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A survey of small businesses with Web sites found that the average amount spent on a site was $11,500 per year (Fortune, March 5, 2001).
Ophelia O'Brien, VP of Consumer Credit of American First Banks (AFB), has implemented a 'fast feedback' to keep her informed of the default rate
An important factor in selling a residential property is the number of people who look through the home. A sample of 15 homes recently sold in the Buffalo
A certain medication is known to increase the pulse rate of its users. The standard deviation of the pulse rate is know to be 4 beats per minute.
A student surveys 100 classmates by asking each if they have outstanding loans. After finding the sample of proportion for this sample of n = 100 subjects
After examining the pattern of the above confidence intervals, complete the following statement. As the degree of confidence decreases, the confidence interval
How much does understanding the concept of confidence interval affect the way you draw conclusions from survey data or information presented in the news
For a sample mean of 4 and a population standard deviation of 0.3 with a sample size of 100, find the 95% CI for the population mean.
Compare the results of the large sample with the results from the small sample and explain what they mean.
The business college computing center wants to determine the proportion of business students who have personal computers at home.
A simple random sample of 40 items resulted in a sample mean of 25. The population standard deviation is = 5.
In a study, Germination and Emergence of Broccoli, conducted by the Department of Horticulture at Virginia Polytechnic Institute and State University
The breaking strengths of cables produced by a certain manufacturer have a standard deviation of 82 pounds. A random sample of 150 newly manufactured cables
Suppose the coach of the football team wants to estimate the proportion of the population of fans who support his current starter lineup
The heights of a random sample of 50 college students showed a mean of 174.5 cm and standard deviation of 6.9 cm.
A random sample of 40 men drank an average of 20 cups of coffee per week during finals, while a sample of 30 women drank an average of 15 cups of coffee
Consider the following results for independent samples taken from two populations.
A confidence interval is desired for the true average stray-load loss (watts) for a certain type of induction motor when the line current is held at 10 amps
In considering the production of a new car accessory, the Michigan Manufacturer Company wants to do a marketing study to determine the proportion of cars
Explain how the purpose of estimation differs from the purpose of a hypothesis test.
An upper-level sociology class at a large urban university has 120 students, including 34 seniors, 57 juniors, 22 sophomores and 7 freshmen.
A college finds that the data on an achievement test for entering freshmen is mound-shaped and has a mean score of 60 with a standard deviation of 6
From a large number of actuarial exam scores, a random sample of 375 scores is selected, and it is found that 270 of these 375 are passing scores
Our customers expect a call to be completed in 22 minutes. Using the data below, does either of our call centers meet this expectation with an alpha level
An article contained the following observations on degree of polymerization for paper specimens for which viscosity times concentration fell in a certain middle