3. If the mean of a sample of size 100 is 12 and the standard deviation is 2. Then 95% confidence limits are.. a. 11.04, 12.96 b. 10.98,13.02 c. 11.608 , 12.392 d. 11.2, 12.8

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: what would the mean and standard deviation of the sample proportion ˆp be?

A: Let X be Pennsylvanians who have a high school diploma Given, n = 225 p = 0.83

Q: for a population with a mean of u=72 and a standard deviation of σ=10, what is the standard error of…

A: Given,mean(μ)=72standard deviation(σ)=10

Q: How many standard deviations to either side of the mean must we go to ensure that, for any data set,…

A:

Q: Given a sample with s = 8.5 and n = 21. Estimate the population standard deviation with 90% of…

A: Given that Sample size n = 21 Sample SD = 8.5 The critical values of Chi-square at 90% confidence…

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: 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: Suppose that the sample dataset of July 1 temperatures consisted of 64 observations and that these…

A: given data standard deviation s = 4 sample size n = 64

Q: How many standard deviations to either side of the mean must we go to ensure that, for any data set,…

A:

Q: For the Reese's pieces scenario, compute the standard deviation of sample taking if the size of the…

A:

Q: 11. What is the relationship between the standard deviation of the sample mean se( X), for samples…

A: Standard deviation of sample mean is also know as Standard error

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: Given the following data drawn from a population whose standard deviation is known to be 1 test to…

A: Given that  Population mean =5  Population standard deviation =1 Level of significance=0.05 Data :…

Q: Consider the data set 6             7            12          18          22 together with a sixth…

A: Given Data set   6, 7, 12, 18, 22, x   Mean=6+7+12+18+22+x6=65+x6∑xi2=62+72+122+182+222+x2=1037+x2

Q: For the Reese's pieces scenario, compute the standard deviation of sample taking if the size of the…

A: Answer - For the Reese's pieces scenario, the size of the samples is n =  200 and the proportion of…

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: 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: 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: Given the population 1,3,4,6, and 8. Suppose samples of size 3 are drawn from this population. 1.…

A: Population mean is the average of the dataset which is computed by dividing the sum of observations…

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: If an entire population with μ = 60 and s = 8 is transformed into z-scores, then the distribution of…

A: Given X~N(μ,σ) population mean μ=60 population standard deviation σ=8 The formula for a…

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

A: Normal distribution is a continuous distribution which has many real life applications. Normal curve…

Q: With a sample of 62, a population mean of 29, and a standard deviation of 9, what is the standard…

A: Givensample size(n)=62population mean(μ)=29standard deviation(σ)=9

Q: 4) According to one pollster, 59 % of people are afraid of flying. Suppose that a sample of size 26…

A:

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

A:

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: 10) The weights of a large population of male students have a mean of 160 pounds with a standard…

A: Solution

Q: (b) Use a 99% confidence interval to estimate the mean percent change in the population. FILE O…

A: (b) The mean percent is, x¯=∑xn=-4.7-2.5-4.9-2.7+⋯-5.147=-168.647=-3.5872 The mean percent is…

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: If a sample of size 16 is selected from a population that follows a normal distribution with mean 32…

A: Given If a sample of size 16 is selected from a population that follows a normal distribution with…

Q: 7.13 Car insurance savings. A market researcher wants to evaluate car insurance savings at a…

A: It is given that confidence level is 0.95, standard deviation is 100 and margin of error E is 10.

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

A:

Q: 10. If you have a sample of n=25, what is the standard error if the population standard deviation is…

A: The standard error of a statistics is shows the standard deviation of a estimate of a parameter and…

Q: The following data was collected during the Framingham Heart Study. Is there a statistically…

A: The sample size is sufficiently large. So, can use the standard normal distribution.

Q: If the number of degrees of freedom for a chi-square distribution is 32, what is the population mean…

A: We have given that,  Number of degrees of freedom from chi- square distribution (df) = 32  Then, We…

Q: Which of the following variables is/are needed to determine the appropriate size of the sample? I.…

A: Solution

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 have a sample of n=25, what is the standard error if the population standard deviation is σ =…

A: The standard error of the sampling distribution of the sample mean.

Q: 12.What is the sample size needed if the margin of error is 30 and the standard deviation of 45 with…

A: (12)  We have given that,  Confidence level (C.I) = 98% , standard deviation (σ) = 45 and margin of…

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

A:

Q: 15. The standard deviation of all possible sample means equals

A: Our Aim is to tell what is equals to the standard deviation of all possible sample means ?

Q: The following are grade point averages measured in a sample of 8 undergraduate students who are…

A: Solution: Let X be the grade point average. The given data is 3.28, 2.97, 3.05, 3.61, 3.39, 2.95, 3…

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: Consider a sample with a mean of 30 and a standard deviation of 5. Use Chebyshev’stheorem to…

A: Empirical rule is used to estimate the percentage of data in an interval of normal distribution. The…

Q: Consider the following figures. 8.6  7.1  8.6  8.2  8.8 8.2  7.4  8.5  8.1  8.4 the numerical…

A: Given,sample size(n)=10sample mean(x¯)=8.19stanadard deviation(s)=0.5446degrees of…

Q: Assuming the sample mean and standard deviation are indicative of the class as a whole, in what…

A:

Q: Given the situation or problem, determine what is being asked. A random sample of size n = 16 was…

A: Givensample size(n)=16Mean(μ)=32standard deviation(σ)=5

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.