Sampling variation refers to a situation when there is uncertainty associated with a parameter estimate. researchers arrive at the precisely correct answers. different random samples lead to somewhat different estimates. there is variability across observations.
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- A a measure of the uncertainty associated with a parameter estimate that results from sampling variation is referred to as the standard deviation. an upward bias. the standard error. the sampling variation.QUESTION 8 Having an extreme score in a sample (outliers) will NOT effect which of the following? standard deviation mean mode varianceA simple random sample of 8 employees of a corporation provided the following information. Employee Age Gender 1 2 3 21 37 26 W M W 4 5 6 7 8 44 48 50 25 22 W W M M M (a) Determine the point estimate for the average age of all employees. (b) What is the point estimate for the standard deviation of the population? (Round your answer to four decimal places.) (c) Determine a point estimate for the proportion of all employees who are female.
- If the E(u|X) does not equal 0. How can this assumption be relaxed if the sample size grows infinitely?What do you mean by Sample Variance, Sample Standard Deviation,and Standard Error?An estimator that is correct (i.e., it is equal to the true population parameter ) more than half of the time is unbiased. True False
- Question Help Every ten years, the census bureau asks people about the number of people living within their households. The following list shows how eight households responded to the question. 3 6 6. 3 9. 4 4 a) Calculate the range. b) Calculate the sample variance. c) Calculate the sample standard deviation.Suppose you select a random sample of 16 students from a population that has mean of µ = 75 and standard deviation of ơ = 20. You want to know what would be considered a ‘typical’ sample mean for a sample of n = 16. To answer your question, you compute the two sample means that define the middle 95% of the distribution of sample means. Show your work, sketch the distribution, and shade in the area of interest. Hint: Sample means that are in the extreme 5% of the distribution (2.5% in each tail of the distribution) are considered ‘atypical’ or ‘extreme.’Question 2 In 2015, the average duration of long-distance telephone calls from a certain town was 3.9 minutes. A telephone company wants to perform a test to determine whether this average duration of long- distance calls has changed. Fifty calls, originating from the town, was randomly selected and the following summary minutes. Σx= 205 E(x - x)? = 56.43 a) Calculate the sample mean, &. b) Calculate the sample standard deviation c) Using the p value approach at the 1% level of significance, test whether the mean duration of long-distance calls from the town had increased. d) Construct the 99% confidence interval for the population mean duration of the long-distance calls from the town.
- Bob Nale is the owner of Nale’s Quick Fill. Bob would like to estimate the mean number of gallons of gasoline sold to his customers. Assume the number of gallons sold follows the normal distribution with a population standard deviation of 1.80 gallons. From his records, he selects a random sample of 80 sales and finds the mean number of gallons sold is 6.90. What is the point estimate of the population mean? (Round your answer to 2 decimal places.) Develop a 95% confidence interval for the population mean. (Use z Distribution Table.) (Round your answers to 2 decimal places.)Consider the following data: −11,−5,−5,−11,13,−11,−5−11,−5,−5,−11,13,−11,−5 Copy Data Step 2 of 3: Calculate the value of the sample standard deviation. Round your answer to one decimal place.A random sample of eight homes in a particular suburb had the following selling prices (in thousands of dollars): 192 183 312 227 309 396 402 390 a. Check for evidence of nonnormality. b. Find a point estimate of the population mean that is unbiased and efficient. c. Use an unbiased estimation procedure to find a point estimate of the variance of the sample mean. (Hint: Use sample standard deviation to estimate population standard deviation). d. Use an unbiased estimator to estimate the proportion of homes in this suburb selling for less than $250,000.