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Assuming this to be a simple random sample of U.S. adults, construct and interpret the 95% and 99% confidence intervals for the proportion of U.S. adults who consider lounging at the beach to be the
The average age of Amtrak passenger train cars is 19.4 years. If the distribution of ages is normal and 24% of the cars are olderthan 21.1 years, find the standard deviation.
A homogenous transition probability matrix is given below. Find the steady state probabilities of state.
For the following, decide whether the Binomial or Hypergeometric distribution is the most appropriate model. Give a brief description of your reasoning.
A toll bridge charges $1.00 for passenger cars and $2.50 for other vehicles. Suppose that during daytime hours, 60% of all vehicles are passenger cars. If 1000 vehicles cross the bridge that afterno
A company has 1,250 employees, and you want to take a simple random sample of n = 60 employees. Explain how you would go about selecting this sample by using the table of random numbers. Are there n
The average flight from point A to point B takes 100 minutes with a standard deviation of 10 minutes.
Members of the Senate took a battery of tests to assess their abilities. In the Talking As If You Are Saying Something Test, the average score was 40 with a standard deviation of 5.
Let X have an exponential distribution with mean sigma.
The quality-control inspector of a production plant will reject a batch of syringes if two or more defective syringes are found in a random sample of eight syringes taken from the batch. Suppose th
According to data from the Environmental Protection Agency, the average daily water consumption for a household of four people in the United States is approximately at least 243 gallons. Suppose a s
A factory produces fuses, which are packaged in boxes of 25. Eight fuses are selected at random from each box for inspection. The box is rejected if at least one of these eight fuses is defective. W
For a normal distribution, find the z-score that cuts off the bottom 63.66% of all the z-scores. Round to 2 decimal places after the decimal point.
On average, a textbook author makes two word processing errors per page on the first draft of her textbook. What is the probability that on the next page she will make
A large chain retailer purchases a certain kind of electronic device from a manufacturer. The manufacturer indicates that the defective rate of the device is 3%.
Describe the characteristics of the F distribution. Provide examples. What are we testing when we test for two population variances? Explain your answer and provide an example.
The average time waster per week for 10 weeks was 4.1 hours with a standard deviation of 1.33 hours. If a hypothesis test was performed at the .01 level with an assumption of a normally distributed
Eleven patients were weighed before and after a diet which was designed to help patients reduce weight. Eight of these patients did lose weight but three patients had a weight increase.
Eight of these patients did lose weight but three patients had a weight increase.To test whether the diet is successful (i.e., post weight is lower than pre-weight) using post weight-pre-weight, sta
The prevalence of a health condition is the existing number of cases of that condition in the population. State whether the factors listed below are likely to increase or decrease the prevalence of
Calculate the appropriate disease frequency rate. Show your work. The cumulative incidence rate in a population of 100,000 people where 9 new cases of disease were reported within 1 year.
Assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation of 15. Find the probability that a randomly selected adult has an IQ less than 124.
The lifetime of one of DotCom's electronic equipment has a mean of 400 hours and standard deviation of 400 hours. They have been assuming lifetime is normally distributed. What is the probability th
Suppose certain coins have weights that are normally distributed with a mean od 5.492 g and a standard deviation of 0.062 g. A vending machine is configured to accept those coins with weights betwe
Your client is considering two investments and has asked you to evaluate these alternatives. Provide financial and risk advice for your client regarding which to purchase.