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If the test contains 245 questions, what is the probability that Julie will score 77% or lower? (Use the normal approximation to the sampling distribution to solve this problem.)
In the early settlements of the US colonies, we can find a positive correlation between the number of barrels of rum that were sold and the number of churches that were built. What do you think the
A chocolate bar is considered underweight if it weights less than 8.0 oz How should the chocolate bar wrappers be labeled so that only 1% of such bars are underweight.
Construct a 95% lower confidence interval on mean battery life. Data is 25.5, 26.1, 26.8, 23.2, 24.2, 28.4, 25.0, 27.8, 27.3, & 25.7
February 2002 the Argentine peso lost 70% of its value compared to the United States dollar. This devaluation drastically raised the price of imported products.
Suppose that the scores of architects on a particular creativity test are normally distributed. Using a normal curve table, what percentage of architects have Z scores.
The average credit card debt for college seniors is $3262. if the debt is normally distributed with a standard deviation of $ 1100, find these probabilities that the senior owes at least $ 1200
State a hypothesis related to this study that would cause you to conduct a one-tailed test. State a hypothesis related to this study that would cause you to conduct a two-tailed test."
How large of a sample should be taken to estimate the proportion covered by the company if we want to be 95% confident that the sample percentage is within 3% of the actual percentage of the acciden
Charles entered a contest with 29 of his classmates (30 in all). A random draw will determine his prize. How many ways can this happen if one person will win a new pencil, another will win a trip to
A color- blind person is chosen at random. What is the probability of this person being male? Assume that there are an equal number of males and females
Suppose that on a certain section of I-95 with a posted speed limit of 65 mph. Using the empirical rule, find the percentage of vehicles with the following speeds on this section of I- 95.
A sample of size 1 is drawn from the uniform pdf defined over the interval [0,theta]. Find an unbiased estimator theta^2. Hint Is theta hat = Y^2 unbiased?
The Smoky Bear Trucking Company claims the average weight of a fully loaded moving van is 12,000 lb. The highway patrol decides to check this claim. A random sample of 30 Smoky Bear moving vans sho
Assuming this is literally true, how can it be explained? What facts and/or statistics would you need to know to expose this misleading claim?
the waiting time Y until delivery of a new component for an industrial operation is uniformly distributed over the interval from 1 to 5 days. The cost of this delay is given by U=2Y^2+3. Find the pr
A research firm conducted a survey to determine the mean amount steady smokers spend on cigarettes during a week. They found the distribution of amounts spent per week followed the normal distributi
If 14 citizens of the neighborhood are chosen. Find the probability that exactly 12 of them favor building the police substation.
Assume that the heights of adult Caucasian women have a mean of 63.6 inches and a standard deviation of 2.5 inches. If 75 women are randomly selected, find the probability that they have a mean hei
What is the probability that for a randomly selected bottle the amount the machine dispenses is within one standard deviation of he mean?
The mean weight of trucks traveling on a particular section of i-475 is not known. a state highway inspector needs an estimate of the mean. he selects a random sample of 49 trucks passing the weigh
Conduct a hypothesis test. What is the p-value and how much evidence is there to conclude that the power plants cooling system is not working properly.
In 2001, there were about 9 million commercial flights in the United States. Of one is selected at random, what is the probability that it involved a fatal accident?
Calculate the probability that theta hat falls within 0.2 of the theta given the parameter'e true value is 3.0 . Calculate the probability of the event asked in Part(a) assuming the sample size is 3 i
A random sample of 18 card purchases included 6 MasterCard, 7 Visa, and 5 store charges.The total sum of squares calculated (SStotal) at 7,114, and the sum of squares error (SSE) was 3776.0333. At t