#10 - Los Angeles Mission College
Math 227 Winter 2014 Practice Final
#1 True/False
______________ (a) The standard deviation, s, is not effected by extreme data.
______________ (b) If the population distribution is not normally distributed,
the distribution for the sampling mean will be approximately
normally distributed for n = 20.
______________ (c) 5/3 cannot be an answer for a probability.
______________ (d) On a five possible answers multiple-choice question, the
probability of answering the question correctly by random
guessing is 1/2.
______________ (e) With the same level of confidence and the same standard
deviation, as n increases the width of the confidence interval
increases.
______________ (f) The claim is always the same as Ho.
#2 A card is selected randomly from a deck of cards, what is the probability that a face
card (Jack, Queen, King) or a club will be selected.
#3 Two dice are tossed. What is the probability of getting a sum of 8?
#4 A carton contains 12 eggs, 3 of which are cracked. If we randomly select 2 eggs,
one after the other without replacement, what is the probability that both of the
cracked eggs are selected?
#5 Listed below are the Titanic mortality data.
Men Women Boys Girls
Survived 332 318 29 27
Died 1360 104 35 18
(a) If we randomly select someone who was aboard the Titanic, what is the
probability of getting a man or a person who survived?
(b) What is the probability of getting a woman, given the selected person died?
#6 (a) Find P(x = 3) for the following probability distribution table.
x 1 2 3 4
P(x) 0.12 0.21 ? 0.18
(b) Find the mean of the probability distribution.
#7 It was found that 55% of American victims of health care fraud are senior
citizens. If 20 victims are randomly selected,
(a) find the probability that exactly 14 are senior citizens.
(b) find ( and ( for this binomial distribution.
#8 The average amount of rain per year in Greenville is 49 inches. The standard
deviation is 8 inches. Find the probability that next year Greenville will receive
the amount of rainfall in between 46 and 54 inches.
#9 If the average score of a reading test is 122.6 with the standard deviation of 18, find
the cutoff-score for the bottom 5%. Assume the variable is normally distributed.
#10 The average annual salary in Pennsylvania was $24,393 in 1992. Assume that
salaries were normally distributed for a certain group of wage earners, and the
standard deviation of this group was $4362. Find the probability that, for a
randomly selected sample of 25 individuals, the mean salary was less than
$26,000.
#11 A researcher is interested in estimating the average monthly salary of sports reporters
in a large city. He wants to be 99% confident that his estimate is correct. If ( = $1100,
how large a sample must be selected if he wishes to be accurate to within $150?
#12 A sample of 500 nursing applications included 60 from men. Find the 90% confidence
interval of the true proportion of men who applied to the nursing program.
#13 An attorney claims that more than 25% of all lawyers advertise. A sample of 200
lawyers in a certain city showed that 63 had used some form of advertising.
At ( = 0.05, is there enough evidence to support the attorney’s claim?
#14 A state executive claims that the average number of acres in western Pennsylvania
state parks is less than 2000 acres. A random sample of five parks is selected, and
the number of acres is shown.
959 1187 493 6249 541
(a) Use your calculator to find the sample mean and the sample standard deviation.
(b) At ( = 0.01, is there enough evidence to support the claim?
#15 Heights of men have a bell-shaped distribution with a mean of 176 cm and a standard deviation of 7
cm. Using the empirical rule, what is the approximate percentage of men between 155 cm and 197
cm?
#16 Jim gets test grades of 79, 75, 82, and 85. He gets a 94 on his final exam. Find the weighted mean if the tests each count for 10% and the final exam counts for 60% the final grade.
#17 If Z is a standard normal variable, find the probability that Z is greater than -2.89.
#18 Determine whether the given procedure results in a binomial distribution. Why or why not?
Toss a coin 25 times, keeping track of the number of tails.
#19 There are 9 members on the board of directors for a hospital. If they must elect a chairperson, vice chairperson, and a secretary, how many different slates of candidates are possible?
#20 For the following data: 14 15 8 11 8 8 9 1 12 8 7 15
(a) Find the Mea
(b) Find the Median
(c) Find the Mode
(d) Find the Five-number summary (Low, Q1, Q2, Q3, High)
(e) Construct a boxplot
#21 Find the z value to the left of the mean so that 60.64% of the area under the distribution
curve lies to the right of it.
#22 Full-time Ph.D. students receive an average of $12,837 per year. If the average salaries are
normally distributed with a standard deviation of $1500, find the probability that the student
makes between $13,000 and $14000.
#23 Given the equation of the regression line [pic] and the correlation
coefficient [pic], find the best predicted value of y for x = 2.00. What is r?
#24 State the Central Limit Theorem or four requirements for a Binomial Experiment.
#25 Find the p-value for a right tailed test with observed [pic]
#26 One survey showed that among 785 randomly selected subjects who completed four
years of college, 144 smoke. Use [pic] to test the claim that the percentage (p) of
smoking among those with four years of college is less than the 27% rate for the general
population.
#27 The mean is [pic] and the standard deviation is [pic], find the probability that X is between 135.0 an d143.2. X has a normal distribution
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