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# Total number of devices this system can talk to 16

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total number of devices this system can talk to? - 16 The standard deviation of all possible sample proportions increases as the sample size increase. –False All continuous random variables are normally distributed -False The number of defective pencils in a lot of 1000 is an example of a continuous random variable. –False The normally distributed variables can have equal means and unequal standard deviations. –True The mean and median are the same for a normal distribution -True In a statistical study, the random variable X = 1, if the house is colonial and X = 0 if the house is not colonial, then it can be stated that the random variable is continuous. False The price to earning ratio for firms in a given industry is distributed according to normal distribution. In this industry, a firm with a standard normal variable value of Z = 1: -Has an above average price to earnings ratio The Eastern State University law school ranks graduating students based on their cumulative GPA and assigns a normal z score to each student. Regina Monson just completed all of the requirements for her law degree and her z score is 1.34. Based on her z score, we can conclude that she is in the upper _____ of her graduating class: -10% The standard deviation of a standard normal distribution is always equal to 1. True A students grade on examination was transformed to a z value which is negative. Therefore, we know that he scored: - Below the mean The mean life of pair of shows is 40 months with a standard deviation of 8 months. If the life of the shoes is normally distributed, how many pairs of shoes out of one million will need replacement before 36 months? -308,500

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The relationship between the standard normal random variable Z and normal random variable X is that: -The standard normal variable Z counts the number of standard deviations that the value of the normal random variable X is away from its mean The normal approximation of the binomial distribution is appropriate when: -np^3 5 and n(1-p)^3 5 A continuous probability distribution having a rectangular shape where the probability is evenly distributed over an interval of numbers is called a uniform probability distribution. –True The Central Limit Theorem states that as the sample size increases, the population distribution more closely approximates a normal distribution. –False If the random variable of x is normally distributed, ___% of all possible observed values of x will be within three standard deviations of the mean, -99.73 A continuous random variable may assume only integer values in a given interval -False The mean of the sampling distribution of X is always equal to the mean of the sampled population -True The z value tells us the number standard deviations that a value x is from the mean -True If a population distribution is known to be normal, then it follows that -None of the above Another name(s) for the normal distribution is (are…): -Both A and B (Bell Shaped and Gaussian) EXAM 2 Question 1   (4 points) A confidence interval increases in width as  Student response: Percent Value Correct Response Student Response Answer Choices 0.0% a. The level of confidence
increases 0.0% b. n decreases 0.0% c. s increases 100.0% d. All of the above

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• Fall '08
• ZANAKIS

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