Determine the sample size for the estimate of µ for the following: a) E=1.67, o = 11.44, b) E=0.55, o = 2.39, c) E=2.5, level of confidence = 98% %3D level of confidence = 95% o = 9.26, level of confidence = 99% %3D
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- Using the following data, find the t-critical value and record the lower and upper limits: Sample size: 20 Mean: 23.93 Standard deviation: 12.26 Standard error: 2.74 Confidence Interval: 95% Level of Significance: 0.05Determine the margin of error for the confidence interval for the mean: 61<µ< 86 The margin of error is3) Estimating the Mean: Unknown Variance a) A student is working on his science fair project concerning the average height of a certain native plant, which he believes is normally distributed. He finds 25 mature plants and measures their heights, and determines the average height to be 10.2 cm (s = 1.2 cm). Construct a 96% confidence interval on the mean height of the plants. .<μ<.
- Find the critical value x²R corresponding to a sample size of 19 and a confidence level of 99 percent. X²R = (Round to 3 decimals)The p-value for a t-statistic was .008. What is the best way to report the level of significance? p<.008 p<.05 p<.01 p<.001An automobile manufacturer wants to estimate the mean gasoline mileage that its customers will obtain with its new compact model. How many sample runs must be performed so that the estimate is accurate to within 0.5 mpg at 98% confidence? Assume that ? = 2
- Use the margin of error of 5, confidence level of 98%, and o=30, find the minimum sample size required to estimate a normal distribution population mean µ.omeb... Kaiser Permanent... /courses/27422/discussion_topics/357765 F2 W Instructions 30F Required parameters: Confidence level: F #3 0.95 Standard deviation: 7.9 E Number of Hours Worked An economic researcher is collecting data about grocery store employees in a county. The data listed below represents a random sample of number of hours worked by 40 employees for several grocery stores in the county. Assume that the population standard deviation is 7.9 hours. An economics researcher wants to estimate the mean number of hours worked by all grocery store employees in the county. How many employees must be included in the sample to be 95% confident that the sample mean is within 1.5 hours of the population mean? 30, 26, 33, 26, 26, 33, 31, 31, 21, 37, 27, 20, 34, 35, 30, 24, 38, 34, 39, 31, 22, 30, 23, 23, 31, 44, 31, 33, 33, 26, 27, 28, 25, 35, 23, ,32, 29, 31, 25, 27 Find the minimum sample size to estimate the population mean hours worked using StatCrunch. 1. Enter data in…find out the confidence interval for population proportion for given data [ 4 decimal places ] population standard deviation =4 xbar = 123.5 sample size= 100 c= 0.95
- Determine the sample size required to estimate a population mean to within 11 units given that the population standard deviation is 50. Use a confidence level of 95%. Sample Size =Total plasma volume is important in determining the required plasma component in blood replacement therapy for a person undergoing surgery. Plasma volume is influenced by the overall health and physical activity of the individual. Suppose that a random sample of 45 male firefighters was tested and the sample mean was 37.5 ml/kg. Assuming that the population standard deviation for the distribution of blood plasma is 7.5 ml/mg. Find a 99% confidence interval for the mean blood plasma volume in male firefighters.An advertising executive wants to estimate the mean weekly amount of time consumers spend watching traditional television daily. Based on previous studies, the standard deviation is assumed to be 26 minutes. The executive wants to estimate, with 99% confidence, the mean weekly amount of time to within ±5 minutes. The sample size required for 99% confidence is?