A researcher plans to select a random sample from a population with o=20 what is the minimum sample size the researcher needs to have a standard error no greater than 2 points?

Q: uppose you and a friend each take different random samples of data pairs (x,y) from the same…

A: From the given information, It is given that the different samples are taken by you and your friend…

Q: A law school with a total enrollment of 5000 students is known to have 40% women in its student…

A: Expectation:Denote π as the true population proportion of women in the law school. Hence, π =…

Q: Suppose you wish to determine the proportion of college students in NC who receive some form of…

A: Givenconfidence level=95%Margin of error(E)=0.04sample proportion(p^)=0.78

Q: The requirements for performing a one-sample t-test been met for the following reasons. The sample…

A: The objective is o define if the considered one-sample t-test is desired for testing the set-up…

Q: A simple random sample size of n=81 is obtained from a population that is skewed right with u=81 and…

A:

Q: Gary has discovered a new painting tool to help him in his work. If he can prove to himself that the…

A: We want to find conclusion

Q: The routine of a certain brand of batteries is normally distributed with a population mean of 30…

A: Let X be the random variable from normal distribution with mean (μ) = 30, standard deviation (σ) = 6…

Q: Executives of a supermarket chain are interested in the amount of time that customers spend in the…

A: a) Suppose μ is the population mean shopping time spent by customers at the supermarket.

Q: Suppose a random sample of size n will be selected from a large population with mean and standard…

A: The sample size is denoted by .The population mean is .The population standard deviation is .The…

Q: For a population with phi = 16 , how large a sample is necessary to have a standard error that is…

A:

Q: And REM rapid eye movement sleep is sleep during which most dreams occur. Each night a person has…

A: Hypotheses for the test are given below: H0:μ1=μ2H1:μ1>μ2

Q: A population has a variance of 867. We take a random sample of size 47 from this population. Let…

A:

Q: What are the boundaries for the middle 50% of all possible random samples of n = 25 scores selected…

A:

Q: Suppose X is a normal random variable with mean=5 and variance=0.5. a) If sample size = 50. P(35) =…

A: (a) The value of P3<x¯<5 is 0.5, which is obtained below:…

Q: Giselle is a personnel manager in a large corporation. Each month she must review 36 of the…

A:

Q: A sociological study conducted in a small town calls for the estimation of proportion of households…

A: Obtain the value of the true population proportion. The value of the true population proportion is…

Q: Describe the shape of the sampling distribution of x. O Since n is greater than or equal to 30 we…

A:

Q: What is the kurtosis for the distribution of scores with a mean of 9.02 and a mode of 3?

A: Given information: Mean = 9.02, Mode = 3 The distribution of right skewed distribution.

Q: Suppose that you know that a variable is normally distributed on each of two populations. Further…

A: Requirements for a pooled t-test: The samples must be independent and drawn randomly from normally…

Q: A chi-square homogeneity test is to be conducted to decide whether a difference exists among the…

A: A chi-square homogeneity test is to be conducted to decide whether a difference exists among the…

Q: We use the hypergeometric distribution in place of the binomial distribution when we are sampling…

A:

Q: A manager will switch to a new technology if the production process exceeds 80 units per hour. The…

A: Solution solution  given data μ x= 83 , n =25 , σ=8to test the hypothesis we will use ztest for…

Q: Realtors of a particular county have undertaken a research study on residents of their country who…

A: Given that Margin of error (E) = 0.015 p^ =  0.25 Level of significance (α) = 1 -0.99 = 0.01

Q: You are working on a political campaign and you want to take a sample to determine your candidate’s…

A: From the given information , determine the sample size using margin of error with 95% of confidence…

Q: The exercise hours dataset contains information on the amount of exercise (hours per week) for a…

A:

Q: b) What is the minimum sample size needed to estimate the true proportion of adults who watch…

A: Given: Confidence interval =99% Level of significance, α=0.01 Standard error, e = 0.04 p = 0.5 from…

Q: Calculate the minimum sample size that you must have to meet these requirements.

A: Let p be the pop. prop. of college students in the state who receive the form of financial aid.Given…

Q: Suppose that the population mean flight time between cities 1 and 2 is 240 minutes with a population…

A: Given that.   X~N( μ , ?^2 )   μ=240     , ?=20   Z-score =( x - μ )/?

Q: A chi-square homogeneity test is to be conducted to decide whether four populations are…

A: The test for homogeneity determines if two or more populations (or subgroups of a population) have…

Q: The U.S. Census Bureau estimates that American workers spend and average time of 27 minutes travel…

A: Introduction: For the data set, the minimum value is, Minimum = 6.6 minutes, and the maximum value…

Q: Compute the value of the test statistic

A: For population 1, sample size n1 = 6, sample mean = 3.8 and sample SD = 0.2 For population 2, sample…

Q: Suppose that random samples are drawn from an infinite population. How does the standard error of X…

A: The standard error of the mean (X¯) is given by the formula:   SE = s/√n,   where s is the sample…

Q: dataset x = (x1, … , xn ) has sample variance of 0 when (n≥2 ). prove that all the data points are…

A: This problem is based on the sample variance and data sets.   To show -  If sample variance is zero…

Q: For a population with σ=16, how large a sample is necessary to have a standard error that is…

A:

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: A sample of 28 students will be normally distributed if taken from a normal population. TRUE OR…

A: Statements are given.

Q: Consider a random sample drawn from the normal distribution with mean μ and variance o2. The maximum…

A: Consider a random sample drawn from the normal distribution with mean μ and variance σ2. The maximum…

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.