(a) What response represents the 90th ​percentile? ​(b) What response represents the 63rd ​percentile? ​(c) What response represents the first ​quartile?

Q: Normal, with mean 70 inches and standard deviation 8 inches. ) If you choose one student at random,…

A: We have given that.   X~N( μ , ?^2 )   μ =6 , ? =2.4  , n= 25   Z-score =( x - μ )/?

Q: Suppose the population values 50 and 80 and that their corresponding z scores are -1 and 2…

A: The z score for the population value of 50 is -1 and the z score for the population value of 80 is…

Q: For males in a certain town, the systolic blood pressure is normally distributed with a mean of 120…

A: We have given that,  X be the random variable from normal distribution with (μ)= 120 and standard…

Q: 4. In a study about the life expectancy of 200 thirty-year old males, the mean is 65 and the…

A: We have given that.   X~N( μ , ?^2 )   μ= 65   , ?=10   Z-score =( x - μ )/?

Q: Do the data support your claim at the 1% level?

A: The summary of the statistics is, The type of test is right tailed test

Q: To test the theory that the consumption of red meat has decreased over the last 5 years, a…

A: Given: x¯1=34s1=13n1=400x¯2=31s2=14n2=400

Q: Recently, a random sample of 25–34 year olds was asked, "How much do you currently have in savings,…

A: From the different savings class we need to find first the class mid point(xi) . And the frequency…

Q: It is possible to score higher than 16001600 on the combined mathematics and reading portions of the…

A:

Q: It is possible to score higher than 16001600 on the combined mathematics and reading portions of the…

A:

Q: An economic analyst believes the average income for the United States equals $44,000. Suppose  she…

A: Given that  Sample size n =900 Sample mean =43250 Population standard deviation =7500

Q: Suppose that IQ scores have a bell-shaped distribution with a mean of 103 and a standard deviation…

A:

Q: A standardized test of intelligence is scaled so that the mean IQ is 100, and the standard deviation…

A: Given that information  Mean = mu= 100  Standard deviation = s =15  Zscore = (x - mu)/s

Q: What is the z-score of x = 11, if it is 2.5 standard deviations to the left of the mean?

A:

Q: In the last quarter of​ 2007, a group of 64 mutual funds had a mean return of 3.4​% with a standard…

A:

Q: In a recent year, the ACT scores for high school students with a 3.50 to 4.00 grade point average…

A: (a)   Obtain the least score that a student can receive and still be admitted. The least score that…

Q: The results of the nationwide aptitude test in Mathematics are normally distributed with mean = 80,…

A: As we are entitled to solve one question at a time I will answer 2nd one as some information is…

Q: At = α 0.05 , is there sufficient evidence to conclude that the mean number of friends is greater…

A: It is given that Sample size n = 33 Sample mean = 156 Population SD = 38.8 Level of significance =…

Q: 4. A recent study stated that if a person smoked, the average of the number of cigarettes he or she…

A: Given that  Hypothesized Population Mean (\mu)(μ) = 1414 Population Standard Deviation…

Q: What x-values correspond to the middle 40% of a population (20% on each side of the mean) with a…

A: Given that,  μ=21.4,σ=2.3 The x-values correspond to the middle 40% of a population are,

Q: 2. Solar energy is considered by many to be the energy of the future. A recent survey was taken to…

A: Hey there! Thank you for posting the question. Since your question has more than 3 parts, we are…

Q: The mean number of hours per day spent watching television, according to a national survey, is 3.5…

A: From the provided information, Mean (µ) = 3.5 Standard deviation (σ) = 2

Q: Suppose the exam average in a class is 72% with a standard deviation of 3. What proportion of…

A: Given data: Average score = 72 % Standard deviation  = 3% To find: What proportion of students…

Q: Q2: The mean systolic blood pressure, measured in Nasriya City, of 130 men aged between 50-65 years,…

A: Given: n=130x¯=145.5s=2μ=150α=0.05 The test hypothesis are, H0: μ = 150 H1: μ ≠ 150 This is a…

