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A tire company made a sampling distribution on one of its brands of tires and determined that the tire had a mean life of 56,000 miles with a standard deviation of 18,100 miles.
a. What is the probability that the life of a single tire will be less than 50,000 miles?
b. What is the probability that the mean life of a sample of 100 tires will be less than 50,000 miles?
c. The company also wants to give a reasonable warranty on this tire, yet protect itself so that the company won't have to replace more than 9% of the tires.
What guaranteed lifetime (in miles) should the company state in its advertisements for the tire
When computing a t-test, it is important to distinguish between directional and nondirectional hypotheses as the direction will determine the rejection regions. Describe how the rejection regions would differ according to the type of hypothesis yo..
A manufacturing process makes items whose weights are normally distributed. It is known that 22.57% of all the items made weigh between 100 grams up to mean and 49.18% weigh from the mean up to 190 grams. Find out the standard deviation.
Using the .10 level of significance, can we conclude that the assembly time using the new method is faster?
Can we conclude that the mean age of the population from which the sample may be presumed to have been drawn is less than 60 years? Let α = .05
A major benefit of two-way ANOVA over several one-way ANOVAs, If an F test for interaction is significant.
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A certain type of injury has tangible costs of $40,000 per occurrence and intangible costs of $150,000 per occurrence. Perform a cost/benefit analysis to weigh the benefits of the proposed safety glasses policy against its expected costs.
Fawns Fawns among1 or 5 months old in Mesa Verde National Park have a body weight that is approximately normally distributed with mean
At the .05 level of significance, is there evidence of a difference in variability in the shipping time between the two outlets? What decision should the carpet manufacturer make?
Test the overall significance of the regression model at α = .05 level. Please use the six-step hypothesis-testing framework we employed in class, and write out the last three steps in this table:
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