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Question: According to Fortune, on February 27, 2007, the average stock in all U.S. exchanges fell by 3.3%.7 If a random sample of 120 stocks reveals a drop of 2.8% on that day and a standard deviation of 1.7%, are there grounds to reject the magazine's claim?
professor fair believes extra time does not improve grades on exams. he randomly divided a group of 300 students into
Suppose that highway gas mileage rates for both of these cares are uniformly distributed over a range of 20 to 30 mpg. What proportion of these cars would fall into the 22 to 27 mpg range? Compute the proportion of cars that get more than 28 m..
a pysics lab instructor wants to estimate the time required for physic students to complete a required experiment. from
Use a 0.01 significance level to test the claim that most people believe that the Loch Ness monster exists. How is the conclusion affected by the fact that Internet users who saw the question could decide whether to respond.
Find a 95% confidence interval for the mean price of all summer sleeping bags.
given two samples a and b with population size of a 30 sample variance of a 45.3 and a population size of b 25 sample
A sample of 50 ads reveals a sample average of 5.1 weeks with a sample standard deviation of 2.3 weeks. State the null and alternative hypotheses and carry out the test at the 5% level of significance.
Omar Haaris receives 5000 tripods annually from Top-Grade Supplier to meet his annual demand. Omar runs a large photographic outlet, and the tripods are used primarily with 35mm cameras. The ordering cost is $15 per order, and the carrying cost is..
Use a computer to simulate the numbers drawn for the Cash 5 lottery game 1000 times, and draw a histogram for the values of H = highest number drawn. Compare your histogram to the one shown in given Figure.
the random variable x has a binomial distribution with parameters p0.20 and p0.156. use an appropraite distribution to
question 1 a company sells packets of biscuits that they claim on average contains at least 20 g biscuits in each
Confidence interval for the true mean and Evaluate the 95% confidence interval for the true mean advertising expense?
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