All Matches

Solution Library

Expert Answer

Textbooks

Search Textbook questions, tutors and Books

Oops, something went wrong!

Change your search query and then try again

Result Not Found

Books FREE
Tutors
Study Help
Hire a Tutor
AI Study Help New

Search
Sign In
Register

study help
mathematics
statistics

Questions and Answers of Statistics

Approximately 40% of the Wisconsin population have type O blood. If 4 persons are selected at random to be donors, find P[at least one type O].
The primary cooling unit in a nuclear power plant has reliability .999. There is also a back-up cooling unit to substitute for the primary unit when it fails. The reliability of the back-up unit is
An accountant screens large batches of bills according to the following sampling inspection plan. She inspects 4 bills chosen at random from each batch and passes the batch if, among the 4, none is
In 80% of the cases an electronic scanner is successful in detecting flaws in a material specimen. Three material specimens containing flaws will be tested with the scanner. Assume that the tests are
Refer to Exercise 4.52. Given that a landfill selected at random is found to have a high concentration of mercury, what is the probability that its concentration is:(a) High in barium?(b) Low in both
Of the patients reporting to a clinic with the symptoms of sore throat and fever, 25% have strep throat, 40% have an allergy, and 10% have both. (a) What is the probability that a patient selected at
Consider tossing two fair coins and the events A: Head in the first toss B: Head in the second toss C: Both heads or both tails in the two tosses (a) Verify that the property of independence holds
Repeat Example 20 but change
Carol and Karl both solve difficult computer problems that come to the student desk. Carol makes 60% of the repairs and Karl 40%. However, Carol's repairs are incomplete 4% of the time and Karl's are
In a county, men constitute 60% of the labor force. The rates of unemployment are 5.1% and 4.3% among males and females, respectively. (a) In the context, of selecting a worker at random from the
Consider the following experiment: A coin will be tossed twice. If both tosses show heads, the experiment will stop. If one head is obtained in the two tosses, the coin will be tossed one more time,
Refer to Example 21 concerning spam but now suppose that a new list is available. Among the 1000 messages, the 350 spam messages have 310 that contain words on this list and the 650 normal messages
In professional tennis, the server often tries to ace her opponent on the first serve. If the first serve is out of bounds, the server tries to be more accurate with the second and last serve. From
A large firm has 85% of its service calls made by a contractor, and 10 of these calls result in customer complaints. The other 15% of the service calls are made by their own employees, and these
Refer to Example 22 where a manufacturer had difficulty getting enough LED screens. Now suppose, because of the shortage, the manufacturer had to obtain 30% of the screens from the second supplier
Evaluate: (a) (6/3) (b) 10/4 (c) (22/2) (d) (22/20) (e) (30/3) (f) (30/27)
Of 10 available candidates for membership in a university committee, 6 are men and 4 are women. The committee is to consist of 4 persons. (a) How many different selections of the committee are
If a coin is tossed 11 times, the outcome can be recorded as an 11-character sequence of H's and T's according to the results of the successive tosses. In differently, in how many ways can one choose
A psychologist will select 5 preschool children from a class of 11 students in order to try out new abuse awareness material. (a) How many different selections are possible? (b) Suppose 4 of the 11
Out of 12 people applying for an assembly job, 3 cannot do the work. Suppose two persons will be hired. (a) How many distinct pairs are possible? (b) In how many of the pairs will 0 or 1 person not
After a preliminary screening, the list of qualified jurors consists of 10 males and 7 females. The 5 jurors the judge selects from this list are all males. Did the selection process seem to
There are four elementary outcomes in a sample space. If P(e1) = .3, P(e2) = .4, and P(e3) = .2, what is the probability of e4?
Suppose you participate in a lottery conducted by a local store to give away four prizes. Each customer is allowed to place 2 cards in the barrel. Suppose the barrel contains 5000 cards from which
A batch of 20 used automobile alternators contains 4 defectives. If 3 alternators are sampled at random, find the probability of the event (a) A = [None of the defectives appear] (b) B = [Exactly two
