Chapter 08, Section 8.4, Problem 060a Determine the most conservative sample size for the estimation of the population proportion for the following. E = 0.027, confidence level = 95% Round your answer up to the nearest whole number. the tolerance is +/-5% Chapter 08, Testbank, Question 043 The Labor Bureau wants to estimate, at a 90% confidence level, the proportion of all households that receive welfare. A preliminary sample showed that 20.5% of households in this sample receive welfare. The sample size that would limit the margin of error to be within 0.032 of the population proportion is: exact number, no tolerance

If you want to construct a 90% confident interval for a population mean such that it is within a quarter (population) standard deviation from the sample mean, then what is the minimum sample size required?

Suppose that you wanted to determine a confidence interval for the number of people who will get the influenza vaccine. You construct a 95% confidence interval and find a point estimate of 128,228 and a margin of error of 5400. a. What are the requirements necessary for finding this confidence interval. Assume that we do NOT know the standard deviation for the population.b. What interval would you construct (z-interval, t-interval or proportion interval)? Assume you do NOT know the population standard deviation.c. Construct the confidence interval.

A New York Times poll asked 1,850 adults in the United States a series of questions to find out their view on the U.S. economy. The 1,850 adults make up:   the population the statistical inference the secondary data source the primary data source the sample         2. A sample of workers who completed training were asked to rate the training according to the following classification: outstanding, very good, fair, or poor. The level of measurement used is:   nominal ordinal comprehensive interval ratio       3. The following frequency distribution displays the weekly sales of a certain brand of television at an electronics store. Number Sold Frequency 1-5 3 6-10 7 11-15 14 16-20 22 21-25 4 What is the width of each class in this distribution? 1 2 5 10 25

Which type of confidence interval should you use in this situation? A sample of 25 different payroll departments found that the employees worked an average of 310.3 days a year with a standard deviation of 23.8 days. The distribution is approximately normally distributed. Find the 90% confidence interval for the average days worked of all payroll departments.   Question 2 options:   1)  a confidence interval for the mean using a table value from the standard normal distribution.   2)  a confidence interval for the mean using a table value from the t distribution.   3)  a confidence interval for a proportion using a table value from the standard normal distribution.   4)  a confidence interval for proportion using a table value from the t distribution.   5)  none of the above.

9 The standard error of the mean is, a 0.881       b 0.735       c 0.612       d 0.510

Find 90% confidence interval

Determine whether the following statements are True or False: If we increase the confidence level C, then the width of the CI decreases, i.e., the CI becomes narrower. (Hint: think about what happens to the margin of error m) Suppose the mean of a population µ = 100. If we found that the margin of error is m = 2 for level of confidence 98%, then we can be 98% confident that a sample mean (computed from a sample of the same size used to compute m) is in the interval (98, 102).

Researchers studied the mean egg length (in millimeters) for a bird population. After taking a random sample of eggs, they obtained a 95% confidence interval of (45,60). What is the value of the margin of error? Choose the correct answer below. A. 15 mm B. 52.5 mm O c. 7.5 mm O D. 1.96