num sample size required is computer users. major obstacle to getting a good estimate of the population mean?

Q: In interval estimate statisticians use sample statistics to estimate population parameters.

A: We have  to find the statement is true or false..

Q: ow can I change it to a representative sample

A: In convenience sampling, the individual samples are easily determined and do not depend on…

Q: What is a sample mean? What is a sample proportion? Summarize the notation used for these…

A: Sample mean : It is sum of all observation in the sample divided by total number of observations.…

Q: Why can't you just use the sample mean to estimate the population mean without including a margin of…

A: Why can't you just use the sample mean to estimate the population mean without including a margin of…

Q: You wish to estimate, with 90% confidence, the proportion of tablet owners who use their tablets…

A: Solution: 1. From the given information, confidence level is 0.90 and E=0.02. Since the proportion…

Q: Use the random sample data to test the claim that the mean travel distance to work in California is…

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Q: The absolute difference between the population mean and the sample mean is called the

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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: A point estimate for the sample mean is: (select one) O ME, Margin of error Oz, Z – score - Os,…

A: A single-valued best estimate of an unknown population parameter which is obtained using sample data…

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

A: Given Data: Margin of error=1  σ=10.4   z-score corresponding to 90% Confidence level=1.645   Let n…

Q: Consider a simple poll that is measuring the proportion of citizens that hold a particular political…

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Q: Explain why populations are sampled and describe four methods to sample a population.

A: The population consists of all the data points and usually populations are very large. A sample is a…

Q: Decide if the following statement are true or false.  If the statement is false, please correct it.…

A: Given statement is : The sample mean is denoted by ?μ and is a point estimate for the population…

Q: Using this data, make assumptions (large sample)

A: Proportion of two sample is calculated using z test. In the proportion of two sample has sample size…

Q: What is the size of the sample: What is the size of the population:

A: HERE GIVEN INFORMATION ABOUT POLITICAL SCIENTIST SURVEY. SO DERIVING VALUE OF SAMPLE SIZE AND…

Q: The fuel consumption rate of 10 vehicles is sampled. The rates, measured in miles per gallon, are…

A: Here we need to find the best estimate for the population mean for the fuel consumption of vehicles.…

Q: The chancellor wants you to calculate the largest sample size needed with a margin error of 5% and…

A: When we don't have any prior information about the population proportion, we generally take it as…

Q: Is it reasonable to treat the following as a sample from an approximately normal population?…

A: The histogram of relative frequencies is given.

Q: What is implied population?

A: For a sampling, we first have to define a population of interest then we have to use a sampling…

Q: A professor is curious about the IQ of students at the Mindanao State University. The entire group…

A: We tell the entire group students is an example of a  Note: According to bartleby experts question…

Q: What is formula for sample mean?

A: The sample mean is also known as the average of the sample. The sample mean is a measure of central…

Q: List three reasons why samples are used in statistics

A: Solution: Population is the entire set of units under study. Sample is the subset of population.

Q: What is the test statistic for this sample? (Report answer accurate to three decimal places.) test…

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Q: when we are performing a hypothesis testing for a population mean, if the sample size is small, what…

A: For hypothesis testing of the population mean of the small samples (<30) t-statistic is used.…

Q: Describe about the z TEST FOR A POPULATION MEAN.

A: Z-test for significance of a single mean: The z-test is appropriate when population standard…

Q: Determine the sample size if o = 6, population mean = 25, sample mean = 23 and the desired degree of…

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Q: How do the sample mean and the population mean differ? What is the symbol for each type of mean?

A: Here we have to define  How do the sample mean and the population mean differ? and  What is the…

Q: Based on the histogram above, what is the class width? Class width = What is the sample size? Sample…

A: from the given frequency histogram

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: Arandom sample of size 32 yielding a sample mean of 75 or more

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Q: What is the mean of a sampling distribution? Describe how to calculate it.

A: We need to find mean of sampling distribution

Q: Explain why the margin of error determines the accuracy with which a sample mean estimates a…

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Q: What is a sampling distribution of means and what does the standard error of the mean (STEM)…

A: Here we explain the sampling distribution for mean.

Q: What symbol is used for the arithmetic mean when it is a sample statistic? What symbol is used when…

A: When we calculate the arithmetic mean of a sample or as a sample statistic, it is represented as x¯.…

Q: Describe the EFFECT OF SAMPLE SIZE.

A: In general, large sample size is required to get more precision of data. Sample size plays important…

Q: What is the p-value for this sample ? ( Report answer accurate to four decimal places.)  p-value=

A: Introduction: For the given notations, the t-test statistic is: t = (M – μ) / (SD/√n).

Q: Why is sampling often preferable to conducting a census for the purpose of obtaining information…

A: Taking a sample is speedy and more cost effective than carrying out a census, and more knowledge…

Q: What are the practical Reasons for learning how to use the formula in determining sample size?

A: The two major factors affecting the power of a study are the sample size and the effect size A…

Q: True or False? When calculating the sample size for a research study, a researcher should always…

A: Sample size, n: The sample size represents the number of observations in the sample. It is denoted…

Q: A numerical value used as a summary measure for a sample, such as sample mean, is known as a O…

A: Population parameter: Any numerical value that measures the features of population, is called as a…

Q: the number of observations and measurements taken is the sample size True or False

A: We have given that, the number of observations and measurements taken is the sample size?  True or…

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: How much "error" is too much before you are no longer confident about your estimates or research…

A: Given information: Margin of error is defined as the half the width of the confidence interval.

Q: What is the mean population?

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Q: What is the standard error of the sample mean if your sample size is 36? Give your answer to 2…

A: It is given that  Population standard deviation, σ = 4.8 Sample mean, x̅ = 25.9 Sample standard…

Q: USA TODAYT reported that Americans spend 4.1 hours per weekday checking work email. This was an…

A: Given Information: Americans spend 4.1 hours per weekday checking work email. This was an estimate…

Q: Explain step by steb  Consider your clan (family and relatives) as the population. List the members…

A: Sampling is nothing but the technique of selecting individual members from of the…

Q: Your goal is to estimate a population proportion with a sample size n = 700 and the sample…

A: Here check condition use z critical for confidence interval of population proportion

Q: Based on the result above, can we say that the die is balanced? Use level of significance= 0.01

A: We will use Chi squares goodness of fit test to test that the die is unbalanced.