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Use the Poisson distribution to determine the probability of no arrivals in two weeks. Use the exponential distribution to determine the probability of no arrivals in two weeks.
There are 1000 students in the senior class at a certain high school. The high school offers two Advanced Placement math / stat classes to seniors only: AP Calculus and AP Statistics. The roster of
There are 150 books in a professor's office. You take a random sample of 8 of these books and count the number of pages in them. The data follow: 192 345 97 224 219 304 147 284. Construct a 90% conf
Test the mean difference for siginificance using the .05 level. List the assumptions made in computing your answer.
A web based software company is interested in estimating the proportion of individuals who use the Firefox browser. In a sample of 200 of individuals, 23 users stated that they used Firefox.
Todd Holland from New York grows pumpkins. He studied his past records carefully and concluded that the weights of his biggest pumpkins are distributed according to a normal distribution with a mean
A researcher conducted a study that examined the proportion of high school students who cheated on tests at least twice during the past year. Included in that study were the results for both 2002 an
In a survey of 1430 undergraduate students, 1087 reported that they had one or more credit cards. Provide a 90% confidence interval for the proportion of all college students who have at least one cre
You can use a significance test to evaluate the hypothesis Ho:p(hat)=0.6 versus the two-sided alternative. The large-sample significance test for a population proportion is based on a t statistic.
What critical value t* should be used to calculate the margin of error for a confidence interval
Suppose the office is open five days per week. What is the expected number of new claims per week at this office?
A study of fill volumes is conducted at a food canning factory to determine the level of consistency between the two filling lines, A and B. A random sample of 11 cans taken from line A has a sampl
In an article about the cost of health care, Money magazine reported that a visit to a hospital emergency room for something as simple as a sore throat has a mean cost of $328 (Money, January 2009).
A time standard was set as 0.20 hour per unit based on the 80th unit produced. If the task has a 80 percent learning curve, what would be the expected time of the 100th, 200th, and 400th units? Show
Assume that 1300 births are randomly selected and exactly 331 of the births are girls. Use subjective judgement to determine the given outcome is unlikely
As the confidence level increases, while ME stays the same, does the required sample size increase, decrease, or stays the same?
For a linear model y = beta0 + beta1 x1 + beta2 x2 + beta3 x3 + beta4 x4 + e, what is the difference between testing H0: beta1 = beta2 and testing H0: beta1 = beta_2 = 0
Find the value of the test statistic z using: The claim is that more than 75% of adults always wear a seat belt in the front seat. A Harris Poll of 1012 adults resulted in 870 who say that they alw
One environmental group did a study of recycling habits in a California community. It found that 73% of the aluminum cans sold in the area were recycled. (Round your answers to four decimal places.)
In the following problem, check that it is appropriate to use the normal approximation to the binomial. Then use the normal distribution to estimate the requested probabilities.
Suppose that the waiting time for a customer service call is 5 minutes on average. Let X denote the waiting time (in minutes) until a representative picks up the phone. Find an appropriate probabili
Heights of 10 year old girls follow an approximately normal distribution with mean of 54.4 and a standard deviation of 2.7 inches. What proportion of 10 year old girls are shorter than 48 inches?
If 65 people are chosen at random, what is the probability that the sample mean of IQ scores will not differ from the population mean by more than 2 points? (Round your answer to four decimal places
Use the least squares regression line from question 1. =70.509 + 0.293 * circumference One man had his waist circumference measured at 110 cm and his intra abdominal fat measured at 125 cm. What is
A pair of fair dice is thrown. Find the probability P that the sum is 10 or greater if ; Label event and sample space