Suppose that 2% of a population carries antibodies to a virus. For a research project, you need 8 people with antibodies to the virus. How many people must you test to be 95% certain of getting at least 8 people with the antibodies? This problem will need some trial and error...you are trying to find n so that P(X > 8) = 0.95.

Q: A sample of n = 9 scores has a mean of M = 20. One of the scores is changed and the new mean is…

A: The formula of the mean : Mean= sum of observationsnumber of observationssum of observations = meanM…

Q: A sample has a mean of 30 and s=8 would a score of x=36 be considered a central score or an extreme…

A: The z-score for x=36 when mean of 30 and standard deviation of 8 is, z=x-Means=36-308=68=0.75 It is…

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: 9. A population has a mean of M= 4 and EX= 48. How many scores are in this population?

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Q: In a one-tail test, the p-value is found to be equal to 0.0026. If the test had been two-tailed, the…

A:

Q: A sample of n = 4 scores has a mean of x̅ = 40, with a sum of squares of SS = 48. What is the…

A: Given that n=4, x̅ = 40 and SS=48 Consider, the variance, s2=SSn-1=484-1=16

Q: Workers at a large toxic cleanup project are concerned that their white blood cell counts may have…

A:

Q: A company claims that the number of defective items manufactured during each run of making 100 of…

A: Given  that,  Sample size is n= 100 And probability of detective is p= 0.03  So X~ Binomial…

Q: A sample of n = 9 individuals is selected from a population with μ = 60 and σ = 6, and a treatment…

A: The provided information is:

Q: Find the z-score corresponding to a score of X = 45 μ = 40 and σ = 20 μ = 40 and σ =10 μ = 40 and σ…

A:

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: For each of the following, assume that the sample was selected from a population with u = 72 and o =…

A: As per our guidelines, we are allowed to answer three sub-parts only. Please post other sub parts…

Q: An independent-measures study is analyzed using the appropriate t-test, and the APA summary is t(56)…

A: Given: t(56) = 3.19, p < .01, d = 0.32

Q: n H.w2: A civil service examination was given to 200 people. On the basis of their total scores,…

A:

Q: A sample of n=25 scores has a mean of M=68. Find the z-score for this sample: If it was obtained…

A: It is given that M = 68 and n =25.

Q: q17- In a one-tail test, the p-value is found to be equal to 0.0039. If the test had been…

A:

Q: For any population of scores, E(X – µ)² will always equal zero.

A: The sum of deviations is 0 for all population values around the mean, i.s.  if  μ=∑X/N, then  ∑(X-μ)…

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

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Q: Find the z-score corresponding to a score of X = 30 for each of the following: µ =50 and σ = 20 µ…

A: The formula for finding the z score is shown below:

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

A: Given data,μ=80σ=9

Q: . A population with a mean of 10 has EX 250.How many scores are in the population?

A: Note: Hey there! Thank you for posting the question. For calculating number of scores in the…

Q: A researcher conducts a hypothesis test using a sample from an unknown population. If df = 30 for…

A: The degrees of freedom is given as 30.

Q: For a population with µ = 84 and σ = 4, what is the z-score corresponding to X = 80?       a. +1.25…

A: Given ,  μ=84  σ=4  x=80

Q: The claim is that the proportion of adults who smoked a cigarette in the past week is less than…

A: It is given that n is 1,817 and x is 400.

Q: Throughout the problem we assume that p, and with it ˆp, is constant. a) What effect has an increase…

A: According to the provided information,  p, and with it ˆp, is constant.

Q: a. at 95% level of confidence, is there enough evidence to day that there will be no sales for a…

A: Given Information: Consider the data that shows the sample of ads budget and sales per week.

Q: In a Harris survey, adults were asked how often they typically travel on commercial flights, and it…

A: Given P(N)=0.33

Q: for a population with a µ = 60 and σ = 12 Find the z-score for an x value of 75

A: The mean is 60 and the standard deviation is 12.

Q: For a population with u =80 and 0 = 12, what is the z-score corresponding to x = 92?

A:

Q: A sample is selected from a population with μ = 50 and σ = 12. If the sample mean of M = 56 produces…

A: Determine the number of scores in the sample.   The number of scores in the sample is obtained below…

Q: The proportion of people who relapse at twelve months posttreatment for heroin addiction is 0.75.is…

A: From the provided information, Population proportion (p) = 0.75 Sample size (n) = 50 Confidence…

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

A:

Q: An individual is selected from a normal population with a of μ = 80 with σ= 20, and a treatment is…

A: It is given that the mean is 80 and the standard deviation is 20.

Q: For a population with P = 60 and ° = 12, find the z-score corresponding the following X values: X =…

A: We have to find z score.

Q: A sample of n=4 scores is selected from a population with u=50 & ó=12. If the sample mean is M=56…

A: Given ,mean(μ)=50standard deviation (σ)=12sample size (n)=4sample mean (M)=56

Q: A sample of n = 25 scores has a mean of M = 68. Find the z-score for the sample: If it was obtained…

A: Given that, M=68,μ=60,σ=10,n=25 The z-score for the sample is, Hence, the z-score for the sample…

Q: A sample of n = 36 scores is selected from a normal population with µ = 75 and σ = 7. The…

A: The sample size is 36, population mean is 75 and population standard deviation is 7.

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: For a population with μ = 60 and σ  = 8, the X value corresponding to z = -0.50 would be?

A: Given:  μ =60 σ =8  z = -0.50

Q: for a population with μ = 60 and σ = 8, the X value corresponding to z = 1.50 would…

A:

Q: %3D A population of N= 5 scores has EX= 20 and EX² = 100. For this population, what is the value of…

A: Given information- Population size, N = 5 ⅀X = 20 ⅀X2 = 100 We have to find the sum of squares (SS)

Q: a researcher conducts a hypothesis test using a sample from an unknown population. if the t…

A:

Q: A sample of n=25 scores has a mean of M=68. Find the z-score for this sample: if it was obtained…

A: Sample size = 25 Sample mean = 68 Mean = 60 Standard deviation = 10

Q: For a population with μ =100 and σ = 20, what is the X value corresponding to z = -0.50?

A:

Q: 3. For a population with H = 60 and O = 12, find the z-score corresponding the following X values: X…

A: Given that, Mean = 60 Standard deviation = 12

Q: 9. A population has a mean of u = 80 with o= 20. a. If a single score is randomly selected from this…

A: Given :  A population has a mean of μ = 80 and a standard deviation of σ = 20.   Sampling…

Q: A sample of n = 64 scores has a mean of M = 68. Assuming that the population mean is μ = 60, find…

A: Z-score: The z-score is a score expressed in terms of hypothetical standard normal distribution with…

Q: At a local university, English instructors are supposed to grade essays in a class so that the…

A: Note: Hey, since there are multiple questions posted, we will answer first question. If you want any…

Q: For a normally distributed population with a mean of 50 and a SD of 10, we would expect 95% of the…

A:

Q: For a population with μ = 50 and σ = 18, the distribution of sample means based on n = 9 will have a…

A:

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.