. If ? is a Poisson random variable with mean 100, then ? {X>120} approximately a. .02, b. .5 or c. .3?
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. If ? is a Poisson random variable with
a. .02,
b. .5 or
c. .3?
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- A student was analyzing a data set that was Normally distributed with a mean of . She calculated the z-score of a score z in the data set and looked up this value on a z-table (the same z-tables we have been using in class). The table gave a value of 0.4918 in this instance. Which of the following statements is true. O Any score in this data set has a 49.18% chance of being between 2 and z. O The score has a probability of 49.18. O The standard deviation of this data set is 0.4918 O The score x is 0.4918 standard deviations away from the mean.2. 4. Given the accompanying table, the random variable x represents the number of televisions in a household in a certain country. Determine whether or not the table is a probability distribution. (answer: YES or NO) Find the mean (one decimal place) Find the variance (two decimal places) Find the standard deviation (one decimal place.) The number TV in a household (X) 0.04 1 0.12 0.22 0.37 3. 0.14 0.11 5. • Previous Next ► 5- L AON tv 23 TS MacBook Airanswer the second question.
- Q4. Identify the incorrect statement below: The estimator, X from a random sample of X A. Is the mean of the population of X. B. Is an unbiased estimator of the population mean. C. Has an expected value equal to the mean of X. D. Is a random variable with a variance smaller than the variance of X. O A. A ОВ. В С. С O D. DIs the following random variable discrete or continuous? Let X represent the number of books in a random professor's office.5.
- 11.None2 of 4 (0 complete) Using the data given below, determine whether it would unusual for a household to have no HD televisions. The number of televisions (HD) per household in a small town Televisions 1 Households 26 445 655 1474 P(x) 0.010 0.171 0.252 0.567 Choose the correct answer below. O A. It would be unusual because the probability of having no HD televisions is less than 0.05. O B. It would not be unusual because the probability of having no HD televisions is more than 0.05. OC. It would not be unusual because 26 people have no HD televisions in the town. O D. It would be unusual because 26 people have no HD televisions in the town. Click to select your answer.
