Residuals

Q: explain Representativeness and Probability of Selection?

A: A bunch of citizens who represents the country is stated as a nationally representative sample. 

Q: Question Two The following table gives the experience (in years) and the number of computers sold du...

A: We have given that the table gives the experience i.e. X and the number of computers sold i.e. Y dur...

Q: In a researcher’s normal distribution, 35% of the area under the curve is to the right of the score ...

A: Note: Hi there! Thank you for posting the question. As there are several independent questions, acco...

Q: In a study of cell phone use and brain hemispheric​ dominance, an Internet survey was​ e-mailed to 2...

A: Here X = 1095 N = 2482 and we want to construct 90% confidence interval.

Q: A Wendy’s manager performed a study to determine a probability distribution for the number of people...

A: The table shows the probability distribution for the number of people.

Q: Statistics Question

A: (a)   Use EXCEL to obtain the regression equation.   EXCEL procedure:   Go to EXCEL Go to Data>D...

Q: Define a confidence interval or margin of error and discuss the impact of sample size at it relatest...

A: Let's define true population mean CI for a sample of size n (n<30) x¯±tsnwhere s=sample standard ...

Q: Scores on the Math Achievement Test form a normal distribution with a mean of μ = 300 and σ = 100. A...

A: Given: Population mean μ=300 Population standard deviation σ=100 Let X ~ N (300, 1002) Let a be the ...

Q: Find the critical value zα/2 that corresponds to the confidence level 90​%.     QUESTION** zα/2 = ?

A: Here we need to find the z value corresponding to the 90% confidence interval.

Q: Grace Floral Shop claims that their average daily earnings is $497. An auditor wants to determine wh...

A: Given Information : Grace Floral Shop claims that their average daily earnings is $497. An auditor w...

Q: Consider a marketer who develops a simple regression model to explain the costs of flighting (Y) by ...

A: 1. 95% confidence interval for β1: Excel Procedure: Enter X and Y in Excel>Data>Data Analysis&...

Q: In the following problem, check that it is appropriate to use the normal approximation to the binomi...

A: It is given that p = 0.83 and n =67.

Q: The u for days absent from class per month is 4.3. The teacher begins a policy of pop quizzes to see...

A: Null and alternative hypotheses: The hypothesis which is tentatively fixed up under and tested for t...

Q: For a sample of n = 25 pairs of scores, what is the critical value for a Pearson's correlation using...

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Q: Help

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Q: A food safety guideline is that the mercury in fish should be below 1 part per million (ppm). Listed...

A: From the provided information, Sample size (n) = 7

Q:

A: Given: n = 30 Formula Used: Mean = ∑F·Xn Sample standard deviation = ∑F·X2-nX2n-1

Q: 2. The horizontal lỉne test can be used to determine if a relation is a function. 3. A relation is a...

A: Given statement is true. 

Q: Emotional Quotient (EQ) score on the latest version of Sirug EQ Test are transformed so as to follow...

A: Given, Mean is 110 standard deviation is 15 a) 35th percentile for EQ is calculated as follows: The ...

Q: The following data lists the ages of a random selection of actresses when they won an award in the c...

A: Given information: The data representing the ages of a random selection of actresses and actors when...

Q: Do you take the free samples offered in supermarkets? About 62% of all customers will take free samp...

A: Given information: The number of customers included in the sample, n = 315. The probability that a r...

Q: Suppose x has a distribution with ? = 15 and ? = 9.

A: a) The following information about the mean and standard deviation has been provided: μ=15, σ=9, n=3...

Q: 1. According to the AAA Foundation for Traffic Safety’s American Driving Survey, U.S. driversspend, ...

A: Introduction: The population mean is to be compared with a suggested value here, when the population...

Q: In the following problem, check that it is appropriate to use the normal approximation to the binomi...

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Q: Determine the area under the standard normal curve that lies between Z=-1.95 and Z=1.95 Z= 0.49 and ...

A: Given information: The z-scores are provided as: Z=-1.95 and Z=1.95 Z= 0.49 and Z=0 Z=-2.17 and Z=1....

Q: Please find standard deviation

A: Standard deviation: The positive square root of mean squares of the deviation taken from the arithme...

Q: answer p[art b please list z score  an the intervals like mean and standard devation. test stastic  ...

A: We have given that the sample mean 1.627 and sample standard deviation s = 1.320 and sample size n =...

Q: Assume that 12 jurors are randomly selected from a population in which 76% of the people are Mexican...

