SDSU Medin STATS Midterm2A_Fall07

# SDSU Medin STATS Midterm2A_Fall07 - Instructor Class...

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A Multiple-Choice questions are worth 2 points: 1. A survey was conducted to determine the proportion of cat owners who vaccinate their pets on a yearly basis. Based on the response of 200 cat owners a 90% confidence interval was calculated to be (0.57, 0.68). What can be concluded? A. We know that the true proportion of the cat owners who vaccinate their pets is between 0.57 and 0.68. B. We are 90% confident that between 57% and 68% of the cat owners vaccinate their pets annually C. We are 90% confident that the sample proportion of cat owners who vaccinate their pets is between 0.57 and 0.68. D. 90% of the cat owners vaccinate their pets annually Answer 2. An experiment is set up in which tomato plants are placed into groups by color and then randomly assigned to fertilizer treatments. This is an example of which type of design? A. Simple Random Sample. B. Matched pairs. C. Block design. D. None of the above. Answer 3. About 1 in 10,000 people are born with hemophilia A. We randomly select 5,000 newborn babies. Let success be that a baby has hemophilia A. Can we use the normal approximation to estimate the probability that exactly two have hemophilia A? A. No, because np is too small. B. Yes, because n is very large. C. Yes, because n(1-p) is greater than 10. D. No, because 5,000 are less than 10% of the babies that are born every year. Answer 4. P(A) = 0.32, P(B A) = 0.10, if A and B are dependent, what is P(A | B)? A. 0.032 B. 0.32 C. 0.3125 D. We cannot calculate this probability using the given information Answer Total_____________(8) 2
A 5. The annual rainfall in Southern California is normally distributed with a mean of 254 mm and a standard deviation of 9 mm. Suppose we collect the rainfall totals in Southern California over a period of 9 years. Which of the following correctly describes the distribution of the sample mean? A. X ~ N(254,9) B. X ~ AN(254,9) C. X ~ N(254,3) D. X ~ AN(254,3) Answer 6.

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SDSU Medin STATS Midterm2A_Fall07 - Instructor Class...

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