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The tread-life of snow tires can be described by a normal model with a mean of 36,000 miles and a standard deviation of 2500 miles.
1. Could we expect our tire to last 42,000 miles? Explain using statistical reasoning and show all calculations, should include z-score and the probability.
2. Approximately ___________________ of tires will last between 30,000 miles and 40,000 miles. (to the nearest tenth of a percent)
3. The snow tire company wants to advertise 10% of their snow tires last longer than 45,000 miles. If the standard deviation remains at 2500 miles, what must the mean life-span of the tread be improved to? Show work.
A random sample of 95 printers discovered that 20 of them were being used in small businesses. Find the 95% limit for the population proportion of printers that are used in small businesses.
What is an interaction? Describe an example and identify the variables within your population (work, social, academic, etc.) for which you might expect interactions?
Metro Real Estate Association is preparing a pamphlet that they feel might be of interest to prospective homebuyers in the Middletown and Brockton areas of the city.
Give an estimate of the change in expected peak voltage with a 1% increase in light absorption. Estimate the expected value of peak voltage when % light absorption is 20.
A quarterback on a football team has a pass completion rate of 0.62. If, in a given game, he attempts 16 passes, what is the probability that he will complete
The proportion of adults in the sample, as her estimate of p, the proportion of adults in the pond population. Find using the normal approximation with the continuity correction.
Suppose a consumer product researcher wanted to find out whether a highlighter lasted less than the manufacturer's claim that their highlighters could write continuously for 14 hours. The researcher tested 40 highlighters and recorded the number o..
Upon reviewing the accounting records from the restaurant, you discover that it grosses roughly $3000 per day on 6 out of 10 days. Determine the estimated probability that the restaurant will gross over $3000:
They plan to set up a radar trap and check the speeds of 80 randomly selected cars. Can this distribution be approximated by a normal curve?
suppose x is uniform of 0 pi2 and ysinx. find the density function of y. the answer is called the arcsine law because
The listeners do not know which is playing, and the order has been determined randomly. Each person is asked to state which of the two performances he or she prefers. What statistical test is most appropriate here? Why?
What is the shortest time period in which the project can be completed using the expected times listed in the table above. What is the shortest time in which the project can be completed if extra money is used to reduce the times for certain activi..
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