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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 Issue 1 on the ballot. Construct a 95% confidence interval for the proportion that favor the issue and then discuss what the reporter can and cannot say in his report. If you were the editor of a newspaper reporting on the results, what questions would you have of the reporter before you printed his story?
Sample data recently collected indicate that Dough Boy's crusts average 30 centimeter in diameter, with a standard deviation of 1.1 centimeters.
Identify each variable in the formula for the binomial probability density function. Also, explain what the fraction: n! / (n-x)!x! calculates.
Lauren Moore has sold her business for $500,000 and wants to invest in condominium units ( which she intends to rent) and land ( which she will lease to a farmer).
Suppose you toss a die 100 times in a row. What is the probability that you see 4 spots between 10 and 20 times?
What is the point estimate of the difference between the population mean expenditure for males and the population means expenditure for females?
In order to test the assumption of a Poisson distribution, a random sample of 150 ten-minute intervals was taken.
If W denotes the total number of spaces one moves under these special conditions, find the mean and standard deviation of W.
A random sample of 160 car crashes are selected and categorized by age. The are listed below. The age distribution of for the given categories is 18% for under 26, 39% for 26-45, 31% for 46-65, and 12% for over 65.
In the early years of the twenty-first century, annual salaries for federal employees in the Upper Midwest averaged approximately $42,000, with a population standard deviation (σ) of $4,900. If we drew a random sample of 25 federal employees from ..
The sample mean of the accounts is found to be y-bar = $94.22, and the sample variance is equal to $455.21. Estimate mu and place a bound on the error of estimation.
Describe the purpose of transforming raw scores into standard scores. Describe what "normal distribution" means.
Suppose that 15% of all adults jog. An opinion poll asks a simple random sample of 500 adults if they jog. What is the sampling proportion in the sample who jog?
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