4.2 HW
Use the data in the following table, which lists drive-thru order accuracy at popular fast food chains. Assume that orders are randomly selected from those included in the table. Drive-thru Restaurant A B C D Order Accurate 340 277 239 150 Order Not Accurate 38 60 37 14 If three different orders are selected, find the probability that they are all from Restaurant Upper D.
.0029
acc: 330 275 241 144 not: 34 56 36 18
.0146
principle redundancy
.082 .00672 .00055 Yes, because total malfunction would not be impossible, but it would be unlikely. Your answer is correct.
Use the data in the following table, which lists drive-thru order accuracy at popular fast food chains. Assume that orders are randomly selected from those included in the table. Drive-thru Restaurant A B C D Order Accurate 313 267 236 126 Order Not Accurate 32 60 33 14 The probability of getting an order from Restaurant C or an order that is not accurate is
.347 The events (are not) disjoint because it (is) possible to (receive an inaccurate order from Restaurant C.)
accurate: 335 267 240 123 not accurate: 33 51 31 10 the probability food that is not from Restaurant A is
.662
Use the data in the following table, which lists drive-thru order accuracy at popular fast food chains. Assume that orders are randomly selected from those included in the table. Drive-thru Restaurant A B C D Order Accurate 333 277 237 135 Order Not Accurate 35 59 38 12 The probability of getting an order from Restaurant A or an order that is accurate is
.903 The events (are not) disjoint because it (is) (possible to receive an accurate order from Restaurant A.)
a certain group of women has a 0.84% rate of r4ed/green color blindness. if a women randomly selected, what is the probability that she does not have red-green color blindness?
.9916
certain women .84% red/green
.9916
A certain group of women has a 0.26 % rate of red/green color blindness. If a woman is randomly selected, what is the probability that she does not have red/green color blindness? What is the probability that the woman selected does not have red/green color blindness?
.9974
When randomly selecting an adult, A denotes the event of selecting someone with blue eyes. What do P ( A) and Upper P( A ) *different looking parenthesis * represent?
P(A) represents the probability of selecting an adult with blue eyes P(A) *diff parenthesis* represents the probability of selecting an adult who does not have blue eyes.
What does P(B|A) represent?
The probability of event B occurring after it is assumed that event A has already occurred
Use the following results from a test for marijuana use, which is provided by a certain drug testing company. Among 149 subjects with positive test results, there are 29 false positive results; among 152 negative results, there are 4 false negative results. If one of the test subjects is randomly selected, find the probability that the subject tested negative or did not use marijuana
The probability that a randomly selected subject tested negative or did not use marijuana is . 601
A research center poll showed that 84% of people believe that it is morally wrong to not report all income on tax returns. What is the probability that someone does not have this belief?
The probability that someone does not believe that it is morally wrong to not report all income on tax returns is .16
The principle of redundancy is used when system reliability is improved through redundant or backup components. Assume that a student's alarm clock has a 17.8 % daily failure rate. Complete parts (a) through (d) below.
What is the probability that the student's alarm clock will not work on the morning of an important final exam? . 178 If the student has two such alarm clocks, what is the probability that they both fail on the morning of an important final exam? 0.03168 What is the probability of not being awakened if the student uses three independent alarm clocks? 0.00564 Yes, because total malfunction would not be impossible, but it would be unlikely.
Selections made with replacement are considered to be _______.
independent
Two events A and B are _______ if the occurrence of one does not affect the probability of the occurrence of the other.
independent
There are 15,958,866 adults in a region. If a polling organization randomly selects 1235 adults without replacement, are the selections independent or dependent? If the selections are dependent, can they be treated as independent for the purposes of calculations?
independent or dependent? The selections are dependent, because the selection is done without replacement. if dependent, can they be treated as independent for the purpose of calculations? Yes, because the sample size is less than 5% of the population.
use the data in the following table, which lists drive-thru accuracy at popular fast food chain. Order accurate: 327 263 237 120 not accurate: 37 54 31 20
probability of getting an order from restaurant C or an order that is not accurate is .348
accurate: 332 265 249 148 not accurate: 40 60 37 13
probability of getting food that is not from restaurant A .675
marijuana 140 subjects
selected tested neg or did not use .63
order accurate: 318 264 236 136 not accurate: 34 51 39 18
the probability of getting an order from restaurant A or an order that is accurate is .901
Use the data in the following table, which lists drive-thru order accuracy at popular fast food chains. Assume that orders are randomly selected from those included in the table. Drive-thru Restaurant A B C D Order Accurate 329 275 247 148 Order Not Accurate 30 56 36 13
the probability of getting food that is not from restaurant A .683
Use the following results from a test for marijuana use, which is provided by a certain drug testing company. Among 141 subjects with positive test results, there are 21 false positive results. Among 160 negative results, there are 4 false negative results
total number: 301 total did not use marijuana: 177 probability that a randomly selected subject did not use marijuana : .588
A picture of line segments branching out from one starting point illustrating the possible outcomes of a procedure is called a
tree diagram