A: We have to find given probabaility

Q: In the criminal justice system, a defendant is innocent until proven guilty. Therefore, the null hyp...

A: a. Type I error: The type I error is the rejection of the null hypothesis when it is actually true. ...

Q: 8. If you are taking a random sample from a normal population with = 100 and  = 16, which of the fol...

A: the PDF of normal distribution is = 1/σ * √2π * e ^ -(x-u)^2/ 2σ^2standard normal distribution is a ...

Q: Given the following table, complete the table and write the function rule.

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Q: On average, a milk packaging machine fills milk into 500 milliliter-packages. Sometimes, the machine...

A: From the provided information, Mean (µ) = 500 Variance (σ2) = 100 Standard deviation (σ) = 10 X~N (5...

Q: 9). A factory produces 10,000 items in one week, and 50 of those items are defective. Out of the 50 ...

A: Given: Below is the contingency table with the details given   Defective non defective Total Ma...

Q: The following letter appeared in the popular “Dear Abby” newspaper advice column in the 1970s: Dear ...

A:

Q: A quick survey of peanut butter prices had standard deviation and mean of $0.26 and $3.68, respectiv...

A: Given mean = 3.68 standard deviation = 0.26 let the cost be X to find P(X>4.25)  

Q: An assembly line at a plant produces exactly 10000 widgets a day. Suppose that approximately1 out of...

A: From the provided information, Sample size (n) = 10000 1 out of every 2000 fails a standard test and...

Q: Find the following probabilities. You MUST draw, label, and shade a curve for each one. Use the tabl...

A: a) The probability of the area to the left of z=-0.97 and to the right of z=0.97 is obtained as give...

Q: Please do 4 and 5

A:   Hello! As you have posted 2 different questions, we are answering the first question. In case you ...

Q: 3.Which model do you think is the “best” reduced model? Discuss why you choose this model. Analysis ...

A: It is an important part of statistics. It is widely used. 

Q: Q. 5 Once a fire is reported to a fire insurance company, the company makes an initial estimate, X, ...

A: i) To show that it is a probability density function, the below integral should hold,  ∬f(x,y) dx dy...

Q: The National Safety Council released the following data on the incidence rates for fata or lost-work...

A: Covariance is given by, Cov(X,Y)= summation (X*Y)/n - (summation(X)/n) *(Summation (Y)/n) Correlatio...

Q: exoplain answer in words and context please the more descriptive the better

A: a)Given For a certain problem Sample size n=35Sample mean X__=1.627Sample standard deviation s=1.320...

Q: A sample is selected from a normal population withu 50 and a 12. Which of the following samples woul...

A: The z-score value for M=56 and n=4 is, z=M-μσn=56-50124=66=1 The z-score value for M=56 and n=4 is 1...

Q: Show that Ti is unbiased estimator and Tz is biared estimator.

A:

Q: State police set up a roadblock to estimate the percentage of cars with​ up-to-date registration,​ i...

A: Police wants to do vehicle inspection using roadblock.

Q: A population of values has a normal distribution with u 159 and a = 68.6. A random sample of size n-...

A: Given, mean μ = 159 Standard deviation, σ = 68.6 n = 165

Q: As part of a biology experiment Thabo caught and weighed 120 minnows. He used his calculator to find...

A: Hi! Thank you for the question, As per the honor code, we are allowed to answer three sub-parts at a...

Q: In the following problem, check that it is appropriate to use the normal approximation to the binomi...

A: Binomial distribution: A discrete r.v. X taking values 0,1,2,3, …., n is said to follow a binomial d...

Q: Help

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Q: A treatment is administered to a sample selected from a population with a mean of μ = 80 and σ = 10....

A: Given: Population mean μ=80 Population standard deviation σ=10 Sample mean (M) = 85

Correlation

Correlation defines a relationship between two independent variables. It tells the degree to which variables move in relation to each other. When two sets of data are related to each other, there is a correlation between them.

Linear Correlation

A correlation is used to determine the relationships between numerical and categorical variables. In other words, it is an indicator of how things are connected to one another. The correlation analysis is the study of how variables are related. 

Regression Analysis

Regression analysis is a statistical method in which it estimates the relationship between a dependent variable and one or more independent variable. In simple terms dependent variable is called as outcome variable and independent variable is called as predictors. Regression analysis is one of the methods to find the trends in data. The independent variable used in Regression analysis is named Predictor variable. It offers data of an associated dependent variable regarding a particular outcome.