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A study was conducted to see if more than 60% of the American corporate work force felt that they were overdue for a promotion
When would I want a small confidence interval and when would I be satisfied with a larger one? When is a larger sample important?
Suppose that 55 percent of the people in a population of 500,000 support your candidate. If you conduct a poll of 1,000 people, what is the interval
Any normal distribution can be converted to a standard normal distribution by finding
Body mass index is calculated by dividing a person?s weight by the square of his or her height; it is a measure of the extent
Constructing a confidence interval - The stemplot below lists the ages of applicants who were successful in winning promotion
According to a survey conducted in October, 2001, consumers were trying to reduce their credit card debt
Listed below are weights (in grams) from a sample of bats. Construct a 95% confidence interval estimate of their mean weight
Refer to the data for 308 diamonds.Two quantitative variables in the data set are number of carats and selling price.
The confidence interval: 5.06 < sigma2 < 23.33 is for the population variance based on the following sample statistics:
When a statistic calculated from sample data is used to estimate a population parameter, it is called :
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