How large of a sample size is required?

Q: Find the Zc value for a 92% confident interval when the sample sizes 27

A:

Q: The required sample size is (Round up to the nearest whole number as needed.) Does the sample size…

A: Sample mean is within 0.014 of the population mean, Margin of error=0.014 At 98% confidence…

Q: Sample size is larger if

A: Sample size is large if we can make statement for population from it.

Q: A geologist weighs a rock several times on a sensitive scale. Each time, the scale gives a slightly…

A: A geologist weighs a rock several times on a sensitive scale. Each time, the scale gives a slightly…

Q: Based on that, the required sample size to estimate the population mean is equal to?

A: It is given that Margin of error E = 4 Level of confidence = 95% Population SD = 29 The critical…

Q: Find the sample size using the range rule of thumb to estimate a.

A: Given : Highest observation=155 bpm Lowest observation=35 bpm Margin of error=E=3 bpm Significance…

Q: In order to estimate the population proportion with a high school education,  you need a minimum…

A: It is given that margin of error (E) is 0.07 and the confidence level is 0.95.Here,

Q: Use the ogive to the right to approximate the sample size.

A: Given: The approximate sample is given as,

Q: The required sample size equals:

A: It is given that, H0: μ = 13.50 Vs. H1:  μ>13.50. The sample mean based upon some sample size =…

Q: Which of the following is NOT necessary to determine how large a sample to select from a population?

A: question:

Q: n. How large of a sample size is required?

A: here MOE  = 0.03 p =0.28 z critical for 95% confidence level = 1.96 s

Q: A sample selected by taking the members of the population that are easiest to reach is called a…

A: Convenience samplingA sample that is made up by people that are easy and very convenient to reach is…

Q: To obtain a smaller margin of error: choose a larger sample size. choose a smaller sample size.

A: The objective is to choose the correct answer for obtaining a smaller margin of error.

Q: A rowing team consists of five rowers who weigh 152, 159, 162, 150 and 156 pounds. Find all possible…

A: The formula for combination is nCr = n! / [r! (n – r)!] = [n (n – 1) … (n – r + 1)]/r!. Explanation:…

Q: What information do you need to decide on a sample size that will provide adequate statistical…

A: Adequate statistical power is the power of probability with the rejected null hypothesis. Generally,…

Q: what is the finite population correction factor if the size of the population is 250 and the sample…

A: Given: Size of population (N) = 250 Sample size ((n) = 20

Q: The appropriate interval width for a random sample of 100 observations that fall between 50 and 250…

A: We need to use concept of class intervals and number of classes

Q: According to the CLT, the standard error A. decreases, gets smaller as the sample size n B.…

A: We have given that, According to the CLT, the standard error__as the sample size n __ We have to

Q: identify two methods for obtaining a simple random sample

A: The two methods for obtaining a simple random sample are:Lottery method: In this method of random…

Q: What sample size should you gather to achieve a 0.7 hour margin of error?

A: here given , population standard deviation  = 4.2 hour  confidence level = 99% MOE  = 0.7

Q: What is the value of the finite population correction factor given a population consisting of 1, 2,…

A: Solution-: Given: sample size =3 Population data: 1,2,3,4,5 So, Population size=5  we find the value…

Q: The total population of a study is given at 500. the required sample size is 125. Determine the…

A: Given N=500, n=125

Q: Since the sample size is always smaller than the size of the population, the sample mean O A. can be…

A: Correct answer is (A)

Q: Male penguins that weigh more than 4710 grams are considered "desirable" because the extra fat means…

A: We need to find expected value of desirable penguins Let us find out probability of a desirable…

Q: Give an example of computing an appropriate sample size using the length of the interval.

A: Solution : Formula for computing sample size using the length of interval is, n = Zα2σd2 where , σ =…

Q: What test can we use to determine the sample size needed?

A: Confidence intervals for a parameter take the following general form: Point Estimate ± Margin of…

Q: If we would like to decrease the margin of error without changing the sample size, what must happen?

A: We have to find what to do to decrease margin of error.

Q: The minimum sample size needed is Is this sample size practical?

A: In the table the minimum samples sizes are given for various situations.

Q: How many possible samples of size 5 are possible from a population of size 70?

A: Combination Rule: The arrangement of r objects from n different objects is given by:

Q: According to the text, a researcher studied the effects of concentrations of lead on the life…

A: Sampling is a way of selecting cases from a population.

Q: Pull sample with return? Pull sample without return with no arrangement? Pull sample without return…

A: Given: Population: A , B , C ,D  sample size =2

Q: what sample size should be used?

A: Given :  Margin of error=E=3%=0.03 Significance level=α=0.05 Since , the estimate of the population…

Q: Is the sample size of survey is multiplied by 100, then by what factor is the margin of error…

A: Solution

Q: Use the finite population correction factor since the sample size is more than 5% of the population…

A:

Q: Determine the minimum sample size required when you want to be 90​% confident that the sample mean…

A:

Q: When a sampling technique introduces a considerable amount of bias, increasing the sample size will…

A: Given:- In a sampling technique, a considerable amount of bias is introduced.  Increasing the sample…

Q: A researcher selects all of the possible samples with n = 8 scores from a population and computes…

A: The mean of the sampling distribution of the sample mean is an unbiased estimator for population…

Q: If the sample size is increased, then the standard error for sample means also increases. True

A: The formula for calculating the Standard error is σ_x̄ = σ/√n

Q: a) Compute the population mean of the patients' age. b) Construct a table for a sample means of size…

A: 38,48,50,84 a) Mean=Sum of observations/No: of observations =38+48+50+84/4 =220/4 =55

Q: Use the ogive to the right to approximate the sample size. 券

A: Result: In frequency distributions, the largest cumulative frequency value gives the the total…

Q: To estimate the population mean µ with a 85% error margin of 2.5 units, 10) one has determined that…

A:

Q: A rowing team consists of five rowers who weigh 152, 159, 162, 150 and 156 pounds. Find all possible…

A: Given: Weights of five rowers- 152,159,162,150,156 Sample size, n=3

Q: he required sample size is. Round up to the nearest whole number as needed.)

A: It is given that confidence level is 0.98, population standard deviation is 17.8 and the margin of…

Q: A marine biologist wants to estimate the average weight of a population of dolphins living in a…

A: Note: the options for the answers are not given. So, the answer is written in assumption. In order…

Q: ٩.In a chi square goodness of fit test, a variable has 6 categories, and the sample size is 16.…

A:

Q: If the probability of committing a Type I error for a given test is decreased, then for a fixed…

A: As probability of type I error decreases, probability of type I error increases.

Q: Use Table, to draw a random sample (without replacement) of size 5 from a population of 24 units.

A:

Q: How many blocks were used in this experiment?

A: Given that number of levels k = 5 We have to find number of blocks b

Q: The minimum sample size needed is

A: Given Table:

Q: Is sampling always reliable?

A:

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.