MATH 534 Week 3 Quiz

1. Question: Given a random variable X follows a Normal distribution with mean 10 and standard deviation 2. Question: Scores on a certain exam are normally distributed with a mean of 90 and a variance of 25. 3. Question: A normal distribution is defined by two parameters, the mean and the Standard Deviation 4. Question: If for a certain x value in a normal distribution with mean equal to 4 the z-value is such that Larger than 4 5. Question: Suppose X is normally distributed with mean 50 and standard deviation 4. Find the probability 0.9876 6. Question: Suppose X is normally distributed with mean 20 and standard deviation 4, find the value x0 12.16 7. Question: According to an NRF survey conducted by BIGresearch, the average family spends about $23 8. Question: According to the Air Transport Association of America, the average operating cost of an MD 9. Question: In a recent year, the average daily circulation of the Wall Street Journal was 2,276,207. Sup On what percentage of days would circulation pass 1,790,000? 10. Question: Selection of the samples based on the convenience of the researcher is an example of 11. Question: Judgment sampling is an example of _ 12. Question: Suppose the age distribution in a city is as follows. 13. Question: Suppose samples of size 100 are drawn randomly from a population that has a mean 14. Question: The Aluminum Association reports that the average American uses 56.8 pounds of aluminum 15. Question: The U.S. Bureau of Labor Statistics released hourly wage figures for various country. Suppose 37 manufacturing workers are selected randomly from across Switzerland an 0.6617 Suppose 34 manufacturing workers are selected randomly from across Japan. What is 0. 0606 Suppose 49 manufacturing workers are selected randomly from across the United Stat 0.0212 16. Question: If reasonably large sized samples (i.e., samples of 30 elements or more) are drawn from a normally distributed 17. Question: A random sample of n = 100 observations is selected from a population with mean 20 and 0.2514 18. Question: A survey of 2645 consumers by DDB Needham Worldwide of Chicago for public relations What is the probability that more than 910 consumers claim that how a company handl 0.0136 What is the probability that fewer than 1,125 consumers claim that quality of product is 0.00003 What is the probability that between 81% and 84% of consumers claim that how a com 0.1658on 5, what is the probability that X lies within one standard deviation of the mean?