A sampling distribution of the mean has a mean μ X̄ =57 and a standard error σ X̄ =8 based on a random sample of n=12. a. What is the population mean? b. What is the population standard deviation?
Q: Find the sample variance and sample standard deviation of a population. Given that population…
A: We have given that, Population standard deviation (σ) = 15 and sample size (n) = 25
Q: a. Find the percentage of men meeting the height requirement. What does the result suggest about the…
A: Women's height is normally distributed with following parametersPopulation mean,Population standard…
Q: A study was done on body temperatures of men and women. The results are shown in the table. Assume…
A: Given information- 1- Denotes men body temperature. 2 – Denotes Women body temperature. We have to…
Q: How many light bulbs must a company test to determine the mean number of hours that they will last?…
A: Given that, The company wants to be 90% confident that their mean is within 40 hours of the…
Q: i am not able to see the answer properly
A: “Since you have posted multiple questions, we will provide the solution only to the first question…
Q: A public bus company official claims that the mean waiting time for bus number 14 during peak hours…
A:
Q: A survey found that women's heights are normally distributed with mean 62.2 in. and standard…
A: Women's heights are normally distributed with a mean of 62.2 in. and a standard deviation 2.8…
Q: The weights of goods 6g . tells you that the net weight is actually a Normal random variable with a…
A: If multiple samples of same size is draw from the population and the sample mean for each sample is…
Q: The symbol σ¯xσx¯ represents the population standard deviation of all possible sample means from…
A: The given statement is FALSE. Because, the symbol σx-bar represents the standard deviation of the…
Q: Calculate the sample standard deviation for this data set: 65, 48, 70. The formula for the sample…
A:
Q: Which of the following is a fundamental difference between the t statistic and a z-score? a. The t…
A: We have define the basic difference between t statistic and z score
Q: . Then Var(X+Y+Z) is equal to:
A: Here x , y and z are independent variables So covariance between them are zero
Q: What symbol is used for the standard deviation when it is a sample statistic? What symbol is used…
A:
Q: When a random sample of participants is selected from a population, the sample mean is not expected…
A: See the below answer
Q: During a Formula 1 test. 25% of the cars that participated in the test experienced a tire blowout.…
A: Correct answer is (C) 0.1484
Q: Calculate both the sample and the population standard deviations using the data below. x 27 21 17 14…
A: X X2 27 729 21 441 17 289 14 196 7 49 1 1 ∑x=87 ∑X2=1705
Q: Intelligence quotas on two different tests are normally distributed. Test A has a mean of 100 and a…
A: Given: Test A: Mean,μ=100 and Standard deviation,S.D.=13 Test B: Mean,μ=100 and Standard…
Q: A random variable has a normal distribution with a mean of 15 and a standard deviation of 2.5.…
A: The given mean is 15, and standard deviation is 2.5. The standard score is -2.15.
Q: A manufacturer claims that the mean weight of its ice cream cartons is 10 ounces with a standard…
A: The random variable is weight of ice cream cartons. The population mean is 10 ounces. The population…
Q: er to use the defining formula for sample standard deviation, it is helpful to first calculate (x -…
A:
Q: Find the mean, variance, and standard deviation of the binomial distribution with the given values…
A: It is given that, n=129 p=0.27
Q: Which of the following statistical distributions is used when estimating the population mean when…
A: We know that- We use Standard normal distribution when the population variance or population…
Q: When a production process is operating correctly, the number of units produced per hour has a normal…
A:
Q: A population has a mean μ=79 and a standard deviation σ=18. Find the mean and standard deviation of…
A:
Q: A sampling distribution of the mean has a mean μ x σχ - 6 based on a random sample of n = 14. a.…
A: GivenMean(μx)=52standard error(σx)=6sample size(n)=14
Q: The symbol oz represents the standard deviation of a sample of size n. True O False
A: Answer : B. False
Q: Claim: The standard deviation of pulse rates of adult males is more than 11 bpm. For a random…
A:
Q: Intelligence quotas on two different tests are normally distributed. Test A has a mean of 100 and a…
A:
Q: Why is the standard deviation used more frequently than the variance? Choose the correct answer…
A: The question is about measures.Introduction :Variance :1 ) It is used to measure how much amount of…
Q: Heavy children: Are children heavier now than they were in the past? The National Health and…
A: Given that Sample size (n)=190 Sample mean=52.5 Standard deviation =17.2 Level of significance=0.05…
Q: A normal distributed population has parameters Mean =57.1 and standard deviation = 49.2. If a…
A: Mean = 57.1 Standard deviation = 49.2 Sample size, n = 75
Q: The average American male has a BMI of 28.6 and having a BMI over 25 is considered obese. In a…
A: The standard deviation of the sampling distribution of the sample mean is given by
Q: Variance is the average of Select one: a. squared diviations b. absolute deviations c. rooted…
A:
Q: DE test scores 20 30 40 50 60 70 80 frequency 1 4 6. 5 4 3 2.
