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Question: The manufacturer of a steel-belted radial tire claims that the mean mileage the tire can be driven before the tread wears out is 80,000 kilometres. The standard deviation of tread life is 8,000 km. A truck company purchased 49 of these tires and found a mean tread life of only 79,200. On the basis of this data, test the null hypothesis that the mean tread life is at least 80,000 km. against the alternative that the mean life is less than 80,000 km. Use a 5% level of significance.
A standard deviation of about $9000. Approximately what percentage of household incomes in this state is between $27,000 to $63,000/year? Show all work as to how this is obtained.
A recent national survey found that high school students watched an average (mean) of 7.5 DVDs per month with a population standard deviation of .60.
On average, 8% of the subscribers respond to the survey. Of the 8% who respond, an average of 53% say they will renew. What is the Population and the Sample to this problem.
Public transportation and the automobile are two methods an employee can use to get to work each day. Samples of times recorded for each method are shown. Times are in minutes.
What is the probability that during 5 minutes interval no one will enter the store? b) what time interval is such that the probability is 0.5 that no one will enter the store during that interval?
This morning the office you are monitoring has eight office visits on the schedule. What is the probability that
Peter, Paul, Mary, John and Martha are members of the pastoral council at a localchurch. They are to be seated at one side of a long conference table in a pastoral councilmeeting.
A random sample of 20 patients in a weight loss clinical trial lost an average of 25 pounds over an 8 week period. The sample standard deviation is 10.
What is the probability of getting a sample mean larger than $135 per hour?
A study of 200 commercial firms revealed the data below. What is the probability that a particular firm will have 1 million or more in income after taxes?
assume that a set of test scores is normally distributed with a mean of 78 and a standard diviation of 10. what
Develop a linear regression equation for these data and forecast how much money Robert will win if he spends $30.
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