Assume you are comparing 2 brands of dishwashers. Bfand A has a mean of 72 months with a standard deviation of 5 months. Brand B has a mean of 80 months with a standard deviation of 10 months. Which brand is more reliable? Which brand lasts longer?

Q: After this year's census of its members, the local pilots association found that its members have a…

A: The mean is 4,610 hours and the standard deviation is 671 hours.

Q: Wyatt earned a score of 670 on Exam A that had a mean of 750 and a standard deviation of 50. He is…

A: Here both exam A and exam B are normally distributed. We need to find the marks required in exam B…

Q: In a series of 5 observations, the values of mean and variance are 4.4 and 8.24. If three…

A:

Q: u and your friend have recently taken two different standardized mathematics exams. You scored 92 on…

A: The mean = 100The standard deviation = 10

Q: The weights of men in their 30s are normally distributed with a mean of 190 pounds and a standard…

A: From the provided information, Population mean (µ) = 190 pounds Population standard deviation (σ) =…

Q: The studernt scored the same on both tests. O B. The student scored better on the mathematics test.…

A: Given : For geography test student score, x = 68.0 population mean, μ = 80.0…

Q: It seems these days that college graduates who are employed full-time work more than 40 -hour weeks.…

A: From the provided information, Population mean (µ) = 40 hours Sample size (n) = 19 Sample mean (x̅)…

Q: An incoming MBA student took placement exams in economics and mathematics. In economics, she scored…

A:

Q: health economist does a study on the average life expectancy of every country in Europe.  The…

A: Given, mean life of the country is 81.2 and standard deviation is 3.7. Z-score is 1.2. We will use…

Q: Scores by women on the SAT-1 test are normally distributed with a mean of 988 and a standard…

A: Given Information Now we have to calculate corresponding Z value                         Z = 0.7388…

Q: What will be the interpretation if correlation (r) has a value of -.5439? At what percent does the…

A: Correlation coefficient "r" measures linear relationship between between two variables. It lies…

Q: It is 2075 and Stella, an amateur astronomer, recently was watching rocket launches on a Saturday…

A: Note: As per our company guidelines we are supposed to answer only first three sub-parts. Kindly…

Q: Doug has 1,000 bottle caps in his collection compared to Melissa's 2000 bottle caps. If the average…

A: Given,mean(μ)=1250standard deviation(σ)=500Doug bottle cap collection(X)=1000Melissa's bottle cap…

Q: A reading exam was conducted for 4thgrade children and 9thgrade children. The 4thgrade children have…

A: Given: For 4th grade children mean μ is 20 and standard deviation σ is 5. The mean of 9th grade…

Q: The results of a common standardized test used in psychology research is designed so that the…

A:

Q: Students receive an A+ on a 60 point test if they score 55 points or more.  The marks of a large…

A: Given: X~N(μ,σ)μ=50σ=5

Q: A statistics test has a mean of 60 and a standard deviation of 10 while an accounting test has a…

A: Given information Statistics test Mean µ = 60 Standard deviation σ = 10

Q: Does variance matter? Think of an example.   Here is my example: I have two routes to my work.…

A: Variance is known as the second moment around the mean. Variance indicates the average squared…

Q: It seems these days that college graduates who are employed full-time work more than 40-hour weeks.…

A:

Q: It seems these days that college graduates who are employed full-time work more than 40 -hour…

A: Given information- Population mean, μ = 40 Sample size, n = 19 Sample mean, x-bar = 44 Sample…

Q: The scores on an international business entrance have a mean of 480 and a standard deviation of 90.…

A: The mean of data is given as-The standard deviation of the data is given as-

Q: Researchers measured the waist sizes of 230 men in a study on body fat. The true mean and standard…

A: Suppose researchers measured the waist sizes of  men in a study on body fat. The true mean:…

Q: The summary data from study demonstrates a stronger relationship between how many minutes per day a…

A: Given : A standard deviation is a measure of how dispersed the data is in relation to the mean. Low…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 102 and a standard…

A:

Q: The department of public safety has an old memo stating that the number of accidents per week at a…

A: From the provided information, Sample size (n) = 52 Sample mean (x̅) = 2 Population standard…

Q: The results of a common standardized test used in psychology research is designed so that the…

A: Suppose that the random variable x defines the scores in psychology research.

Q: A company is doing a hypothesis test on the variation in quality from two suppliers. Both…

A: supplier 1:first sample = n1 = 34standard deviation from of quality from supplier 1 is…

Q: once, so that they na standard deviat

A: Alex cuts four sticks one at a time and their lengths are independent  with mean = 8 and Standard…

Q: standardized test has a pop. mean of 152 and a standard deviation of 16. Jenny's z score is -0.56…

A: Given that Jenny's z score= -0.56, Nicole's z score=1.13

Q: A set of math test scores has a mean of 70 and a standard deviation of 8.  A set of English test…

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

Q: Which of these statements is best?       The variable to be predicted is the independent variable.…

A: Which of these statements is best?       The variable to be predicted is the…

Q: Hamad scored 67 on the maths final exam and 82 on the marketing final exam. The maths exam had a…

A: X1: score in maths final examand X2: score in marketing final examGiven;x1=67 ,  μ1=mean(X1)=55  ,…

Q: facing a shortage the student activity council decides to reduce funding for each of it's student…

A: Given : facing a shortage the student activity council decides to reduce funding for each of it's…

Q: n Professor Krugman's economics course, the correlation between the students' total scores prior to…

A: Solution: Given information:  Let x= The pre‑exam totals  and  y= The final‑exam scores  r= 0.5…

Q: 3. Assume that in a political science dass, the teacher gives a midterm and a final exam. Assume…

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Q: An incoming MBA student took placement exams in economics and mathematics. In economics, she scored…

A:

Q: ASK YOUR TEACHER   Pyramid Lake is on the Paiute Indian Reservation in Nevada. The lake is famous…

A:

Q: The results of a common standardized test used in psychology research is designed so that the…

A: Given Population mean = 140 Population standard deviation = 40 Score =X= 44

Q: It seems these days that college graduates who are employed full-time work more than 40-hour weeks.…

A: Given data is appropriate for testing of hypothesis to test t-test for single mean. because it is a…

Q: Americans (on average) individually eat 16 pounds of seafood each year with a standard deviation of…

A: Given that   x̄ = 14 , μ = 16 , ? = 7 , n = 4

Q: It seems these days that college graduates who are employed full-time work more than 40-hour weeks.…

A: We have to test claim.

Q: A bank loan officer rates applicants for credit. The ratings can be described by a normal model with…

A: Given: μ = ​200 σ = 50

Q: Q3 :- :- if you know the standard deviation = 3 for measured data, what is the variance ?

A: Given in question  Standard deviation = 3

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.