A:

Q: What is the minimum z-score that a data point could have in order to remain in the top 5%5% of a set…

A: P(Z>z0)=5%Using standard normal distribution table

Q: When X; only takes two values {0, 1}, what are the possible values of the estimates of p?

A: Solution : Given that , X1,X2,...........Xn be a random sample from population.Considering…

Q: When estimating the population proportion, how large a sample is needed to be 95% confident that the…

A: Here  sample proportion = 42/120= 0.35

Q: Insurance companies are interested in knowing the population proportion of drivers who always buckle…

A: From the EXCEL output, the critical value of z at the 95% confidence level is 1.96.

Q: Do the results support or contradict the common belief that the mean body temperature is 98.6°F? A.…

A: The mean is 97.82 and the median is 97.80.

Q: The head of a computer science department is interested in estimating the proportion of students…

A: Solution: From the given information, confidence level is 0.95, p=0.35 and E=0.10.

Q: For a set of observations, Q1 80 and Q3 = 130. %D Values greater than and less than are possible…

A: Solution

Q: You would like to be 99.9 confident that your estimate is within 2% of the true population…

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Q: The distribution of the weights of a sample of 1,400 cargo containers is symmetric and bell-shaped.…

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.