An engineer wishes to determine the average time (in seconds) required to drill holes in some...
An engineer wishes to determine the average time (in seconds) required to drill holes in some metal flange. Determine the required sample size to be 99% certain that the sample mean will be within 15 seconds of the true average, assuming that the standard deviation of the time is o = 30 seconds. A. 26 B. 27 C. 28 D. 29 E. none of the preceding
Multiple Choice Question An engineer wishes to determine the average time (in seconds) required to drill holes in some metal flange. Determine the required sample size to be 99% certain that the sample mean will be within 15 seconds of the true average, assuming that the standard deviation of the time is o = 30 seconds. A. 26 B. 27 C. 28 D. 29 E. none of the preceding
An efficiency expert wishes to determine the average time required to drill three holes in a metal component. How large a sample is needed to be 95 percent confident that the sample mean is within 15 seconds of the true mean? Assume it is known from previous studies that σ = 40 sec.
Determine the average time (in seconds) required to perform some type of physical labor: What is the required sample size to be 99% certain that the sample mean will be within 15 seconds of the true average, if the standard deviation of the time is σ = 30 seconds?
A study is being done to determine the average commute time (in minutes) of Sac State students. A random sample of 30 individuals was drawn, and their commute times are listed below: 24 28 31 29 54 28 27 38 24 14 46 38 31 16 21 11 21 15 30 29 17 23 27 18 29 44 19 35 34 38 Construct and interpret a 99% confidence interval for the average commute time of Sac State Students.
1. An average of 32.60 seconds with a standard deviation of 2.50 was calculated from 30 observations in a time study. What is the required total sample size (including the original 30) to be 90% confident that the average is within +-1.5% of the sample mean using this data? Round up if the calculated number is not an integer. 8. In preparation for a work sampling study, work was started on determining how many observations are required to be 95%...
Question 24 A safety engineer at Abu Dhabi international airport wishes to find the 98.26% confidence interval for the average flight hours before major maintenance is required for her feet of aircrafts. The population standard deviation of the flight hours until major maintenance is 35 hours. Assuming that a sample was selected from a normally distributed population. How many aircrafts should be included in her sample to obtain a population average accurate within 18 hours? [3 Marks Question 25 A...
if I could get some help with better understanding this unit
of statistics and probability it would be great. please and thank
you!
DeroW.9 HourS? 29 Determining sample size. Refer to the previous rcise. You want to use a sample size such that about 95% of the averages fall within 5 minutes (0.08 hour) of the true mean 6.78. (a) Based on your answer to part (b) in Exercise 28 should the sample size be larger or smaller than 120?...
A manager wishes to determine whether the mean times (long or short time) required to complete a certain task differ for three levels of employee training. Each employee was selected to participate in all levels of training (Beginner, Intermediate and Advanced). The data below are the times (in minutes) each employee took to complete a certain task within each level of training. Analyze and answer the following three questions: 1. What is the F critical? 2. Is F ratio significant...