Fin 370 Fin 370 Final ( Latest )

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1. A mechanic sells a brand of automobile tire that has a life expectancy that is normally distributed, with a mean life of 35,000 miles and a standard deviation of 2800 miles. He wants to give a guarantee for free replacement of tires that don’t wear well. How should he word his guarantee if he is willing to replace approximately 10% of the tires?

1. 2 Find the indicated z-score shown in the graph to the right.

1. A researcher wishes to estimate, with 95% confidence, the amount of adults who have high-speed internet access. Her estimate must be accurate within 4% of the true proportion.

a) find the minimum sample size needed, using a prior study that found that 32% of the respondents said they have high-speed internet access.

b) no preliminary estimate is available. Find the minimum sample size needed.

The total cholesterol levels of a sample of men aged 35-44 are normally distributed with a mean of 221 milligrams per deciliter and a standard deviation of 37.7 milligrams per deciliter.

(a) what percent of men have a total cholesterol level less than 228 milligrams per deciliter of blood?

(b) if 251 men in the 35-44 age group are randomly selected, about how many would you expect to have a total cholesterol level greater than 264 milligrams per deciliter of blood?

A doctor wants to estimate the HDL cholesterol of all 20-29 year old females. How many subjects are needed to estimate the HDL cholesterol within 2 points with 99% confidence assuming σ = 18.1? suppose the doctor would be content with 90% confidence. How does the decrease in confidence affect the sample size required?

Use a table of cumulative areas under the normal curve to find the z-score that corresponds to the given cumulative area. If...