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A sample of 58 night school students' is obtained in order to estimate the mean age of night school students. X bar = 24.1 years. The population variance is 24.
The image of the public library is constantly changing, and their online services continue to grow. Usage of the library's home page grew by 17% during the past 12 months. It has been estimated that
At a classic car auction, you are interested in a 1940 Ford Standard Tudor and decide to bid for the car. There is a $25,000 reserve for this car, which means highest bid in excess of $25,000 will w
In a random sample of 200 people 60 were found to participate. A two-sided 95% confidence interval for the true proportion of employees who participate is:
Although studies continue to show smoking leads to significant health problems, 20% of adults in the United States smoke. Consider a group of 250 adults. What is the expected number of adults who sm
Security screening lines at Hartsfield-Jackson Atlanta International airport are often long. The average time a passenger spends in these lines during the peak time is about 15 minutes, and follows
A random sample of 100 preschool children revealed that only 60 had been vaccinated. Provide an approximate two-sided 95% confidence interval for the proportion vaccinated.
Given that Z is a standard normal variable, P(Z > -1.61) is? If X has a normal distribution with mean 100 and standard deviation 50, P(X > 150 ) is?
On average one customer arrives every 12 seconds at an information kiosk. Arrival times follow a Poisson distribution. What is the probability that less than 5 customers arrive within the next minut
Cars arrive at a toll booth at Eppley Airfield in Omaha at an average rate of 8 in 20 minutes. Arrivals are Poisson distributed. Compute probability that 15 cars will arrive in the next hour.
Cynthia has ordered 3 identical computers for the office. The probability this make and model of computer crashes before it is 2 years old is 0.08 and independent of each other. What is the probabil
Construct a two-sided 90% confidence interval for the proportion of patients who might experience headache resolution with the experimental medication.
Lara wang is planning a driving tour. while she is interested in seeing the twelve national monuments listed here she will have to settle for seeing just three of them.
A random sample of 900 individuals has been selected from a large population. It was found that 180 are regular users of vitamins. Thus, the proportion of the regular users of vitamins in the popula
The researchers found that of 472 mechanically ventilated patients, 63 had evidence of ventilator-assisted pneumonia. Construct a two-sided 95% confidence interval for the proportion of all mechanic
Suppose that a person who has recently helped start a band for the first time is randonly selected. The probability that the band will break up within 7 months is 0.5.
Determine the test statistic. Determine the P-value for this test. Is there sufficient evidence to justify the rejection of H0 at the significant level of 0.01?
In 2003-2011 there are on average 75 days of rain per year. Assume that a year has 365 days, ignore leap years, and that a rainy day occurs randomly and is independent. What is the probability of ha
A researcher wanted to determine if the average waiting time at the emergency room in a local hospital is greater than 60 minutes. He randomly selected 15 patients at the emergency room facility and
In a large LB department store the average waiting time at the toys checkout counter is 5 minutes with a standard deviation of 2 minutes. Assume that the distribution of waiting time is normal.
The manufacturing of a layered material requires three steps which each require a certain amount of time. These steps can be assumed to be independent and the time for completion normally distribute
A recent survey compared the monthly incomes of electrical engineers with that of civil engineers. A sample of 13 electrical engineers had an average income of 64K with a sample standard deviation o
Which is typically larger, P(AxB) or P(A) x P(B)? Give an example of sets A and B for which these are the same size.
From a large class, a sample of 4 grades were drawn: 64, 66, 78, and 87. from a second large class, an independent sample of 3 grades were drawn: 59, 78, and 93. test if the two class have equivalen