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A manufacturer uses a new production method to produce steel rods. The population standard deviation has been designed to be 3.5 cm. A random sample of 17 steel rods resulted in lengths with a standard deviation of 2 cm. At a 10% significance level, test the claim that the new production method has lengths with a standard deviation different from 3.5 cm.
State the main points of the Central Limit Theorem for a mean. Why is population shape of concern when estimating a mean? What does sample size have to do with all?
Calculate the value based on this information. A new screening test for Lyme disease is developed for use in the general population. The sensitivity (ability to identify infected persons) is 60% and specificity (ability to identify non- infected p..
What is the critical value of the Chi-square? Compute the value of Chi-square. What is your decision regarding H0?
in a certain rural area of new york state 80 of drivers use chains on the car tires for winter driving. 60 of drivers
the city council of pine bluffs is considering increasing the number of police in an effort to reduce crime. before
A study to get a quick idea of the medical acceptability of a new aspirin substitute which cannot be dispensed over the counter without prescription.
A new weight-watching company, Weight Reducers International, advertises that those who join will lose, on the average, 10 pounds the first two weeks with a standard deviation of 2.8 pounds
As an experiment, a self-confessed connoisseur of cheap popcorn carefully counted 773 kernels and put them in a popper. After popping, the unpopped kernels were counted. There were 86. a)Construct a 90% confidence interval for the proportion of all k..
In a random sample of 16 mountain climbers who are going to attempt Mt. Mckinley, what is the probability that at least 10 reach the summit?
A producer of pleasure boats wants to maximize revenue during the next month. Two types of boats are sold, x1 and x2. Type x1 sells for $40,000 and type x2 sells for $30,000. The x1 boats require 10 weeks of labor and 600 board feet of lumber each..
use the following problem to determine the binding constraints for the optimal solution. max p 30x 40y4x 2y lt16 a2x
That 95% of all daily sales fell between $19,200 and $36,400. Based on this information what were the mean sales? What was the standard deviation?
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