Quiz document | Mathematics homework help





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1.  Evaluate   (probability of success in a Bernoulli trial) for the following values:


             n = 10    x = 2    p = 0.6








                                                                        Answer:  P(2) =  ___________________________




2. – 3.  The following full IQ scores were obtained by testing a group of children who live near a lead smelter and are exposed to high concentrations of lead in the environment:
























            2.  Complete the following frequency table:



IQ Interval


Relative Frequency

67.5 – 72.5




72.5 – 77.5




77.5 – 82.5




82.5 – 87.5




87.5 – 92.5




92.5 – 97.5




97.5 – 102.5




102.5 – 107.5




107.5 – 112.5






3.  Using the UNGROUPED sample data, find the mean; median; and mode(s), if any:














            Answers:  Mean ______________  Median  _________________   Mode ___________



4. – 5.  A social psychologist gave a survey to 8 active members of a small political action group about how many hours they put into the group’s activities each week. The results were as follows: 41, 24, 44, 33, 40, 41, 19, and 30.



            4.  Compute the sample mean, median, and mode















            Answers:  Mean ______________  Median  _________________   Mode ___________




            5.  Compute the sample variance and sample standard deviation.


















            Answers:  Variance  ___________________  Standard Deviation  __________________




6. – 7.  A study of blood cholesterol levels using samples from 80 participants provided the following data:


Blood Cholesterol Level (mg/dl)(Interval)


149.5 – 169.5


169.5 – 189.5


189.5 – 209.5


209.5 – 229.5


229.5 – 249.5


249.5 – 269.5


269.5 – 289.5


289.5 – 309.5




                        6.  Compute the mean and median:













                                                Answers:  Mean ______________  Median  _________________  




                        7.  Compute sample standard deviation.













                                                Answer:  Standard Deviation  __________________________


8.  Identify the graphics presented below (enter letter of choice which best describes graph type):






            _________                                   __________                                   __________               


Choices:          a.  broken line graph                c.  double bar graph                e.  ogive                                               b.  histogram                           d.  divided bar graph              f.  pie graph    








9.  One of the initial clinical trials of the anti-math anxiety drug SHOVITALL™ tested for the presence of headaches as a side effect.  In the trial, 450 subjects were treated with 80mg of the drug, and 2.2% of the subjects developed headaches.  In the binomial distribution of these 450 subjects, what are the mean and standard deviation?   Use p = 0.022













                        Answers:  Mean = _______________  Standard Deviation = _________________







10.  Multiple Choice:  According to the American Chemical Society, there is a 0.9 probability that in the United States, a single randomly selected $1 dollar bill is tainted with traces of cocaine.  Assume eight $1 dollar bills are randomly selected.  What is the probability that six (6) or more of the $1 dollar bills randomly selected will be tainted with traces of cocaine?



A.    P (≥ 6) =  0.962                                         C.   P (≥ 6) =  0.149

B.     P (≥ 6) =  0.750                                         D.   P (≥ 6) =  0.813















                                                                                    Answer:  _________________________

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