1. If the standard deviation of the mean for the sampling distribution of random samples of size 36 from a large or infinite population is 2, how large must the sample size become if the standard deviation is to be reduced to 1.2?

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: The annual salary for one particular occupation is normally distributed, with a mean of about…

A: The mean is 131,000 and the standard deviation is 17,000.

Q: For a population with the mean of u = 45 and a standard deviation of 10, what's the standard error…

A: Given that, Mean = 45 Standard deviation = 10

Q: If the sample size is 36 and the population standard deviation is 24, then the standard deviation of…

A:

Q: Given that x is distributed normally with mean 74 and standard deviation 10, what is P(72 < x < 82)…

A:

Q: According to the rules of probability, if a sampling distribution has a standard error of .45, the…

A: Solution: From the given information, the standard error of the sampling distribution is 0.45.

Q: If the standard error (σX) of the mean distribution is 10 and the sample size is 25, then what is…

A: Given information Standard error of the mean distribution = 10 Sample size = 25

Q: when samples of size 25 are collected from a normal population that has a mean of 100 and a standard…

A: The sample standard deviation (s) is equal to the ratio of standard deviation of the population σ…

Q: Suppose a population has a mean of 100 and a standard deviation of 15. If repeated samples of size…

A: Given: n = 25 σ=15μ=100 The standard deviation of the sample means can be calculated as: σX=σn

Q: a) In the analysis of a barrel of powder, the standard deviation of the sampling operation is ±4%…

A: a) The standard deviation of the sampling operation is ± 4% or ± 0.04 and the standard deviation of…

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: A distribution with a mean of μ = 87 and a standard deviation of σ = 12 is transformed into a…

A:

Q: If the standard deviation of a population is 20 and we take a sample of size 16 from which to…

A: Given information Standard deviation σ = 20 Sample size n = 16

Q: The law of large numbers tells us that as sample size n increases: the sample standard deviation…

A: Correct answer is (c). The sample mean approaches the population mean.

Q: 8, and the sample standard deviation, s, is found to be 4.6. ...

A:

Q: Compute the standard deviation of the sampled proportions if p=.4 and n=500. Round to three places.

A: We want to find standard deviation  X~Binomial(n=500,p=0.4)

Q: Assume the annual day care cost per child is normally distributed with a mean of $7000 and a…

A: given: Mean=$7000 SD=$1500

Q: The mean and standard deviation of a population are 200 and 20, respectively. Suppose samples of…

A: Given : μ = 200 , σ= 20 and n= 36

Q: 2. Assume that, among residents of a large (over 6,000) Florida subdivision, the population mean age…

A: From the given information, The mean age is 65 and standard deviation is 2 years.

Q: Suppose that the percentage of defective items on a certain production line is 15%. Draw 8 items at…

A: Given ,n=8p=0.15X=no.of defective itemsX~Binomial(n=8 , p=0.15)P(X=x)=cxn  px (1-p)n-x  ;…

Q: For a normally distributed population with a mean of 35 and a standard deviation of 7.5 find P(X <…

A:

Q: Again, suppose we are now interested in taking random samples of 800 US adults instead of 150 and…

A: We know that,  Proportion p= X/n Where n is sample size.

Q: If X is normally distributed around a mean of 24 with a standard deviation of 20, find P(X > 35) P(…

A:

Q: A hypothetical distribution for a population of test scores has a mean of 60.4, a median of 62.8,…

A: According to the given information in this question We need to find standard deviation of sampling…

Q: The following data are from a simple random sample. 4   8   13   7   13   15 What is the point…

A: According to the provided information, The samples are 4 8 13 7 13 15

Q: A set of data is found to have a sample standard deviation of 25. Suppose 9 were added to each of…

A: Given: s=25 9 is added to each of the values.

Q: Assume the stated rate of 8% is indeed the correct proportion for all US adults. What is the…

A: We have to find correct answer.

Q: Suppose that quiz scores in a beginning statistics class have a mean of 7.67.6 with a standard…

A: Given data ,Mean μ=7.6S.Dσ=0.5What is min % b/w 6.1 and 9.1 ?

Q: if the sample mean is 10, the population standard deviation is 20, and the sample size is 25, then…

A:

Q: The variance of a sample of 169 observations equals 576. The standard deviation of the sample equals…

A: given  variance of sample = 576 we know that , sample standard deviation equals square root of…

Q: Find the sample variance and sample standard deviation of a population. Given that population…

A: Here Given  σ=6 Sample size=n=21

Q: For a normally distributed population with a mean of 35 and a standard deviation of 7.5 find P(X <…

A:

Q: If one normal distribution has a standard deviation of 5, and another has a standard deviation of…

A: Given that  One normal distribution has standard deviation is 5. Another has standard deviation of…

Q: Suppose the mathematics SAT scores are normally distributed with a mean of 500 and a standard…

A: Given that  X~Normal(μ =500 , ? =100) X=SAT score  Z-score=(X-μ)/?

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

A: X follows a Normal distribution with mean = 35 and S.D = 7.5 Then z=(x-mean)/SD = (x-35)/7.5…

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: 7. Suppose the length of newborn babies in a community is normally distributed with an average of 50…

A: We have given that  Mean=mu=50 Standard deviation=sigma=3 X~Normal(mu=50,sigma=3)

Q: 2. A researcher wishes to estimate within P20 the average cost of postage a community college spends…

A:

Q: - If a population with µ =72 and o = 8, the distribution of z-scores will have a mean and standard…

A: Given: Mean = µ = 72 Standard deviation = σ = 8

Q: If you draw a sample of size 10 from a population of size 35 with a population mean of 83.4 and…

A: In question, Given that you draw a sample of size 10 from a population of size 35 with a population…

Q: Suppose we want to test whether or not the average SAT score at the University of Seychelles is…

A: From provided information, It is claimed that the average SAT score at the University of Seychelles…

Q: When samples of size 30 are collected from a normal population that has a mean of 200 and a standard…

A:

Q: In general, the standard error of the sampling distribution is __________the standard deviation from…

A: We know that, Standard error is given by, SE= sigma/√n Where sigma is standard deviation and n is…

Q: Assume that a population is normally distributed with a mean of 100 and a standard deviation of 15.…

A: Since the area corresponding to z-value 1.73205 is 0.958368 calculated by Excel command NORM.S.DIST…

Q: When samples of size 25 are collected from a normal population that has a mean of 100 and a standard…

A: Given, n = 25 μ = 100σ = 20       To find, Sampling distribution of standard deviation?

Q: Suppose that, on average, electricians earn approximately µ = $54,000 per year in the United States.…

A: Given information- Population mean, µ = $54,000 Population standard deviation, σ = $12,000 Sample…

Q: Suppose that the scores on a statewide standardized test are normally distributed with a mean of 68…

A: As per our guideline we are supposed to answer only  3 sub-parts of any question

Q: If the standard error of the sample mean is 5, for samples of size 25, what is the popu lation…

A:

Q: Assume the population of 5 year children in the U.S. have a population mean weight of 44 lbs. with a…

A: Given data: Mean = 44 lbs Population standard deviation =2.89 lbs Sample size = 35 To find: What…