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A new tenant of the building intends to have a total of 125 new employees. What is the probability that the new employees will consume more than 240 cups per day?
What is the probability that a simple random sample of 40 malegraduates will provide a sample mean within $10,000 of the population mean, $168,000 (to 4 decimals)?
An independent random sample of 70 retired nurses who received their RN degrees at age thirty or later indicated that their mean length of service in the profession was 10.2 years with standard devi
Two years ago, a random sample of 1000 homeowners showed that 435 of them had flower gardens. This year an independent random sample of 1000 homeowners showed 380 of them have flower gardens. Test t
The service pulls a random sample of 50 reports in that sample, the average length of calls was 1.2 minutes with a standard deviation of 0.6 minutes. Construct a 90% confidence interval for the aver
Find an 80% confidence interval for the difference in population mean numbers of eggs per nest. Does it seem likely that there is a difference in the population means? Explain.
In a survey of office workers, each subject in a random sample of 36 is asked to report the number of times during the previous month that he or she has eaten an evening meal at a non-fast food rest
A marketing research firm is interested in knowing about the acceptance of a chocolate flavored cough medicine. In a survey of 120 people, 51 indicated that they would buy a chocolate flavored cough
The LSAT has a mean score of 151 with a standard deviation of 9 and a unimodal, symmetric distribution of scores. A test preparation organization teaches small classes of 9 students at a time. A la
A sinlge die is rolled. A person receives double the numbers of dollars corresponding to teh dots on the face that turn up ($2, $4, $6, $8, $10, $12). What is the expected amount a person could win?
In collecting data about our student population, 91 females and 53 males were surveyd. It was determined that 16% of the females sampled are left-handed and 96% of the males are right handed. If a s
Find the area under the standard normal curve over the interval z = ?0.53 to z = 0.53. Compute probabilities using the standard normal table in Appendix B (Table 3). Round the answer to four decimal
What is the purpose of using hypothesis testing? How may it be used to formulate strategies? Provide examples related to strategy formulation and implementation.
Let X denote the number of defective gauges selected and Y the number of nondefective gauges selected. a) Find the marginal densities for both X and Y. What type of random variable is Y? b) Intuitiv
Suppose a local store averages 483 cusotmers per day entering the facilty with a standard deviation of 112 customers. A random sample of 48 days was selected. What is the probability that the averag
An article suggests the uniform distribution on the interval (8.5, 18) as a model for depth (cm) of the bioturbation layer in sediment in a certain region. What is the probability that observed dept
A manufacturer of booklets packages them in boxes of 100 booklets. It is known that, on the average, the booklets weigh 1 ounce, with a standard deviation of 0.024 oz. The manufacturer is interested
A biologist wishes to estimate the effect of an antibiotic on the growth of a particular bacterium by examining the mean area of bacteria present per plate of culture when a fixed amount of the anti
Patients arriving at an outpatient clinic are routinely screened for high blood pressure. Assume that this condition occurs in 15% of the population. What is the average number of patients that must
How high can a major league player's strikeout rate go? The accepted strikeout rate in the majors is roughly 25 percent. Consider a random variable that is the number of strikeouts in 10 plate appea
Raul has designed a research study in which subjects come to his lab and practice extension of the knee to a target angle with and without vibration. He is interested in determining whether vibratio
52% of NYC adults are male. 90% NYC adults have their drivers license. If gender of adults and having a drivers licese are independent, what percentage of males do not have their drivers license?
The website Cribbage Pro has kept records of millions of games of cribbage and has estimated that the dealers crib will contain a single pair 46.7% of the time. Assume the content of each crib is in
What is the expected number of people in a household? Find the variance for the number of people per household.
Determine what is the difference between the fractions of defectives produced by two processes with a confidence level of 90%.