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A university found that 30% of its students withdraw without completing the introductory statistics course. Assume that 20 students registered for the course.
Assume that customers arrive completely randomly, one at a time, at the rate of 15 per hour. Calculate the operating characteristics of interest to the manager.
When the manager is helping, the mean service time for each of the two servers is reduced to 1.5 min. The shop cannot legally hold more than 20 customers. Use the general birth-death process to det
Assume X is a standard normal random variable and Y ~ N(0,9)(so variance is 9). What is the 97.5 percentile of p(X) and p(Y)?
The shop cannot legally hold more than 20 customers. Use the general birth-death process to determine: A) the expected number of customers in the shop
Consider a binomial random variable where the number of trials is 9 and the probability of success on each trial is 0.43. Find the mean and standard deviation of this random variable.
What happens to the required sample size if the confidence level is decreased from 95% to 90% and the same error margin is allowed in each case?
How would you set up the null and alternative hypothesis for a company hoping to support claims that its product (juice, supplement, etc.) could effectively lower cholesterol?
Find the value of the linear correlation coefficient r. X = 22.6, 36.6, 15.6, 35.0, 47.5
Suppose A, B and C are independent events, with probabilities, P(A), P(B) and P(C). What are the probabilities that at least two of the three events occur, using set notation?
The 10 year survival rate for bladder cancer is approximately 50%. If 20 people who have bladder cancer are properly treated for the disease,what is the probability that:
Use the rule of 70 to find the approximate doubling time for a population whose annual growth rate is 0.7% (U.S.)? and 1.2% (World)?
Sixty-four (64) patients indicated that they were dissatisfied with the after surgery care. What are the mean and the standard deviation of the sampling distribution of p?
To get the best deal on a CD player, Tom called eight appliance stores and asked the cost of a specific model. Find the Standard deviation.
If we have a sample size of 100 and the estimate of the population proportion is 0.10, the mean of the sampling distribution of the sample proportion is:
If a random sample of 30 lobster fishermen is selected, what is the probability that their average catch is less than 31.5 pounds?
If the box weights have a population mean and standard deviation of 90 lbs. and 24 lbs. respectively, then based on a sample size of 36 boxes, the probability that the average weight of the boxes wi
A survey of 85 families showed that 36 owned at least one DVD player. Find the 99% confidence interval estimate of the true proportion of families who own at least on DVD player.
When the level of confidence and sample size remain the same, a confidence interval for a population proportion p will be __________ when p(1-p) is larger than when p(1-p) is smaller.
Using the relative frequency approach, what is the probability that a particular death is due to an automobile accident?
What is the 95% confidence interval for the proportion of all delinquent customer accounts at this manufacturing company?
What is the probability that none of three randomly selected persons is allergic to this drug? Assume that all three persons are independent.
A company is interested in estimating the mean number of days of sick leave taken by its employees.
What is the probability that the average length of a sheet is between 30.23 and 30.32 inches long?
This means that spending a longer amount of time in prison causes people to become more aggressive. Please explain your response.