if the sample mean is 10, the population standard deviation is 20, and the sample size is 25, then the standard error is?

Q: A professor is trying to find the average exam grade in his class. The sample mean should be within…

A: It is given that confidence level is 0.90, standard deviation is 12 and margin of error E is 5.

Q: When the sample size is over 30, when would the t test be used instead of normal distribution?

A: A t test will be used, when the population standard deviation is unknown and either the population…

Q: Among those taking the Graduate Record Exam, 18 people are randomly selected. This group had a mean…

A: n = 18 s =140 mu = 550

Q: if a sample n = 16, mean = 10.3,standard deviation is 2.6. calculate a 95% confidence interval.

A:

Q: When calculating the confidence interval for a population mean, which distribution is used?

A: Confidence interval for mean: When the sample size is large (n>30) and population variance (or…

Q: An article in a local town newspaper discusses the results of state test scores in their town. The…

A: Answer:-

Q: An article in a local town newspaper discusses the results of state test scores in their town. The…

A: Hello! As you have posted more than 3 sub parts, we are answering the first 3 sub-parts.  In case…

Q: Use the values below to compute the sample standard deviation. Please show work.

A: The sample standard deviation is denoted by s. The formula for the sample standard deviation (s) is…

Q: In a random sample of nine people, the mean driving distance to work was 25 miles the sample…

A:

Q: A simple random sample of 400 individuals provides 100 Yes response.  What is the estimate of the…

A: We know that,  If P is population proportion and  p^ is sample proportion then standard error of…

Q: A professor is trying to find the average exam grade in his class. The sample mean should be within…

A: Determine the value of sample size n. The value of sample size n is obtained as shown below: Use…

Q: A normal population distribution has a sample mean of μ = 65. What is the expected value of the mean…

A: Solution: It is given that a normal population distribution has a sample mean of 65.  Standard error…

Q: Among those taking the Graduate Record Exam, 18 people are randomly selected. This group had a mean…

A:

Q: The Statistics Games are played by a large number of teams across the county. Teams raise money to…

A: We have given that,  Sample mean (x̄) = $ 375, standard deviation (s) = $ 32 and sample size (n) =…

Q: When calculating the confidence interval for a population mean, we should use a normal distribution…

A: According to the central Limit theorem The mean of sample following the normal distribution as the…

Q: If the standard deviation is increased and the sample size and the confidence level stay the same,…

A: Error=Z×σn where σ: standard deviation             Z: z-score for the given confidence level…

Q: for a normal distribution with a population mean of 74 and a standard deviation of 8, what is the…

A: given data normal distributionμ = 74σ = 8to saperate top 60% x = ?

Q: To estimate u, the mean salary of full professors at American colleges and universities, you obtain…

A: Mean = 73220Standard deviation = 4400Sample size = 400

Q: for a sample of 150 that has a mean of 6540 and a standard deviation of .89, calculate the 95%…

A: It is given that mean and standard deviation are 6,540 and 0.89, respectively.

Q: FIND 90% CONFIDENCE INTERVAL FOR THE DIFFERENCE IN POPULATION PROPORTIONS Pf -Pm .

A:

Q: What effect does increasing the sample size have on the population standard deviation? I know that…

A: The increase in the size of the sample, decreases the population standard deviation. This happens…

Q: Home prices in a city have mean = $194,000 and standard deviation = $20,000. For n = 25 randomly…

A: population mean ()=194000standard deviation()=20000sample size(n)=25Mean()=198000

Q: Suppose the mean height in inches of all 9th grade students at one high school is estimated. The…

A:

Q: A normal population distribution has a sample mean of u=65. What is the expected value of the mean…

A: The objective is to find the expected value of the mean. From the available information ,  A normal…

Q: What is the sample standard deviation?

A: To Discuss: What is the sample standard deviation?

Q: What value of z would you use to calculate the 98% confidence interval for a population mean, given…

A:

Q: Use the sample results to approximate the margin of error and​ 95% confidence interval.   Sample…

A: Given data: Sample size, n = 64 Sample mean, x¯=69 Sample standard deviation, s=7 The degree of…

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.