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Newton's, a tire manufacturer, wanted to set a mileage guarantee on its new Road Warrior 60 tire. A sample test of 500 tires revealed that the tire's mileage is normally distributed with a mean of 50,000 miles and a standard deviation of 1,750 miles. The warranty on the tires is presently set at 47,500 miles. The z-test statistic result was 1.43. The manufacturer wanted to determine if the tires were exceeding the guarantee. At the .05 significant level, it was concluded that the tires are exceeding the manufacturer's guarantee.
The caffeine content of 20 brands of regular coffee is shown below. 80 82 89 85 87 30 33 44 40 46 50 55 60 62 71 90 92 75 63 65. Thus, this job helps to construct a Frequency Distribution with a class interval of 10, starting with 30.
Your company ships a lot of packages needing quick delivery and short notice. In the past, you have used Speedy Air Delivery Service, but you are beginning to receive complaints from customers who say they are not receiving their packages on time.
A sustained long-term change in the level of the variable that is being forecasted per unit of time is: (A trend, A time series, Seasonality or A change due to business cycles)
The J.O. Supplies Company buys calculators from a Korean supplier. The probability of a defective calculator is 10%. What is the probability that 4 or more of the calculators will be defective?
Find the probability that the carbon monoxide concentration exceeds 9 ppm during a randomly selected one-hour period.
The x and the y variable in the table below are correlated. Determine the 'R' value, and then determine the regression equation.
A compute manufacturer is about to unveil a new,faster PC.The new PC is faster but intial tests incidcate there is more variation in the processing time.
Write down the objective coefficient ranges for three components? Interpret these ranges for company management.
Can we conclude that the mean time for a game is less than 3.50 hours? Use the .05 significance level.
What are three lessons learned relative ANOVA and Nonparametric tests? What concepts and analytic tools will you be able to use in your workplace ?
Suppose the following statistics were calculated from data gathered from a randomized block experiment with k = 4 and b = 10:
The general social survey is an annual survey given to about 1,500 U.S. adults selected at random. Each year, the survey contains several questions meant to probe the respondents' views of employment.
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