SDSU Medin STATS Midterm2A_Fall07

SDSU Medin STATS Midterm2A_Fall07 - Instructor_ Class...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Instructor____________________ Name_______________________ Class Meeting Time___________ Red Id______________________ STAT 119 EXAM TWO November 14, 2007 Form A You have 90 minutes to complete this exam. Mark your answers neatly on the exam and be sure to show all your work . Please round your answers to four digits after the decimal. Make sure to put your final answers neatly within the answer boxes (when provided). Please CIRCLE the correct answer and use CAPITAL LETTERS in the space provided for the multiple choice. BE CAREFUL! GOOD LUCK! Page 1 Total________ Page 2 Total________ Page 3 Total________ Page 4 Total________ Page 5 Total________ Page 6 Total________ Page 7 Total________ Page 8 Total________ Page 9 Total________ Total_____________________
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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
Background image of page 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.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 11

SDSU Medin STATS Midterm2A_Fall07 - Instructor_ Class...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online