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A report states that 44% of home owners have a vegetable garden. How large a sample is needed to estimate the true proportion of home owners who have vegetable gardens to within 5 percentage points
What is the probability that a randomly selected household purchased a DVR, given that the household purchased a plasma-screen television?
Many people think that a national lobby's successful fight against gun control legislation is reflecting the will of a minority of Americans. A previous random sample of 4000 citizens yielded 2250 w
the associated press reported that 71% of americans ages 25 and older are overweight. assume this is true. a random sample of 12 adults 25 or older is selected from general population. what is
Without performing any calculations, will the interval increase, decrease or stay the same? Which of the values in the formula will change?
The daily rainfall experienced by Soaking City has been recorded on 9 randomly selected days throughout the year. This process has been repeated for every possible combination of 9 days in a year.
If no more than 5% of the containers are to weigh less than 15.8 oz., what must the standard deviation of the weights equal?
An airline estimates that 95% of people booked on their flights actually show up. If the airline books 65 people on a flight for which the maximum number is 63, what is the probability that the num
Assume each shot is independent of the others. If she shoots 6 arrows, what's the probability of each result described below. Her first bull's-eye comes on the third arrow.
The weight of a product is normally distributed with a standard deviation of .5 ounces. What should the average weight be if the production manager wants no more than 6% of the products to weigh mor
Transportation officials tell us that 60% of drivers wear seat belts while driving. What is the probability that between 509 and 521 drivers in a sample of 900 drivers wear seat belts?
Your probability of winning any individual game against Joe Blow is p1, and of winning against the champion is p2 (p1 > p2). Assume all games are independent. Which opponent sequence would you ch
Suppose we have a population of scores with a mean (μ) of 200 and a standard deviation (σ) of 10. What score would cut off the top 5 percent of scores?
Suppose we have a population of scores with a mean (μ) of 975 and a standard deviation (σ) of 15. What percentage of the population will lie below 975?
The annual premium of a special kind of insurance starts at $1000 and is reduced by 10% after each year where no claim has been filed. The probability that a claim is filed in a given year is 0.05,
How is a sampling distribution of the mean similar to and different from a distribution of raw scores? What is the standard deviation of a sampling distribution of the mean called? How is it affecte
Suppose that on average 1 person in 100 makes a numerical error in preparing his or her income tax return .if 10000 forms are selected at random and examined . find the probability that 6,7,8,of th
Twenty-eight items are randomly selected from a population of 260 items. The sample mean is 38 and the sample standard deviation 5. Develop a 90 percent confidence interval for the population mean.
Complete the table by calculating the mean square, F, significance of F, and Omega2 values.
Harrington Health Food stocks 5 loaves of Neutro-Bread. The probability distribution for the sales of Neutro-Bread is listed in the following table. How many loaves will Harrington sell on average?
Use the steps of hypothesis testing, (b) sketch the distributions involved, and (c) explain your answers to someone who has never had a course in statistics.
The students were asked to evaluate the effectiveness of the format on an 11-point scale (1 = poor, 11 = excellent). What are the degrees of freedom associated with the test statistic?
In a study of the stability of IQ scores, a large group of individuals is tested once at age 18 and again at age 35. predict the score at age 35 for an individual who scored 115 at age 18.
A researcher is interested in estimating the average salary of police officers in a large city. She wants to be 95% confident that her estimate is correct. If the standard deviation is $1050, how la
use the margin of error , confidence level and standard deviation to find the minimum sample size required to estimate an unknown population mean. The margin of error is $125, confidence level is 9