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1) All the U.S. households that owned at least one television set, 83% had two or more sets. A local cable company canvassing the town to promote a new cable service found that of the 300 randomly selected households visited, 240 had two or more television sets. At 0.05, is there sufficient evidence to conclude that the proportion is less than the one in the report?
2) The average one-way airfare from Pittsburgh to Washington D.C., is $236. A random sample of 20 one-way fares during particular month had a mean of $210 with a standard deviation of $43. At 0.02, is there sufficient evidence to conclude a difference from the stated mean?
3) The number of carbohydrates found in a random sample of fast-food entrees is listed. Is there sufficient evidence to conclude that the variance differs from 100? Use the 0.05 level of significance. Data: 53,46,39,39,30,47,38,73,43,41.
the manager of a supermarket found that 72 of the shoppers who taste a free sample of a food item will buy the item.
compute the row percentages and identify the percent frequency distributions of in-come for households in which the
Suppose a small bicycle manufacturer makes cheap bikes that sell for 180$ each. The total cost of producing x bikes (in $) is given by c(x)=6000+240x-0.8x^2, where x is up to 200 bikes.
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.
he Bureau of Labor Statistics provides compensation information on and services for various positions. As of May 2008, the national average salary for an RN (registered nurse) was $65,130. Suppose the standard deviation is $9385. For a random sample ..
Can we conclude at a 98% level of confidence, that the mean number of hours per day using the computer by students at IUP is the same as the typical student's usage?
question an instructor graded a large number of midterm exams and she considers that the test scores are normally
you are picking a bouquet of 20 flowers for your mother at random from a garden with 25 coneflowers 35 daisies and 42
Assume the chief does not want his officers to cite a car for speeding unless they are 99% sure that it is travelling at 58 miles per hour or faster. What is the minimum estimate of speed at which a car should be cited for speeding?
the metal body for a spark plug is made by a combination of cold extrusion and machining. the occurrence of surface
A newspaper finds that the mean number of typographical errors per page is five. Find the probability that:
Confirm whether given random variable is binomial distribution or not. If this experiment is finished with replacement, explain why.
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