Using traditional methods it takes 94 hours to receive an advanced driving license. A new training technique using Computer Aided Instruction (CAI) has been proposed. Aresearcher used the technique on 120 students and observed that they had a mean of 92 hours. Assume the population standard deviation is known to be 8. Is thereevidence at the 0.05 level that the technique reduces the training time?Step 4 of 6 Find the P-value of the test statistic. Round your answer to four decimal places.

Given information:- μ0 (hypothesized mean) = 94- x̄ (sample mean) = 92- n (sample size) = 120- σ…

Answered: Using traditional methods it takes 94…

ENGR.ECONOMIC ANALYSIS

14th Edition

ISBN:9780190931919

Author:NEWNAN

Publisher:NEWNAN

Chapter1: Making Economics Decisions

Section: Chapter Questions

Problem 1QTC

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Question: Godrej soap manufacturing company was distributing a particular brand of soap through a large number of retail shops. Before a heavy advertisement campaign, the mean sales per week per shop was 140 dozens. After the campaign, a sample of 26 shops was taken and the mean sales was found to be 147 dozens with standard deviation 16. Can you consider the advertisement effective?
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An insurance agent claims that the average age of Age last Number of policy-holders who insure through him is less than the average age for all birthday (yrs) the agents, which is 30-5 years. A random sample of 100 policy-holders who had insured through him gave the adjoining age distribution. Calculate the mean and standard deviation of the sample and use it to test the claim that the average is less than the figure for all the agents at 5% level of significance persons 16-20 12 21-25 22 26 30 20 31-35 30 36-40 16
Bob Nale is the owner of Nale’s Quick Fill. Bob would like to estimate the mean number of gallons of gasoline sold to his customers. Assume the number of gallons sold follows the normal distribution with a population standard deviation of 1.80 gallons. From his records, he selects a random sample of 80 sales and finds the mean number of gallons sold is 6.90. What is the point estimate of the population mean? (Round your answer to 2 decimal places.) Develop a 95% confidence interval for the population mean. (Use z Distribution Table.) (Round your answers to 2 decimal places.)
Please see attachment and type out the correct answer with proper explanation of it. Will give you upvotes
Question: In a survey of buying habits, 400 women shoppers are chosen at random in super market 'A' located in a certain section of the city. Their average weekly food expenditure is dollar 250 with a standard deviation of Dollar 40. For 400 women shoppers chosen at random in super market 'B' in another section of the city, the average weekly food expenditure is Dollar 220 with a standard deviation of Dollar 55. Test at 1% level of significance whether the average weekly food expenditure of the two populations of shoppers are equal.
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A large milling machine produces steel rods to certain specifications. The machine is considered to be running normally if the standard deviation of the diameter of the rods is at most 0.42 millimeters. The line supervisor needs to test the machine is for normal functionality. The quality inspector takes a sample of 45 rods and finds that the sample standard deviation is 0.49. What is the test statistic? Select one: а. 59.89 b. 48.63 с. 50.50 d. 52.45
The standard deviation of the scores on a skill evaluation test is 363 points with a mean of 1239 points. If 335 tests are sampled, what is the probability that the mean of the sample would differ from the population mean by less than 23 points? Round your answer to four decimal places.
A simple random sample of 8 employees of a corporation provided the following information. Employee Age Gender 1 2 3 21 37 26 W M W 4 5 6 7 8 44 48 50 25 22 W W M M M (a) Determine the point estimate for the average age of all employees. (b) What is the point estimate for the standard deviation of the population? (Round your answer to four decimal places.) (c) Determine a point estimate for the proportion of all employees who are female.
A lathe is set to cut bars of steel into lengths of 6 centimeters. The lathe is considered to be in perfect adjustment if the average length of the bars it cuts is 6 centimeters. A sample of 121 bars is selected randomly and measured. It is determined that the average length of the bars in the sample is 6.08 centimeters with a standard deviation of 0.44 centimeters. Compute the p-value for testing whether the population mean is larger than 6 centimeters. NOTE: WRITE YOUR ANSWER WITH 4 DECIMAL DIGITS. DO NOT ROUND UP OR DOWN.

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