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Material Type: Quiz; Professor: Almohalwas; Class: Introduction to Statistical Reasoning; Subject: Statistics; University: University of California - Los Angeles; Term: Winter 2011;
Typology: Quizzes
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Winter 2011 - Week 7 CCLE
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/ → 11W-STATS10-
/ → Quizzes / → Quiz 5, Due Monday, Feb. 14 2011 / → Review of preview
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Started on Thursday, February 17, 2011, 08:20 AM
Completed on Thursday, February 17, 2011, 08:20 AM
Time taken 18 secs
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Question 1 Marks: 1 In a recent issue of Science magazine, we read about a new computer-based test for ovarian cancer, "clinical proteomics" that exams a blood sample for the presence of certain patterns of proteins. Ovarian cancer, though dangerous, is very rare, affecting only one in 5000 women. The test is highly sensitive, able to correctly detect the present of ovarian cancer in 99.97% of women who have the disease. However, it is unlikely to be used as a screening test for the general public, because the test gives a false positive 5% of the time. Determine from the choices below the probability that a woman tests positive using this method. Choose one answer.
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Question 2 Marks: 1 Defective Tires The probability distribution of x, the number of defective tires on randomly selected automobiles at a certain inspection station, is given in the accompanying table.
x= defective 0 1 2 3 4
probability(x) 0.54 0.16 0.06 0.04 0.
After you calculate the expected number (the mean) of defective tires, determine the probability that x exceeds the expected value.
Choose one answer.
Question 4 Marks: 1 What percent of dark-eyed students wear corrective lens? Choose one answer.
D. None of these values.
E. 23/60 = 38.3%
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Question 5 Marks: 1 What percent of those students who wear lens are dark-eyed? Choose one answer.
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Question 6 Marks: 1 If you find a pair of prescription sun glasses after class, what are the chances that the glasses belong to a dark-eyed student? Choose one answer.
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Question 7 Marks: 1 Here is a contingency or two-way table for those aboard the Titanic, classsified according to class of ticket and whether or not they survived.
First Second Third Crew Total
Survived 203 118 178 212 711
Died 122 167 528 673 1490
Total 325 285 706 885 2201
Use the data from the table for problems 1-5.
If you select person aboard the Titanic, what are the chances that that person is a survivor? Choose one answer.
B. None of these values. C. 203/711 = 28.6% D. 1490/2201 = 67.7% E. 203/325 = 62.5%
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Question 8 Marks: 1 Imagine that you are taking a multiple-choice test in a language which is completely unfamiliar to you. Suppose the test has five questions with four choices for each answer and only one of the four choices is correct. If you
If we select one record for those who wore a seatbelt, what are the chances that the person survived? Choose one answer.
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