stat 200 hw 2

# stat 200 hw 2 - c No the cities do not represent trials and...

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2.53) c) The interquartile range measures the range from the first quartile to the third. With that in mind, the IQR for males is larger as it is 7 (17-10), whereas the IQR for females is 5 (15-10). d) 23 – 6 = 17 e) 23 – 6 = 17 2.81) The value of the interval of two standard deviations is -6.1 – 22.7. This is evidence that the curve is not bell-shaped because a negative amount is not possible given the topic of hours spent on the computer, thus the data must be left-skewed. 8.1) a) continuous b) discrete c) continuous d) discrete e) discrete 8.10) a) (.14 + .37 + .29) = .8 b) (.37 + .29) = .66 c) (.15 + .37 + .29 + .05) = .86 8.19) a) .05 + 1(.60) + 2(.30) + 3(.05) = 1.4 b) The expected value in this example is the mean value for the sample, which is to say that the expected value is that the Brann family would have 1.4 children. c) E(X) is not a possible outcome for the Brann family as you can not have a fraction of a child. 8.33) a) Yes. n = 10, p = 1/2

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Unformatted text preview: c) No, the cities do not represent trials, and the probability of success varies between cities. d) No, because the probability of success varies from student to student. 8.38) a) It is not met because the probability of success varies from game to game. b) It is not met because the number of trials is not set in advance, as the woman could buy a varied number of tickets until she is able to win 3 times. c) Not met because the outcomes are not independent from one trial to the next. If you draw an ace, it decreases the probability that the next card drawn will be an ace. 8.43) a) expected value = 5 standard deviation = .158 It is not a normal binomial as both (n*p) and n(1-p) are less than 10. c) expected value = 500 standard deviation = 20 It is a normal binomial as both (n*p) and n(1-p) greatly exceed 10. 8.84) a) k 3 4 5 6 7 P(X=K) .07 .21 .73 .98 1 b) (.07 + .14 + .52) = .73 c) (.25 + .02) = .27...
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## This note was uploaded on 10/29/2008 for the course STAT 200 taught by Professor Barroso,joaor during the Spring '08 term at Penn State.

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stat 200 hw 2 - c No the cities do not represent trials and...

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