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A reporter took a simple random sample of 725 voters in a region that has a population of 12,457. He recorded that 338 of the persons polled favored
An election poll reported that a candidate had an approval rating of 45% with a margin of error E of 4%. Construct a confidence interval for the proportion
In the business research scenario, the population is identified as 150 employees. How many employees would need to respond to the survey
The Abalone Fancy Fish Company sells exotic fish to high end restaurants throughout the West Coast.
You are a quality analyst with John and Sons Company. Your company manufactures fax machines, copiers, and printers that use plain paper
A sample of 75 golfers showed that their average score on a particular golf course was 91.32 with a standard deviation of 6.85
Suppose the U.S. President wants an estimate of the proportion of the population who support his current policy toward revisions in the Social Security system.
A stationery store wants to estimate the mean retail value of greeting cards purchased by its customers when they visit the store.
A survey of individuals who passed the BAR finds the average starting salary for lawyers to be $75,215 for 36 individuals sampled
Is there any difference between the proportion of Americans who wish they were rich and the proportion of Canadians who wish they were rich?
A researcher is comparing the reaction times of a 10-year-olds who play video games and 10-year-olds who do not.
A random sample of students who took the SAT college entrance exam twice found that 427 of the respondants had paid for coaching courses
Let m denote the average amount of money a household in County X spent on automobile insurance in 2009. You want to use a simple random sample
The breaking strength of a random sample of n = 20 bundles of wood fibers has a sample mean x-bar = 436.5 and sample standard deviation s = 11.90.
"Durable Press" cotton fabrics are treated to improve their recovery from wrinkles after washing. Unfortunately, the treatment also reduces the strength
Given: X ¯ = 97, sx = 16, nx = 64, Y ¯ = 90, sY = 18, nY = 81; assume the samples are independent. Construct a confidence interval of µX - µY
Business Week surveyed MBA alumni 10 years after graduation (Business Week, September 22, 2003)
Can demographic information be helpful in predicting sales at sporting goods stores? The data at left are monthly sales totals from a random sample
The average time it takes to complete a test is first-year statistics is 46.2 minutes. the standard deviation is 8 minutes
Hallux abducto valgus (HAV) (deformation of the big toe that often requires surgery). Doctors used x-rays to measure the angle (in degrees)
How well a material conducts heat matters when designating houses, for example. Conductivity is measured in terms of watts of heat power transmitted
Our decisions depend on how the options are presented to us. Here's an experiment that illustrates this phenomenon.
A Company surveys 32 randomly selected employees and ask the number spent working at home after hours during a week. The results as shown below:
A study was carried out by JT Co. Regarding the stopping distance of a 1300 kilogram car under perfect weather conditions at various driving speeds
In a recent survey, 161 of 493 employees responded that they typically took work with them on vacation and 95 responded that there are unwritten