7. A sample of size 9 from a norınal population gave x = 15-8 and s2 10:3. Find a 99% interval for population mean.

Q: Suppose an equal number of 12- to 14-year-old girls below and above the poverty level are recruited…

A:

Q: A sample from a normal population with µ = 50 and σ = 6 has a mean of M = 48.20. If the sample mean…

A:

Q: Let X1, ... , Xn be identically and independently distributed with population mean 7.4 and standard…

A: Given that, X1, ...., Xn are iid with mean 7.4 and standard deviation 0.94 n=20 We know that ,

Q: A random sample of n1 = 14 winter days in Denver gave a sample mean pollution index x1 = 43.…

A: We have given that  Sample sizes n1=14   , n2= 10  Sample means xbar1=43, xbar2=35  And standard…

Q: Suppose the parent population X from which we are about to sample is exponential with E(X) = 2. Let…

A: here given , parent population follow exponential distribution with mean = 2 for exponential…

Q: f. A random sample of n=80 observations from a quantitative population produced X = 30.2 and s2 =…

A: Given X-bar=30.2 n=80

Q: If all the possible random samples withn 36 scores are selected from a normal population with u- 80…

A: sample mean=E(X¯)=E∑i=1nXi/n=∑i=1nμn=nμn=μsample mean=μ=80

Q: 5. A population of N=6 scores has EX=48 What is the population mean?

A:

Q: A random sample of n1 = 16 winter days in Denver gave a sample mean pollution index x1 = 43.…

A: The pollution index is normally distributed in both Englewood and Denver.  The sample size, sample…

Q: If you obtained a test score of 78 on a test with an average test score of your class is 70, and SD…

A: Given, -x = 70 SD = 4 n = 36

Q: What proportions of males and females wear a facemask while in a large parking lot? There is some…

A: p^m=Xmn

Q: a. A sample of n = 25 scores is selected from a population with μ = 62 and σ = 12.  If the sample…

A: Given Information ' n = 25 μ = 62 and σ = 12 Sample mean M = 56

Q: The critical values associated with a 80% Cl for the population mean when x = 12.5, %3D n 13 and o…

A:

Q: A given distribution has a population mean, μ, of 107 and a population standard deviation, σ, of 12.…

A: Given information: μ=107 σ=12.  x=99

Q: in a random sample of 500 persons belonging to urban area 200 are found 1o be commuters of public…

A:

Q: A population has mean 16 and standard deviation 1.7. The mean of ?⎯⎯⎯⎯⎯X¯ for samples of size 80 is

A:

Q: 1) For a normal population with mean = 100 and population standard deviation = 20: a. What is…

A: Standard normal distribution: The standard normal distribution is a special case of normal…

Q: (b) If the permeability index is to be determined for each specimen in a random sample of size 10,…

A: Given that  Mean = μ = 1000 Standard deviation = σ = 150 Sample size = 10  X ~ Normal  ( μ = 1000 ,…

Q: Consider a random sample of (X, Y), with a sample size of n. How will the following estimators…

A:

Q: . For a population with = 8, a raw score of X = 43 corresponds to z = -0.50.  What is the mean for…

A:

Q: 1) Suppose that 1,000 students took a Math examination wherein the maximum score that they can…

A: We assume that the score of the 1000 students is normally distributed with mean 70 and standard…

Q: For a sample with s = 12, a score of X = 73 corresponds to z = 1.00. What is the sample mean?

A: According to the provided information, s=12 X=73 z=1

Q: 1. Incide nce rate in the last influenza epidemic was found to be 50 per thousand (S%) of the…

A: Concept: for this question, we need to employ Cochran’s Sample Size Formula given by:…

Q: for a normal population mean with SD= 1.4, if a sample of size 25, mean= 9.8. Then The 95% one-sided…

A:

Q: (5) At the a = 0.05 level, test the claim that the proportion of defects for hair dryers is 0.3. If…

A: Given: n=200 and x=57. Then,p^=xn=57200=0.285

Q: In a population with o = 8, a score of X = 44 corresponds to a z-score of z= -0.50. What is the…

A: Here, standard deviation is 8, X = 44, and z = –0.50.

Q: A population with a mean of μ = 8 has SX = 40. How many scores are in the population?

A: It is given that, the population mean is µ = 6 and ΣX = 40.

Q: If a random sample of size n=160 has x¯=105 and s=9.5, find the standard error of the statistic.…

A:

Q: A random sample of n1 = 20 winter days in Denver gave a sample mean pollution index x1 = 43.…

A: The level of significance is 0.01.

Q: f. A random sample of n= 80 observations from a quantitative population produced I = 30.2 and s? =…

A:

Q: 9. To evaluate the effect of a treatment, a sample is obtained from a population with a mean of pu =…

A:

Q: A sample of n = 16 scores is obtained from a population with μ = 70 and σ = 20. If the sample mean…

A: The sample mean also follow normal distribution with following parameters

Q: 1. Find the percentage of N.d. observations with a zz-score between z1= -3.04 and z2 = 2.85. Give…

A: The z scores are standard normal variable with mean 0 and standard deviation 1

Q: If the standard error of the mean for the sampling distribution of random samples of size 25 from a…

A: Given:

Q: Consider a sample of observations {x1, x2,..., Xn). You are given: the mean x = 115.58, the standard…

A: From the provided information,

Q: For a sample with s = 9, a score of X = 67 corresponds to z = +1.00. What is the sample mean?

A:

Q: The research examining the effects of preschool childcare has found that children who spent time in…

A:

Q: A random sample of n1 = 18 winter days in Denver gave a sample mean pollution index x1 = 43.…

A: The given summary statistics are given below:

Q: The mean age of a random sample of 70 adults is 55yrs with SD=7yrs •Find a 95%CI, 90% & a 99%

A: Given,sample size(n)=70sample mean(x¯)=55standard deviation(s)=7degrees of freedom(df)=n-1df=70-1=69

Q: A sample is selected from a normal population with µ = 40 σ = 10. If the sample mean of M = 46…

A:

Q: A random sample of n1 = 20 winter days in Denver gave a sample mean pollution index x1 = 43.…

A: Given  n1= sample size of of winter days in Denver =20X1 =sample mean of winter days in Denver =…

Q: If a sample of n = 25 scores is selected from a normal population with µ = 100 and σ = 20, then the…

A:

Q: 6. Assume that the weights of quarters are normally distributed with a mean of 5.67 g and a standard…

A: Here, µ= 5.67, σ= 0.070. The legal quarters will be accepted if coins weigh between 5.48 and 5.82.

Q: If x is normally distributed with population mean=20.0 and population standard deviation = 4.0,…

A: Assume, x be the random variable. μ be the mean. σ be the standard deviation. It is mentioned that…

Q: To estimate E[Xx], you have simulated X,, X,, X,, X, and X, with the following results: 1 2 3 4 You…

A:

Q: The distribution of the weights of a sample of 1,400 cargo containers is symmetric and bell-shaped.…

A:

Q: A random sample of n = 19 winter days in Denver gave a sample mean pollution index x1 = 43. Previous…

A: From the provided information,