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The mean number of gallons of gasoline pumped per customer at Ray's Marathon Station is 9.5 gallons with a standard deviation of 0.75 gallons. The median number of gallons pumped is 10.0 gallons. Th
AVX stereo Equipment Inc. recently began a " no-hassles" return policy. A sample of 500 customers who had currently returned items showed 400 thought the policy was fair, 32 thought it took too long
AVX stereo Equipment Inc. recently began a " no-hassles" return policy. A sample of 500 customers who had recently returned items showed 400 thought the policy was fair, 32 thought it took too long
The calculated p-value for a hypothesis test is 0.084. What decision about the null hypothesis would occur in the following: The hypothesis test is completed at the 0.05 level of significance.
A 90% confidence interval around the variance was calculated. For n = 27, the confidence interval was 35.0-88.4. Give the variance of the sample.
By Determining the amount of time it takes a component of a product to move from one workstation to the next, an engineer has estimated that the standard deviation is 3.63 seconds.
Suppose that the sample is drawn and z(?/2) = 1.96 and = 30. Answer the following questions: If the Maximum Error of Estimate is 0.04 for this sample, what would be the sample size?
The number of viewers of The Voice has a mean of 30 million with standard deviation of 10 million. Suppose this distribution follows a normal distribution.
Consider the following data set hours of radio and listend to last week and gpa
A political strategist thinks that at least 58% of voters in certain state support his candidate. He then commissions poll of 1000 voters and 60% of them support his candidate. At ? = .05, test the
A recent survey indicated that average amount spent for breakfast by business managers was $7.58 with a population standard deviation of $0.42. It was felt that breakfasts on the West Coast were hig
A study of 70 bolts of carpet showed that their average length was 150 yards. The standard deviation of the population is 6 yards. What is the 99% confidence interval for the mean length per bolt of
A report describes that 40% of home owners had vegetable garden. How large a sample is required to estimate the true proportion of home owners who have vegetable gardens to within 3% with 95% confid
A random sample of 70 printers discovered that 37 of them were being used in small businesses. Determine the 99 % confidence interval for the true proportion of printers that are used in small busin
The average yearly Medicare Hospital Insurance benefit per person was $4064 in a recent year. If the benefits are normally disturbed with a standard deviation of $460, find the probability that the
The average length of crocodiles in a swamp is 11.5 feet. If the lengths are normally distributed with a standard deviation of 1.7, find the probability that a crocodile is less than 11 feet long.
A manufacturer produces pistons rings for automobile engine. It is known that the ring is approximately normally distributed as well as has standard deviation of s = 0.001 mm. A random sample of 15
The closing price of Schnur Sporting Goods Inc. common stock is uniformly distributed between $24 and 37 per share.
Assume we roll a die repeatedy till we see each number a least once and let R be the number of rolls required. Determine the mean and variance of R.
Given are five (5) obersvations for two variables, x and y.
You plan to invest $200,000 in stocks on the Toronto Stock Exchange. If you invest $2000 in any specific stock, your profit will be $400, $200, $0 or -$200 (a loss) with probability 0.25 each. There
Assume that we will randomly choose a sample of four measurements from larger population of measurements. The sampling distribution of sample mean is the probability distribution of a population. In
Suppose that the average annual salary for worker in United States is $36,500 and that the annual salaries for Americans are normally distributed with a standard deviation equal to $6,500. Find the
Find the value of z such that approximately 26.42% of the distribution lies between it and the mean.