Refer to Exercise 4.91. Suppose the sampling of 3 alternators is done by randomly choosing one after another and without replacement. The event A can then be described as G1G2G3, where G denotes
An instructor will choose 3 problems from a set of 7 containing 3 hard and 4 easy problems. If the selection is made at random, what is the probability that only the hard problems are chosen?
Nine agricultural plots for an experiment are laid out in a square grid as shown. Three plots are to be selected at random.(a) Find the probability that all 3 are in the same row.(b) Find the
In one area of an orchard, there are 17 trees, of which 10 are bushy and 7 lean. If 4 trees are randomly selected for testing a new spray, what is the probability that exactly 2 bushy trees are
Referring to Exercise 4.96, now suppose that the trees are located in two rows: Row A has 8 trees of which 4 are bushy, and row B has 9 trees of which 6 are bushy. Two trees are to be randomly
An advertisement seeking volunteers for a clinical research draws 11 respondents. Of these respondents, 5 are below age 30 and 6 are over 30. The researcher will randomly select 4 persons to assign
Water collected in a single bottle from a river is divided into eight specimens. Two specimens are randomly selected and sent to Lab A, two to Lab B, two to Lab C, and two to Lab D. The amount of
A psychologist investigating the connection between music and memory, randomly assigns subjects to one of three treatment groups. The first group hears white noise, the second Mozart, and the third
Based on the current General Social Survey, an index is created from the few questions asking about the degree of confidence in government. Six age groups are compared. Suppose the values of the
Using the data from Exercise 14.1, test for equality of means using a = .05. Treatment Observations A............... 5 9 B............... 8 4 C............... 4 2 D............... 7 9
Test for equality of means based on the data in Exercise 14.2. Take a = .05.In Exercise 14.2
Three bread recipes are to be compared with respect to density of the loaf. Five loaves will be baked using each recipe.(a) If one loaf is made and baked at a time, how would you select the order?(b)
Test for equality of means based on the travel expense data in Exercise 14.6. Take a = .05.In Exercise 14.6
Refer to the data on reading levels in Exercise 14.7. Test for equality of means. Take a = .05In Exercise 14.7
Taking a = .05 and n - k = 26, determine the appropriate percentile of the t distribution when calculating the multiple-r confidence intervals with (a) m = 3 and (b) m = 5.
Construct the 90% multiple-f confidence intervals using the sound distortion data in Example 1.
As suggested by the photo in the beginning of this chapter, consumers can rate new HDTVs. Many Web sites use a five point scale. Although the individual responses are not normal, the central limit
Subjects must press a button when they hear a signal. The three treatments are three different intensities of the signal. The time elapsed between presentation of the signal and when the button is
A study was conducted to examine the degree that the length of gestation influences school achievement for children born in the normal range of 37 to 41 weeks gestation. Academic achievement was
Determine the expression for the length of the t interval for μ1 - μ2 and the multiple-r interval for μ1, - μ2 when m = 10. The ratio of lengths does not depend on the data. Evaluate this ratio
Referring to the sound distortion data in Example 1, graph the residuals in (a) A dot plot using all of the residuals. (b) Individual dot plots for each model of ear buds.
Referring to the density of bread data in Exercise 14.14, plot the residuals(a) In a dot plot using all of the residuals.(b) Individual dot plots for each recipe.In Exercise 14.14
Refer to the MINITAB commands in Exercise 14.37 but also check the box Store residuals. Next, referring to Exercise 6.55, graph the residuals from an ANOVA of the iris data in Exercise 14.38 (a) In a
The hours of relief are measured under a placebo, Brand A, and Brand B sinus medicines. Call these treatment 1, treatment 2, and treatment 3, respectively. They are each given in succession, in
Suppose you wish to compare three different brands of tick collars for dogs. You have available three of each of the breeds Poodle, Lab, Collie, and Dachshund. Explain how you would assign a brand of
Refer to Exercise 14.25. Present the ANOVA table. What conclusions can you draw from the two F tests? Take a = .05.
The yield, in pounds, of three types of heritage tomatoes (treatments) is obtained after planting them in three equal sized plots within a site (block). Types are randomly assigned to plots. A total
