What is the required sample size?

Q: n this scenario, what is the test statistic? A linguist believes the average age children learn a…

A: Given: n= 21.0 ,x̄= 9.2 ,s= 2.5 µ= 10.0 ,degree of freedom= 20.0

Q: Imagine that every elementary school in California is measured on several characteristics and then…

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Q: Imagine that every elementary school in California is measured on several characteristics and then…

A: For Carver:mean(μ)=10.1standard deviation(σ)=2.3and score (X)=13.2For Bryant:mean(μ)=9.8standard…

Q: Dr. Samwell Tarly wants to estimate the number of books checked out of the library in the past year.…

A: It is given that the mean is 10,000 and the standard deviation is 10.

Q: Suppose that the distribution of touchdowns (in football) is normally distributed with a mean of 250…

A: Consider that the mean and standard deviation of a random variable X are µ and σ, respectively.…

Q: A Seattle consumer agency believes that plumbers’ rates are too high and wants to estimate the mean…

A: GivenConfidence Interval(c)=95%Margin of Error(E)=3%=0.03Let…

Q: Please also explain why you determined whether or not the results are statistically significant.…

A: Given information isn1=40n2=40s1=0.50

Q: The sample standard deviation is one measure that describes the value in the sample that the data…

A: A single number that seeks to represent a set of data by identifying the center position within that…

Q: Test the above hypothesis is a random sample of 250 users has 210 successes. Solution: [Write…

A: As per policy I have calculated first question plz REPOST with note I need this question.  Null and…

Q: A randomly selected list of everyday food items was generated. Twenty-eight Grub Savers stores were…

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Q: Suppose that the average length of American songs is 245 seconds with a standard deviation of 28…

A: Solution: Let X be the length of American songs. From the given information, X has mean µ=245…

Q: How does the sample size affect the value of the mean and the standard deviation? Please elaborate.

A: Mean : The mean is the data's Centre point or typical value and summarizes a complete dataset with a…

Q: noat question Assuming a normal curve, find the highest Z score a person could have while being in…

A: Given that  A) P(Z < a) = 32% B) P(Z < b) = 6%

Q: The daily rates of a sample of eight employee at POL Corp. are $550, $420, $560, $500, $700, $670,…

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Q: An economist would like to estimate the mean amount of money that a family spends to within $45. If…

A: GivenMargin of Error(E)-45standard deviation(σ)=190α=1-0.93=0.07α2=0.035zα2=1.8119      (from z…

Q: A university dean wishes to estimate the average number of hours his part-time instructor teaches…

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Q: TRUE OR FALSE: A z-score indicates the number of standard deviations a data value is ab below the…

A: Standardized z-score: The standardized z-score represents the number of standard deviations the data…

Q: A company that makes baseball caps for babies is designing a new type of hat for toddlers. The new…

A: Here we are need to find the maximum and minimum head sizes for each new hat. Here each means we are…

Q: For 100 randomly selected adults, compute the mean and standard deviation?

A: A recent poll found that 47% of adults believe that the overall state of moral values is poor.Here…

Q: The Acme Company manufactures widgets. The distribution of widget eights is bell-shaped. The widget…

A: According to the given information in this question We need to answer two parts

Q: students has an average of 300 dollars and a standard deviation of 1,000. Suppose that we take a…

A: It is given that the random variable X i.e, the amount of money in savings accounts follow normal…

Q: ketch a bell curve for the ACT composite data with markings on the horizontal axis for ±1 standard…

A: here given , For the ACT, the mean composite score was 21.0 with a standard deviation of 5.2.

Q: A nursery sells trees of different types and heights. These trees average 50 inches in height with a…

A: The problem is asking us to find the standard deviation for the sample mean. In statistics, the…

Q: what does the mean and the standard deviation represent in data set? how would i interpret the…

A: Mean and standard deviation in data set:The mean represent the average value in a data set. In other…

Q: What is the relationship between the standard error of the mean and the sample size "n"?

A: The relationship between the standard error of the mean (SEM) and the sample size "n" is inverse.…

Q: The Acme Company manufactures widgets. The distribution of widget eights is bell-shaped. The widget…

A: Let X be the random variable from normal distribution with mean (μ) = 63 and standard deviation (σ)…

Q: the Empirical Rule. The mean speed of a sample of vehicles along a stretch of highway is 70 miles…

A:

Q: A researcher collected data on the palate length of 50 individual shrews of the same species.. She…

A: In this question, a researcher has collected data on the palate length of 50 individual shrews of…

Q: We wish to know the mean wait time that residents of Nova Scotia need to wait for surgical…

A: Given that  Sample mean =48.4 Population standard deviation =10.3 Margin of error= E= 0.9

Q: If the standard error,  of a sample data set is 5 and the standard deviation,  of the distribution…

A: For a population with mean µ  and standard deviation σ, the standard error is σx̅ = σ/√n, where x̅…

Q: The Sum of Squared Errors for a data set of 18 numbers is 64. What is the standard deviation?

A: Given thatThe sum of squared errors of data set (SS) = 64Number of data values in data set (n) =…

Q: Imagine that every elementary school in California is measured on several characteristics and then…

A: From the provided information, Mean (µ) and standard deviation (σ) of the school in Los Angeles…

Q: Explain in your own words how an understanding of the average deviation can provide a…

A: Average deviation providing steeping stone:

Q: Explain why we need to square the deviations from the mean in our calculation of the standard…

A: 3) The deviation formula is, Deviation=Xi-Mean In the formula Xi is individual scores.

Q: . Average annual expense of a middle-income household living in Afghanistan is 360,000 Afghani with…

A: Given, Mean μ = 360000Standard deviation σ = 4000sample size n = 1500

Q: I am lookin for the relationship between the sample mean and the population mean and also the…

A: An estimate mus be having few properties in the sense of best estimate.Unbiasdness is one the…