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A manufacturer claims that the life span of its tires is 48,000 miles. You work for a consumer protection agency and you are testing these tires. Assume the life spans of the tires are normally distributed. You select 100 tires at random and test them. The mean life span is 47,860 miles. Assume σ=800.
(a) Assuming the manufacturer's claim is correct, what is the probability that the mean of the sample is 47,860 miles or less?
A recent national study showed that approximately 30% of college students binge-drink. Let x equal the number of students in a random sample size of n=12 who binge drink. Find the probability that
An office building in New York uses thousands of fluorescent light bulb each year. The brand of bulb it currently uses has a mean life of 900 hours
This section about DRB(Data Requirement Brief). The variable of these data collected is turnover of two sectors: Sector 52: Retail Trade and Sector 11: Extraction of Crude Petroleum. Those companies are random choose as the sample of group of reta..
find the 98 confidence interval for the difference between two means based on this information about two samples.
some plastic rods are automatically cut into lengths of 6 in. actual lengths are normally distributed about a mean of 6
Based on a random sample of 2,500 people, the estimates of people by age group unemployed in one Northern city are found in the table. Is the study descriptive or inferential?
a national grocers magazine reports the typical shopper spends six minutes in line waiting to check out. a sample of 16
what do your answers in parts a, c, d, and e imply about diversification?
Given that SAT test scores are normally distributed with a mean of 1000 and a standard deviation of 200, what is the lowest possible score a student needs to qualify for acceptance into the university?
data were collected on annual personal time in hour taken by a random sample of 16 women group 1 and 7 men group 2
Create network for aerospace launch project below and determine its critical path.
What reason would you give for supposing that the distribution is approximately normally distributed for large n?
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