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A recent study of 750 Internet users in Europe found that 35% of Internet users were women. What is the 95% confidence interval estimate for the true proportion of women in Europe who use the Intern
The number of students that come to your professor's office hours for help follows a Poisson distribution. What is the probability of at least one "slow day" during any given week (5 days)?
A researcher wishes to know, with 98% confidence, the percentage of women who wear shoes that are too small for their feet. A previous study conducted by the Academy of Orthopedic Surgeons found tha
A sample of 23 European countries found that the variance of life expectancy was 7.3 years. What is the 95% confidence interval estimate for the variance of life expectancy in Europe?
Find the 95% confidence interval for the standard deviation of the lengths of pipes if a sample of 26 pipes has a standard deviation of 10 inches.
Estimate the percentage who weigh more than 180 pounds? Assume that we want 96% confidence that the error is no more than 1.5 percentage points.
Using a level of significance of .10, is there evidence that the dual degree students are receiving lower grades? Fully explain your answer.
The average gas mileage of a certain model car is 26 miles per gallon. If the gas mileages are normally distributed with a standard deviation of 1.3, find the probability that a randomly selected ca
At a large department store, the average number of years of employment for a cashier is 5.7 with a standard deviation of 1.8 years. If the number of years of employment at this department store is n
One of the bus drivers is also randomly selected. Let Y denote the number of students on his bus. Compute the expectations of X and Y.
In order to be accepted into a top university, applicants must score within the top 5% on the SAT exam. Given that SAT test scores are normally distributed with a mean of 1000 and a standard deviati
The following data on annual rates of return were collected from five stocks listed on the New York Stock Exchange ("the big board") and five stocks listed on NASDAQ. Assume the population standard
The standard deviation of the sampling distribution of sample proportion is 0.025. However, the report did not indicate what the sample size n was. What was it?
Which matters most, the average time it takes to complete the task or the most frequent amount of time? How much does the time spent on the task vary? How would you go about finding the middle of th
Another special mixture, Fatso 1B, was used in another pond. The mean of the population was computed to be 126.9 grams and the standard deviation was 1.20 grams. Which food results in a more uniform
What is the probability that the sample proportion,p^ , will be within ± 3 percentage points of the true p, i.e., Pr{0.42 ≤p^ ≤ 0.48}?
With mean 158 centimeters and standard deviation 6 centimeters. Which country has the higher percentage of women taller than 167 centimeters?
A 95% confidence interval for the difference between the proportion of 20-24 year olds and the proportion of 25-29 year olds who are smokers is 0.032 < p1 - p2 < 0.128. Which of the following
At a party there are 37 students over age 21 and 22 students under age 21. You choose at random 3 of those over 21. Why is your sample not an SRS?
How many business students must be randomly selected to estimate the mean monthly earnings of business students at one college? We want 95% confidence that the sample mean is within $128 of the popu
Suppose a researcher wants to study the effectiveness of a new reading program for students who have not acquired the necessary reading skills by the time they reach the 8th grade.
A survey claims that 9 out of 10 doctors (i.e., 90%) recommend brand A for their patients who have children. To test this claim against the alternative that the actual proportion of doctors who reco
How tall would the door need to be if Boeing wanted to ensure 95% of men could fit through the door without bending?
The 47 students on a computer studies course each recorded the number of whole minutes, x, spent surfing the internet during a given day. The results are summarised below:
Write a 700- to 1,050-word paper in APA format explaining your research methods and process for limiting the uncertainty within the decision. Discuss your results in an in-depth narrative.