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A survey of adults ages 18-29 found that 82% use the internet. You randomly select 196 adults ages 18-29 and ask them if they use the internet.
An electronic switching device occasionally malfunctions and may need to be replaced. The device is considered Satisfactory ifit makes on average no more than 0.2 errors per hour. A particular 5 hou
A survey of adults ages 18-29 found that 82% use the internet.You randomly select 196 adults ages 18-29 and ask them if they use the internet.
Given the significance level 0.05, the F-value for the degrees of freedom, df = (3,7) is A. 6.16. B. 4.12. C. 4.35. D. 8.89
A student has five motor vehicle accidents in one year and claims that having five accidents is not unusual. Use the frequency distribution below to determine if the student is correct.
A regional survey of 560 companies asked the vice president of operations how satisfied he or she was with the software support received from the computer staff of the company.
Because of nonresponse, the fraction of women among recipients of the survey could be anything between (low) __________ and (high) _________.
The random variable x represents the number of cars per household in a town of 1000 households. Find the probability of randomly selecting a household that has between one and three cars, inclusive
What is the probability of randomly selecting 1 woman with a height less than 64.9 inches? What is the probability of selecting a sample of 22 woman with a mean height less then 64.9 inches?
Let x be the number of trials required to obtain a success where p is the probability of success on each trial. The hypothesis Ho: p=.1 is to be tested against the alternative Ha: p=.3. The hypothes
An advertisement for a popular weight loss clinic suggests that participants in its new diet program lose, on average, more than 10 pounds. A consumer activist decides to test the authenticity of th
The random variable x represents the number of cars per household in a town of 1000 households. Find the probability of randomly selecting a household that has at least one car.
To test the efficacy of a health education program in reducing the risk of food-borne and water-borne diseases, two Peruvian villages were given an intensive health education program.
A recent study by allstate insurance co finds that 82% of teenagers have used cell phones while driving. State the null and the alternative hypotheses to test the polivy analysts objective
Discuss the concept of expected frequencies and summarize the steps involved in computing them.
You are investigating the role of physical activity in heart disease and suggest that physical activity protects against having a heart attack. While presenting these data to your colleagues, someon
Television viewing = 8.35 hours per day per household. Normal probabiity distirbution with a standard deviation of 2.5 hours
The weight of football players is normally distributed with a mean of 200 pounds and a standard deviation of 25 pounds.
The population mean and standard deviation are given below. Find the required propability and determine wheather the given sample mean would be considered unusual.
Determine a 95% confidence estimate for the mean time between failures (MTBF) of a power supply. We have 200,000 hours equipment hours of data and two failures occured during that time. Assume the t
Compute the hazard rate function of X when X is uniformly distributed over ( 0, a).
Assume that the actual surgery duration of this operation suit has a sample mean as x(bar)= 70 minutes and standard deviation as s=15 minutes. The sample size is n=248. Construct a point estimation
The probability of getting a defective widget is .10. You select five widgets for the National Widget Championship.
You want to give a bonus to the top 5% of your sales people and extra special attention to the bottom 25%. Average sales are $50,000 with a standard deviation of $10,000.
The average flight from point A to point B takes 50 minutes with a standard deviation of 5 minutes. What is the probability a random sample of 4 flights will take between 43 and 48 minutes?