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Assume the population standard deviation is 3.8 thousand dollars.
If you were constructing a 99% confidence interval of the population mean based on a sample of n = 25 where the standard deviation of the sample s = 0.05
A sample of 81 observations is taken from a normal population. The sample mean is 40, and the sample standard deviation of 5.
Calculate a point estimate and a 95% confidence interval of the mean. Assuming your data set is normally distributed, determine an appropriate sample size
The following table classifies 800 telephone calls by type (local or long distance) and by length:
A building developer has the opportunity to purchase several acres of land that is divided up into several lots for building single-family homes.
State the main points of the Central Limit Theorem for a mean.
A study by the National Park Service revealed that 50 percent of vacationers going to the Rocky Mountain region visit Yellowstone Park
For a random sample of 10 fifth generation iPod music players, the mean battery life was 9.47 hours with a standard deviation of 2.14 hours.
A survey conducted during May 20 - 22, 2005, asked 1006 Americans, "During the past year, about how many book, either hardcover or paperback
The following sample of 16 measurements was selected from a population that is approximately normally distributed:
The diameter of Ping- Pong balls manufactured at a large factory is expected to be approximately normally distributed with a mean of 1.30 inches
Can you give a general rule as to what happens with confidence intervals as a function of sample sizes and confidence levels? What are the trade-offs?
The P-value for a two sided test of the null hypothesis H0: µ = 30 is 0.04.
A random sample of 10 miniature Tootsie Rolls was taken from a bag. Each piece was weighed on a very accurate scale.
A quality engineer is responsible for maintaining control of the bottling process in a beer factory. The goals is to maintain the intended volume (6 oz)
What do we mean by confidence intervals - provide an example that illustrates your answer.
In most cities a municipal agency regulates the amounts charged by taxis. Total taxi fares are determined by distance traveled as well as the amount of time
For df = 25, determine the value of A that corresponds to each of the following probabilities:
An assembly process inlcudes a torque wrench device that automatically tightens compressor housing bolts; the device has a known process standard deviation
The mean number of travel days per year for the outside salespeople employed by hardware distributors is to be estimated
In a nutshell, the idea is to show that you understand confidence intervals and hypothesis testing and can interpret your results carefully
Salaries: Student services consider college officials in admissions, registration, counseling, financial aid, campus ministry, food service, and so on
Collect data. Develop a 90% confidence interval and a 95% confidence interval for the population mean. Did you use a z statistic or t statistic
A new product was test marketed in the Des Moines, Iowa, and Toledo, Ohio, metropolitan areas.