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Express Courier Service has found that the delivery time for packages is normally distributed, with mean 14 hours and standard deviation 2 hours.
Assume that a procedure yields a binomial distribution with a trial repeated n times. Use the binomial probabilities table to find the probability of x successes given the probability p of suces on
A pharmaceutical Company receives large shipments of aspirin tablets. The acceptance sampling plan is to randomly select and test 15 tablets, then accept the whole batch if there is only one or none
Assume that a procedure yields a binomial distribution with a trial repeated ntimes. Use a binomial probabilities table to find the probability of x successes given the probabability p of sucess on
Box A contains four white marbles and seven black marbles. Box B contains five white marbles and six black marbles. An experiment consists of first selecting a marble at random from Box A.
The Rayleigh probability density function is the special case of the Weibull probability density function, when %u03B1, the Weibull shape parameter, is 2. That is, a Rayleigh random variable, X has
A survey of a simple random sample of university alumni finds that six months after graduation, 75 of the 100 liberal arts majors and 45 of the 50 business administration majors had found employment
Suppose Y is the daily revenue for some company, where E(Y) = $10,000 and Var(Y) = $^2 540,000 and ?y = $734.85.
A survey of a simple random sample of recent university graduates finds that six months after graduation, 75% of the 400 students surveyed had found employment within their field of study. Is this s
According to an airline, a particular flight is on time 95% of the time. Suppose 10 flights are randomly selected and the number of on time flights is recorded.
A scientist is proposing a study on the level of violence in teenagers. He feels that the boys are more violent than females. Violence tests were conducted with 50 randomly selected boys and females
Construct a 99% confidence interval for the population proportion of brown eye people in the United States.
Data from a national survey of college students living away from home indicate that freshman go home an average of 1.7 times per month. A simple random sample of 121 UMD students living away from ho
A researcher wants to know if the amount of calories in a meal from five different restaurants is different. What type of statistic should be used?
Describe an alternative to counterbalancing as a means of controlling confounding variables. Give an example to back up your answer.
Why is the repeated measures ANOVA usually a more sensitive test of the relationship between the independent and dependent variables than is a between-subjects ANOVA?
Salt-free diets are often prescribed to people with high blood pressure. The following data values were obtained from an experiment designed to estimate the reduction in diastolic blood pressure as
Surveys have become an important component of American life. They directly affect us in so many ways, including public, policy, the television shows we watch, the products we buy, and the political
Suppose three fair dice are rolled at the same time. a) What is the probability that at least one number will be less than 5?
Which of the following best describes the sample: Confidence, simple random sample, random sample, voluntary response, stratified sample, or cluster sample.
Major league baseball salaries averaged $3.26 million with a standard deviation of $1.2 million in 2013. Suppose a sample of 100 major league players was taken. Find the approximate probability tha
In a study of the effectiveness of garlic for lowering cholesterol, 17 subjects were treated with Garlicin, which is garlic in a processed tablet form. The measurement of interest is the change in L
There is a 0.0724 probbability that a best-of-seven contest will last four games, a 0.2115 probability that it will last five games, a 0.2747 probabilty that it will last six games, and a 0.4414 pro
If a person bought one share of Google stock within the last year, what is the probability that the stock on that day closed within $45 of the mean for that year? Hint: Find two z scores and use the
The population (in millions) and the violent crime rate (per 1000) were recorded for 10 metropolitan areas. The data are shown in the following table. Do these data provide evidence to reject the nu