A: From the provided information, The table is as follow: DE test scores (xi ) Frequency(fi)…
Q: A population has a mean μ=79and a standard deviation σ=14. Find the mean and standard deviation of a…
A: We have to find sampling distribution
Q: the mean with the value of _____ if it is standardized. a.
A: Here X ~N( mean , variance) if it standardized that z = (x -mean )/sd ~ N(0,1)
Q: Choose the letter of the correct answer. The two important parameters that best describe the normal…
A: Given the statements : The two important parameters that best describe the normal curve are the…
Q: The sample mean is x= 2.1. (Round to one decimal place as needed.) The sample standard deviation is…
A:
Q: In an Algebra class, the scores on a test are normally distributed. The middle 68% of the scores…
A: In an Algebra class, the scores on a test are normally distributed. The middle 68% of the scores…
Step by step
Solved in 2 steps
- An unknown distribution has a mean of 100, a standard deviation of 100, and a sample size of 100. Let X = one object of interest. What is the mean of EX? (Enter an exact number as an integer, fraction, or decimal.) 1000 X How are the population mean and sample size used to calculate the mean of sums? Additional MaterialsThe distribution is used when the population distribution is normal and Select one: O a. Both a and b are correct. O b. When the sample size is more than 30. O c. When sample size is less than 30 and the population standard deviation is not known. O d. The population standard deviation is also known.4 A variable of a population has a mean of μ=81 and a standard deviation of σ=7. What is the mean of the sampling distribution? (Simplify your answer.) What is the standard deviation of the sampling distribution? (Simplify your answer.)
- A computer scientist estimates that the proportion of users that properly back up their data is p = 0.304. They will randomly select n = 380 users and will compute the sample proportion that properly back up their data. What is the mean of the distribution of the sample proportion? What is the standard deviation of the distribution of sample proportion? (Report answer accurate to 3 decimal places.) Add WorkIn an independent groups experiment, group A’s mean is 220 and group B’s mean is 180. The estimated population standard deviation is 12, and the standard error of the distribution of differences between means is 20. What is the t obtained value? 2.0 3.33 20 10.00For a sample, a score that is 12 points above the mean has a z-score of z = 1.20. What is the sample standard deviation?
- 4000 B.C. A.D. 150 A study was done on skull sizes of humans during different time periods. The results are shown in the table. Assume that the two samples are independent simple random samples selected from normally distributed populations, and do not assume that the population standard deviations are equal. Complete parts (a) and (b) below. H2 27 27 131.05 mm 133.94 mm S 5.18 mm 5.27 mm a. Use a 0.05 significance level to test the claim that the mean skull breadth in 4000 B.C is less than the mean skull breadth in A.D 150. What are the null and alternative hypotheses? O B. Ho: H1 =H2 O A. Ho: H1 =H2 H:H1> H2 OC. Ho: H1 = H2 H1: H1 # H2 O D. Ho: H1 # H2 H: H1A simple random sample of 64 observations was taken from a large population. The population standard deviation is 120. The sample mean was determined to be 320. The standard error of the mean is _____.Suppose that 49% of all adult women think they do not get enough time for themselves. An opinion poll interviews 958 randomly chosen women and records the sample proportion who feel they don't get enough time for themselves. a. Describe the sampling distribution of p. Mean = ________ Standard Deviation=__________ b. The truth about the population is p=0.49. In what range will the middle 95% of all sample results fall? lower bound -_______________ upper bound -_______________ c. What is the probability that the oll gets a sample in which fewer than 47% say they do not get enough time for themselves.
