The weights of men in a particular age group have mean ? = 186 pounds and standard deviation ? = 20 pounds. (a) For randomly selected samples of n = 4 men, what is the standard deviation, s.d., of the sampling distribution of possible sample means? s.d.(x) = (b) For randomly selected samples of n = 16 men, what is the standard deviation, s.d., of the sampling distribution of possible sample means? s.d.(x) = (c) In general, how does increasing the sample size affect the standard deviation of the sampling distribution of possible sample means? Parts (a) and (b) provide a hint. Increasing the sample size (increses/decreases/doesn't effet)the value of the standard deviation of the sampling distribution of the sample mean. A fourfold increase in sample size multiplies the standard deviation by a factor of (1/4, 1/2, 1, 2, or 4)

Q: Suppose that you are interested in determining the average height of a person in a large city. You…

A: Solution: Given information: n= 400 Sample size  x=63 inches Sample mean s= 6 inches Sample standard…

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: Suppose you sample 2 students from every classroom where a class is being held at Harvard University…

A: If a random sample of size n is taken from a population having mean  and standard deviation  then,…

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

A: Let's assume X = annual salary for one occupation.  It has mean ( µ )=123,000   and  standard…

Q: Let X denote the lifespan for a randomly selected fly. Suppose the mean and the standard deviation…

A: let X: the lifespan for a randomly selected fly  and mean of X=E(X)=μ=25 days    standard deviation…

Q: A random sample is selected from a population with mean ? = 100 and standard deviation ? = 10.…

A: Given information Mean µ = 100 Standard deviation σ = 100

Q: The law of large numbers tells us that as sample size ?n increases: the sample mean approaches the…

A: Law of large numbers: Law of large numbers says that if we take large number of samples then the…

Q: Suppose heights of dogs, in inches in a city have an unknown distribution with mean 26 and standard…

A: Given that heights of dogs in inches have a unknown distribution with mean 26 and standard deviation…

Q: (d) If the sample size is n= 16, what is the standard deviation of the population from which the…

A: Using central limit theorem.

Q: a. Calculate the mean and standard deviation of the sampling distribution of X, the sample mean…

A: Given : Population mean , μ = 34.82 Population standard deviation , σ = 5.02 sample size, n = 6

Q: A random sample is selected from a population with mean ? = 100  and standard deviation ? = 10.…

A:

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

A: Given information- Population mean, µ = 120,000 Population standard deviation, σ = 20,000 Sample…

Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 264 days…

A: Let X denote the length of pregnancies in a small rural village. According to the given information.…

Q: The distribution of average speeds of the top 53 drivers in NASCAR is roughly symmetric, unimodal,…

A: (a) Draw the normal curve with the values from Z=–3 to Z=3 The below graph represents the normal…

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

A: Given: The sampling distribution of mean is =$126,000 Standard deviation = $18000 sample = 30

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

A: n=26The mean is 134,000 and the standard deviation is 17,000.

Q: Suppose IQ scores of students at Bradley follow a normal distribution with a mean of 103 and a…

A: Calculate the IQ score for the top 2.5% of all IQ's at this college.

Q: 2. Below is the mean systolic blood pressure for men and women participating in a study: N Sample…

A: To calculate the estimated difference in mean systolic blood pressure between men and women and the…

Q: What is the standard error of the mean for a sample that has n=53 people and comes from a population…

A: It is given that n = 53s = 11

Q: For a sample of n = 20 scores, X = 25 corresponds to z = -1.20 and X = 40 corresponds to z = +1.80.…

A: Given information: The sample size, n is 20. When, X=25 the corresponding Z is -1.20 When X=40 the…

Q: (a) Mean =10 , median =10 , standard deviation =4   The coefficient of skewness is    . This…

A: Skewness indicates asymmetry of a bell shaped curve. When the bell shaped curve losses symmetry and…

Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 260 days…

A: Given Information Mean µ = 260 Standard deviation(σ) = 14

Q: In 1977, men who were under 50 years old had a mean weight of 175 pounds, with a standard deviation…

A: Given: mean(μ)=175standard deviation(σ)=18

Q: If the standard deviation of all dogs is 54 lbs, what is the standard deviation of the average…

A: Given,σ=54n=110σx=?

Q: A random sample is selected from a population with mean ? = 100 and standard deviation  ? = 10.…

A: Formula: mean = μ  standard deviation = σ/√?

Q: A survey was taken in a college class asking how many people lived in each student's household, with…

A: From the given information, x f xf fx^2 1 3 3 3 2 6 12 24 3 16 48 144 4 4 16 64…

Q: For men heights are normally distributed with a mean of 69 inches and a standard deviation of 2.8…

A: The random variable X is heights of the men. It is normally distributed. X~N(μ=69,σ=2.8) The sample…

Q: A random sample is selected from a population with mean ? = 100 and standard deviation ? = 10.…

A: Formula: mean = μ standard dev = σ/√?

Q: Alex wants to find out: if the standard deviation of the mean for the sampling distribution of…

A: Solution: given standard deviations of sample s1=9. fir sample size n1=256  Then what will be the…