An industrial designer wants to determine theaverage amount of time it takes an adult toassemble an "easy to assemble" toy. A sample of 16times yielded an average time of 19.92 minutes, witha sample standard deviation of 5.73 minutes.Assuming normality of assembly times, provide a90% confidence interval for the mean assemblytime.A) 19.92 ± 3.04В19.92 + 2.51(c) 19.92 ± 3.05C19.92 ± 2.81

Given,sample size(n)=16sample mean(x¯)=19.92sample standard deviation(s)=5.73degrees of…

Answered: An industrial designer wants to…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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In a random sample of 27 people, the mean commute time to work was 31.3 minutes and the standard deviation was 7.3 minutes. Assume the population is normally distributed and use a t-distribution to construct a 90% confidence interval for the population mean u. What is the margin of error of µ? Interpret the results. The confidence interval for the population mean is (OD. (Round to one decimal place as needed.) The margin of error of u is (Round to one decimal place as needed.) Interpret the results. O A. It can be said that 90% of people have a commute time between the bounds of the confidence interval. B. With 90% confidence, it can be said that the population mean commute time is between the bounds of the confidence interval. C. With 90% confidence, it can be said that the commute time is between the bounds of the confidence interval. D. If a large sample of people are taken approximately 90% of them will have commute times between the bounds of the confidence interval.
A very large company is interested in its employees' productivity. The company reports from its historical data that its employees spend a mean of 164 minutes per employee (on a typical day) dealing with email. To test this claim, an independent consultant chooses 26 employees at random and finds that those employees spend a sample mean of 172 minutes dealing with email, with a sample standard deviation of 21 minutes. Assume that the population of amounts of time employees spend dealing with email is approximately normally distributed. Complete the parts below to perform a hypothesis test to see if there is enough evidence, at the 0.05 level of significance, to reject the claim that u, the mean number of minutes employees spend dealing with email, is equal to 164. (a) State the null hypothesis H, and the alternative hypothesis H, that you would use for the test. Ho: I H: OSO D=D (b) Perform at test and find the p-value. Here is some information to help you with your t test.
A research group wishes to estimate the mean number of hours that high school students spend watching TV on a weekday. A margin of error of E=0.15 hour is desired. Past studies suggest that a population standard deviation of σ=2.2 hours is reasonable. Estimate the minimum sample size required to estimate the population mean with 95% confidence. The required sample size is ___?
1. The impact rebound values of n=15 pieces of rock, randomly selected from a large geological formation, have a standart deviation of 0.012. Assuming that these measurements can be looked upon as a sample from a normal population , construct a %95 confidence interval for 6, the standart deviation of the population sampled
A sample of stalactites (a type of rock formation) found in a glow worm cave produced the following lengths in cm: 9.6 16.9 15.1 14.3 15.9 17.2 13.0 17.1 15.4 16.2 4.5 20.3 21.2 15.7 Assuming that this sample came from a normal population, calculate a 95% confidence interval for the mean length of stalactites in the cave.
An electronics production sequence includes a process where a film of metal is deposited on a board. The film must be more than 1.000 mm thick. If the film is too thin the process fails. The engineer ran a test where the null hypothesis was that the mean thickness was at most 1.000 mm. A sample of 100 boards had a mean thickness of 1.007 mm and a standard deviation of 0.050 mm.At what level of significance would the null hypothesis be rejected? Express your answer at a decimal (not a percent) rounded to three places.
One method for measuring air pollution is to measure the concentration of carbon monoxide, or CO, in the air. Suppose Nina, an environmental scientist, wishes to estimate the CO concentration in Zagreb, Croatia. She randomly selects 45 locations throughout the city measures the CO concentration at each location. Based on her 45 samples, she computes the margin of error for a 95% t-confidence interval for the mean concentration of CO in Zagreb, in µg/m³, to be 4.28. What would happen to the margin of error if Nina decreases the confidence level to 90%? Nina increases the confidence level to 99%? Nina decreases the sample size to 33 locations? Nina increases the sample size to 65 locations? Answer Bank Increase Stay the same Decrease
In a random sample of twelvetwelve cell phones, the mean full retail price was $591.50591.50 and the standard deviation was $179.00179.00. Assume the population is normally distributed and use the t-distribution to find the margin of error and construct a 9090% confidence interval for the population mean muμ. Interpret the results.
A metropolitan transportation authority has set a bus mechanical reliability goal of 3,900 bus miles. Bus mechanical reliability is measured specifically as the number of bus miles between mechanical road calls. Suppose a sample of 100 buses resulted in a sample mean of 3,975 bus miles and a sample standard deviation of 275 bus miles. Complete parts (a) and (b) below.
A sample of size 78 produced the sample mean of 16.4. Assuming the population standard deviation 3.3, compute a 99%confidence interval for the population mean µ.

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