Three loaves of bread, each made according to a different recipe, are baked in one oven at the same time. Because of possible uncontrolled variations in oven performance, each baking is treated as a
It was decided to vary the experiment in Exercise 14.1 by dropping Lab D. Water from a single collection bottle was divided into eleven specimens. The amount of heavy metals (ppm) is measured for
Refer to Exercise 14.28. Present the ANOVA table. What conclusions can you draw from the two F tests? Take a = .05.In Exercise 14.28.
As part of a cooperative study on the nutritional quality of oats, 6 varieties of oat kernels with their hulls removed are subjected to a mineral analysis. The plants are grown according to a
Referring to Exercise 14.31, suppose that variety 6 is of special interest. Construct simultaneous 90% confidence intervals for the differences between the mean of variety 6 and each of the other
Food scientists investigated whether making a cheese sauce by a continuous process or batch process made any difference to taste. They also included a third treatment, a carefully selected ideal
Compute the sums of squares and construct the ANOVA table for the data given in Exercise14.33.In Exercise 14.33.
Refer to the data on travel expenses in Exercise 14.6 and the F-test in Exercise 14.15. It is the ordering of the population means, and the sizes of their differences, that is the key finding of
As part of the multi lab study, four fabrics are tested for flammability at the National Bureau of Standards. The following burn times in seconds are recorded after a paper tab is ignited on the hem
Using the computer. MINITAB can be used for ANOVA. Start with the data on each treatment, from Example 1, set in separate columns. The sequence of commands and output is:Use computer software to
The iris data described in Example 6 are given in the stem-and-leaf diagrams below.The MINITAB output for the analysis of the iris data is given below. Individual 95% CIs For Mean Based on Pooled
Three different chemicals are compared on their ability to make fabric stain-resistent. Four bolts of cloth, manufactured weeks apart, are used. Because the results are expected to vary from bolt of
The abilities of six different brand athletic socks to wick moisture are rated. The rating is based on the time to reach 1% moisture content after being subjected to a gentle mist. Use the relations
Refer to the output here concerning the time (min) it took four different persons (blocks) to complete three different tasks.(a) Identify the SSE and its degrees of freedom.(b) Are the block means
Spots cannot always be removed by dry cleaning. Suppose the records from four different dry cleaning establishments yield the following data on number of un removable spots per day.Provide a
Referring to the lying experiment in Chapter 13. Example 6, the subjects were also able to cheat on the tax form by claiming excessive travel expenses for participating in the experiment. The
Using Appendix B, Table 7, find the upper 10% point of F for (a) d.f. = (3, 5) (b) d.f. = (3, 10) (c) d.f. = (3, 15) (d) d.f. = (3, 30) (e) What effect does increasing the denominator d.f. have?
Identify each of the following as a discrete or continuous random variable. (a) Number of empty seats on a flight from Atlanta to London. (b) Yearly low temperature in your city. (c) The height of
Refer to Exercise 5.9 but let X denote the maximum years experience among the two persons selected.(a) List all choices and the corresponding values of X.(b) List the distinct values of X.(c) Obtain
In the finals of a match play golf tournament, the winner will get $90,000 and the loser $15,000. Find the expected winnings of player B if (a) The two finalists are evenly matched and (b) Player B
The number of overnight emergency calls X to the answering service of a heating and air conditioning firm have the probabilities .05, .1, .15, .35, .20, and .15 for 0, 1, 2, 3, 4, and 5 calls,
Suppose the number of parking tickets X issued during a police officer's shift has the probability distribution(a) Find the mean and standard deviation of the number of parking tickets issued.(b) Let
A botany student is asked to match the popular names of three house plants with their obscure botanical names. Suppose the student never heard of these names and is trying to match by sheer guess.
The number of days, X, that it takes the post office to deliver a letter between City A and City B has the probability distributionx f(x)3...........................54..........................
A roulette wheel has 38 slots, of which 18 are red, 18 black, and 2 green. A gambler will play three times, each time betting $5 on red. The gambler gets $10 if red occurs and loses the bet
