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: I am having problems calculating the population variance. I am okay for the first 4 steps in the…

A: Variance tell us about the spread of the data distribution. Population variance tell us about how…

Q: an IQ test is designed so that the mean is 100 and the standard deviation is 16 for the population…

A: Given that, μ=100σ=16Margin of error=E=4α=0.1The critical value at α=0.1 is zα/2=1.645

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: Sample size is larger if

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

Q: How can we know that the sample size of A is less than B? The sample size of both is not stated in…

A: Here we have to explain How can we know that the sample size of A is less than B

Q: Suppose that the pulse rates of adult males vary from a low of 30 bpm to a high of 110 bpm.  Assume…

A: pulse rates of adult males vary from Low =30 bpm High=110 bpm confidence level=95% Margin of…

Q: You want to obtain a sample to estimate a population proportion. At this point in time, you have no…

A: Given Information: Confidence level = 80%  Error (e) = 0.05 Proportion (p) = 0.5 (assumed)  The z…

Q: To obtain a maximum amount of variance, an item ought to have a degree of difficulty of what?

A: To obtain a maximum amount of variance an item ought to have a degree of difficulty is the number of…

Q: A recent study found that the life expectancy of a people living in Africa is normally distributed…

A: From the provided information,

Q: If the population variance of the lifetime of a light bulb is 10000 hours, how large of a sample…

A:

Q: If all the possible random samples of n=81 scores are selected from a normal population with u=80…

A:

Q: How many different simple random samples of size 4 can be obtained from a population whose size is…

A: The following information has been provided: The total number of elements are n=10. The sample size…

Q: 100 samples were obtained from a normal population with means = 50, variance = 4 and confidence…

A: Given: 100 samples having a normal distribution with μ=50 and σ2=4 is given. The confidence interval…

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

A:

Q: An IQ test is designed so that the mean is 100 and the standard deviation is 22 for the population…

A:

Q: When a sample size from the population is n=1 than the standard error will always equal the

A: Given, Sample size from the population is n = 1

Q: True or false For a single sample t‐test against a specified reference mean, the degrees of freedom…

A: We have given that For a single sample t‐test against a specified reference mean, the degrees of…

Q: Eagle flu can be devastating for those who are hospitalized. Researchers at JJ Health Services took…

A: Requirements for Binomial Distribution:   The Binomial distribution is useful if the experiment has…

Q: A researcher wishes speeders who exceed the posted speed limit on a particular stretch of road in…

A: Given that the confidence level is 98% Therefore, the significance level is 1-confidence…

Q: We want to estimate a population mean u of a population with a standard deviation s=12. What size…

A: We have given that,  Population standard deviation (σ) = 12, confidence interval (c.i) = 95% = 0.95…

Q: Why do we use 1/4 in place of p(1 - P) in the formula below for sample size when the probability of…

A:

Q: If the population variance of the lifetime of a light bulb is 10000 hours, how large of a sample…

A: Given: The population variance of the lifetime of a light bulb is 10000 hours, and a sample must be…

Q: A sample of final exam scores is normally distributed with a mean equal to 20 and a variance equal…

A:

Q: rationale for using n – 1 to compute the sample variance

A: we divide by 'n' to get the population variance.

Q: What is the probability that the mean of a sample with 40 elements randomly selected from a normally…

A:

Q: An IQ test is designed so that the mean is 100 and the standard deviation is 19 for the population…

A: State the given values, The z value at 99% confidence level is:

Q: Eagle flu can be devastating for those who are hospitalized. Researchers at JJ Health Services took…

A: From the given information, Sample size (n) =2561 X = 1497 Consider, p be the (unknown) true…

Q: If all 24 samples from a population produce the same age x = 20, what are the sample meanµ and the…

A: All 24 samples from a population produce the same age x=20. That is each xi=20 then

Q: Eagle flu can be devastating for those who are hospitalized. Researchers at JJ Health Services took…

A: The confidence interval for proportion is as follows: The length of the confidence interval is as…

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: The length of time for a college applicant to complete the college achievement test is normally…

A: Given: Mean = 70 minutes Variance = 144 min2 To find: The probability of selecting an applicant at…

Q: A hypothesis test based on a simple random paired sample is to be performed to compare the means of…

A: The paired difference has the outliers.

Q: An IQ test is designed so that the mean is 100 and the standard deviation 13 is for the population…

A: The sample mean is within 7 IQ points of the true mean and population standard deviation is 13.…

Q: A population is normally distributed and has a mean of 50 and a standard deviation of 5 If we…

A: As we know the empirical rule of 68 - 95 - 99.7 that is the percent value that are one, two or three…

Q: If X is a binomial random variable with n = 15 and p = 0.3, we can use the normal approximation? О…

A:

Q: An iq test is designed so that the mean is 100 and the standard deviation is 21 for the population…

A:

Q: The personality variable extraversion is normally distributed in the population and has a mean of 10…

A:

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

A: Statements are given.

Q: If the population standard deviation is unknown, then we could use the sample standard deviation to…

A: We have given that the statement about the standard error of the mean. The formula of standard error…

Q: The degree of freedom for chi squared test of a contingency table, with 6 rows and 4 columns…

A: Answer: From the given data, number of rows (r) = 6 number of columns (c) = 4

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.