Q: Suppose the test scores in a class are normally distributed with a mean of 70 and a standard…

A: The Z-score of a random variable X is defined as follows: Z = (X – µ)/σ. Here, µ and σ are the mean…

Q: . An article in the Daily Bulletin stated that students in Angeles City University take 4.5 years on…

A: Given: Population mean, μ=4.5Sample size, n=49Sample mean, x¯=5.1Sample sd, s=1.2α=0.01

Q: In 2002, the mean age of an inmate on death-row was 40.7 years, according to data from the US…

A:

Q: An article in the San Jose Mercury Newsstated that students in the California state university…

A:

Q: An article in the San Jose Mercury News stated that students in the California state university…

A: It is an important fact in statistics . It is widely used  in hypothesis testing problems .

Q: a.     What statistical test will you use to test this data ?   b.     State the null and…

A: From provided information it is claimed that, women’s movement has resulted in an increase in the…

Q: A positively skewed population has a mean of μ= 150 and a standard deviation of σ= 10. What is the…

A: Solution: From the given information, µ = 150 and σ = 10.

Q: a) If a state university automatically admits the top 7% of students, what is the least score that a…

A: Note: According to bartleby experts question answers guidelines an expert can solve only first three…

Q: The mean cost of a five pound bag of shrimp is 50 dollars with a standard deviation of 6 dollars.…

A: Given information Mean (µ) = 50 Standard Deviation(σ) = 6 Sample size (n)= 40 probability that the…

Q: Suppose that the score on a reading test are normally distributed within a mean of 70 and a standard…

A:

Q: Say that an extraversion scale has a population mean of 40 and a standard deviation of 10. About…

A:

Q: In a study of 400 people, the mean age is 50 years and the standard deviation of age is 10 years.…

A:

Q: According to a recent report from the U.S. National Center for Health Statistics, females between 25…

A: Solution: We are given that:Females between 25 and 34 years of age have a bell-shaped distribution…

Q: If a student scored 77 points on a test where the mean score was 84.5 and the standard deviation was…

A: Given: Score of student(x)=77Population meanμ=84.5Population standard deviationσ=5.1

Q: 2.5% Of scores on a normally distributed college entrance test or below 60% and 2.5% of the scores…

A:

Q: An article in the San Jose Mercury News stated that students in the California state university…

A: State the hypotheses.

Q: In a certain presidential election, 38% of voting-age Americans actually voted. In our town of…

A:

Q: What is the z-score of x = 75, if it is 2.8 standard deviations to the left of the mean? Answer to…

A: If the x = 75 is 2.8 standard deviations to the left of mean. Z value tells the distance from the…

Q: During the winter term, the same student's trip to their college takes 16.39 min by car, with a mean…

A: Solution: Let X be the trip time. From given information, X has mean µ=14.65 min and a standard…

Q: A trucking firm suspects that the mean life of a certain tire it uses is less than the advertised…

A:

Q: IQ is normally distributed with a mean of 100 and a standard deviation of 15.    In a sample of 500…

A: The normal distribution: A continuous random variable X is said to follow normal distribution with…

Q: Suppose that IQ scores have a bell-shaped distribution with a mean of 96 and a standard deviation of…

A: 17. Empirical rule (68 – 95 – 99.7 rule): For a bell shaped distribution (normal) the empirical rule…

Q: What proportion of 2-year-old children watch more than90 minutes of television each day? What…

A: Given: µ = 60 minutes  σ = 25 minutes  Part (1) Consider X as a random variable that follows a…

Q: A study of the wages of 100 persons grouped in class-intervals of Dollar 10-12, 12 14 ... etc.…

A: Solution:

Q: What is the z score of x = 9, if it is 1.5 standard deviations to the right of the mean?

A: Given X = 9 also  X = μ + 1.5 (σ) --1

Q: The president of a college wants to determine the mean number of units that college students take…

A: From the given information, the population standard deviation is 2.1 units, the confidence level is…

Q: It is believed that nearsightedness affects 14% of children in a certain region. A school district…

A: Let X denote the number of nearsighted children in a group and it follows binomial distribution with…