Suppose that X can take the values 0, 1, 2, 3, and 4, and the probability distribution of X is incompletely specified by the functionFind (a) f(4) (b) P[X > 2] (c) E(X) and (d) sd(X).
A probability distribution can also be described by a function that gives the accumulated probability at or below each value of X. Specifically,Cumulative distribution function at c = Sum of
Let the random variable Y denote the proportion of times a head occurs in three tosses of a coin, that is, V = (No. of heads in 3 tosses)/3.(a) Obtain the probability distribution V.(b) Draw the
Is the model of Bernoulli trials plausible in each of the following situations? Identify any serious violations of the conditions. (a) A beginning golfer tries 40 putts, 5 feet from the hole, while
Let the random variable X represent the sum of the points in two tosses of a die.(a) List the possible values of X.(b) For each value of X, list the corresponding elementary outcomes.(c) Obtain the
Give an example (different from those appearing in Exercise 5.109) of repeated trials with two possible outcomes where: (a) The model of Bernoulli trials is reasonable. (b) The condition of
If the probability of having a male child is .5, find the probability that the third child is the first son.
A basketball team scores 35% of the times it gets the ball. Find the probability that the first basket occurs on its third possession. (Assume independence.)
The proportion of people having the blood type O in a large southern city is .4. For two randomly selected donors: (a) Find the probability of at least one type O. (b) Find the expected number of
A viral infection is spread by contact with an infected person. Let the probability that a healthy person gets the infection in one contact be p = .4. (a) An infected person has contact with six
The probability that a voter will believe a rumor about a politician is .3. If 20 voters are told individually: (a) Find the probability that none of the 20 believes the rumor. (b) Find the
National safety statistics suggest that about 33% of the persons treated in an emergency room because of moped accidents are under 16 years of age. Suppose you count the number of persons under 16
For each situation, state if a binomial distribution is reasonable for the random variable X. Justify your answer. (a) A multiple-choice examination consists of 10 problems, each of which has 5
A school newspaper claims that 70% of the students support its view on a campus issue. A random sample of 20 students is taken, and 10 students agree with the newspaper. Find P[10 or less agree] if
Examine if the following are legitimate probability distributions.
At one large midwest university, about 40% of the college seniors have a social science major. Fourteen seniors are selected at random. Let X denote the number that have a social science major.
Refer to the population of social science majors in Exercise 5.120 but change the sample size to n = 5. Using the binomial table, (a) List the probability distribution. (b) Plot the probability
For a binomial distribution with p = .15, find the smallest number n such that 1 success is more probable than no successes in n trials.
Only 30% of the people in a large city feel that its mass transit system is adequate. If 20 persons are selected at random, find the probability that 10 or more will feel that the system is adequate.
A sociologist feels that only half of the high school seniors capable of graduating from college go to college. Of 17 high school seniors who have the ability to graduate from college, find the
Jones claims to have extrasensory perception (ESP). In order to test the claim, a psychologist shows Jones five cards that carry different pictures. Then Jones is blindfolded and the psychologist
A manufacturer of luxury cars is experiencing some difficulties with a new metallic paint. During the final check at the end of assembly line, let X = be the number of painting imperfections per car.
A Poisson distribution describes X = the number of bad checks a mega-store receives each day. If this store receives an average of 2 bad checks per day, (a) Find the mean and variance. What are the
Among the library's books purchased in the past three years, 1.2 % cannot be located. A random sample of 150 books is selected from a much larger number purchased in the last three years. Approximate

Showing 66100 - 66200 of 88274

First
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
Last

Services

Sitemap
Fun
Definitions
Become Tutor
Study Help Categories
Recent Questions
Expert Questions

Company Info

Security
Copyrights
Privacy Policy
Terms & Conditions
SolutionInn Fee
Scholarship

Get In Touch

About Us
Contact Us
Career
Jobs
FAQ
Campus Ambassador

Secure Payment

Download Our App

© 2024 SolutionInn. All Rights Reserved