(d) What height is at the 20th percentile? (e) What height is at the 80th percentile? (f) What fraction of men’s heights are between the heights you found in (d) and (e)?

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

A: Given : Suppose population values 50 and 80 and their corresponding Z scores are -1 and 2 ,…

Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 261 days…

A: Here, µ=261 and σ = 17.

Q: What z-score would be associated with the value x = 143?

A: Given that Mean = 137 SD = 15 And the value X = 143

Q: Suppose a population is known to be normally distributed with a mean, equal to 116 and a standard…

A: Given dataMean = 116Standard deviation = 14Probability that population would be between 116 and 130…

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 a sample of 300 students, you find that the mean GPA is 3.35 with a standard deviation of .21.…

A: Solution: From the given information, Standard deviation is 0.21 and n=300.

Q: What percent of data points fall in the range of z=-1.5 and z=1.5 standard deviations of the mean

A: From the provided information, The range is between z = -1.5 to z = 1.5

Q: For a population with mean 80 and standard deviation 6, what is the z-score corresponding to X = 68…

A: Given :Population mean u=80Standard deviation σ=6X=68

Q: 3. Suppose the mean blood glucose of a population of adults is 162 with a standard deviation σ=58.…

A: Given that, n=36,μ=162σ=58 The mean and standard deviation of sample mean is,

Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 267 days…

A: Solution: Let X be the length of pregnancies in a small rural village From the given information, X…

Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 262 days…

A: Given information- Population mean, µ = 262 days Standard deviation, σ = 17 days Significance level,…

Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 268 days…

A: Givenmean(μ)=268standard deviation(σ)=13

Q: For a population with a mean of 75 and a standard deviation of 12, what proportion of sample means…

A: Given, Mean μ = 75 Standard deviation σ = 12 sample size n = 16

Q: A large number of applicants for admission to graduate study in business are given an aptitude test.…

A:

Q: 1. The mean serum level measured in 12 patients twenty-four hours after they received a newly…

A: Hypothesized Population Mean (µ) = 1 mg/dl The provided sample mean is = 1.2 mg/dl Sample standard…

Q: In a population with a mean of µ = 30 and a standard deviation of σ = 5, a score of X = 18 would be…

A: Given that  μ=30 , σ=5 , X=18

Q: 2. The mean height of the grade nine students at a certain high school is 164 centimeters and the…

A: The random variable height follows normal distribution. We have to find the probability of the…

Q: If an adult male is told that his height is within 2 standard deviations of the mean of the normal…

A: If an adult male is told that his height is within 2 standard deviations of the mean.

Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 267 days…

A: Determine the range that would be expect to obtain the middle 98% of most pregnancies.   The range…

Q: If the mean exam score of a class was 75%, with a standard deviation of 15%,what percent of students…

A: Given,mean(μ)=0.75standard deviation(σ)=0.15

Q: A score that is 6 points below the mean correspond. to a z-score of z = -2.00. What is the…

A: The following is the formulae for z-score                       i.e., z=X-μσ Here, X is variable…

Q: In a certain​ study, women's heights are found to be approximately normally distributed with a mean…

A: Given that, In a certain​ study, women's heights are found to be approximately normally distributed…

Q: 2 درجات annual expenditure per 25-to 34-year-old consumer for health care is $ 1468. Students at a…

A: As the population standard deviation is known, it is the z-test. Given: x¯=1520μ=1468σ=198n=60 The…

Q: - In Norway, the distribution of birth weights for full-term infants whose gestational age is 40…

A: Given data in Norway the distribution of birth weights with mean=3500 grams  standard deviation=430…

Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 267 days…

A:

Q: Suppose the scores of students on an exam are normally distributed with a mean of 454 and a standard…

A:

Q: A large retailer wants to determine whether the mean income of families living within two miles of a…

A: Denote μ as the population mean income of families living within two miles of proposed building…

Q: A large number of applicants for admission to graduate study in business are given an aptitude test.…

A:

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

A:

Q: For a sample of raw scores, you calculate a mean of 15.25 and a standard deviation of 3.19. What is…

A: Introduction:Suppose a random variable, X has sample mean, x̅ and sample standard deviation, s.For a…

Q: Suppose there is a city where the mean cost per month of a one-bedroom apartment is $1,500, with a…

A: Given: Meanμ=1500Standard deviationσ=250

Q: What is the z-score of x = 9, if it is 0.133 standard deviations to the left of the mean?

A: Given X=9,

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: for population with mean of 80 and standard deviation of 9, what is the z-score for X = 84

A: Here mean, mu= 80 Standard deviation, Sigma=9 Z Score= (X-mu)/sigma

Q: Suppose that the scores on a statewide standardized test are normally distributed with a mean of 71…

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

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

Q: In​ 2007, the mean rate of violent crime​ (per 100,000​ people) for 10 regions in the northeast of a…

A:

Q: Suppose the scores of students on an exam are normally distributed with a mean of 253 and a standard…

A: From the provided information, Mean (µ) = 253 Standard deviation (σ) = 80

Q: For a normally distributed population with a mean of 35 and a standard deviation of 7.5, what value…

A: From the given information, normal distribution with population mean as 35 and standard deviation as…

Q: For a population with mean of 50 and a standard deviation of 8, what is the Z-score that corresponds…

A: Given:  population mean of random variable x is =50 and standard deviations=8  then find z score…

Q: In a distribution of the test grades with the mean of 25 and the standard deviation of 4, what would…

A: Given,mean(μ)=25standard deviation(σ)=4grade score(X)=32

Q: Suppose that Jett achieves a score of 1250 on the SAT, and his sister Kate scores 29 on the ACT. The…

A: Given information- For SAT scores- Population Mean µ = 1100 Standard deviation (σ) = 250 For ACT…

Q: Suppose a population is known to be normally distribted with a mean, μ, equal to 116 and a standard…

A: Given information- Population mean, μ = 116 Population standard deviation, σ = 14 So, the percent of…

Q: In a population of 100 male fruit flies, the mean abdomen length is 2.0 mm and the standard…

A: Given  μ=2 and σ=0.3 Use standardization as z=x-μσ

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: According to Chebyshev's Teorem, at least what percentage of snake lengths are within K= 2.9…

A: The Chebyshev’s rule states that, for any quantitative data set and any real number greater than k,…

Q: A study of B.A. (Hons.) Economics examination results of 1000 students in 1990 gave the mean grade…

A:

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: Suppose that the scores on a statewide standardized test are normally distributed with a mean of 69…

A: Let X denote the scores on a statewide standardized test and it follows normal distribution with…

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.