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Forty percent of a particular model of car are silver. What is the probability that in the next 10 observations of this model you observe 5 silver cars?
Y1 & Y2 denotes the proportions of time that employee I and II actually spent working on their assigned tasks during a workday.
In one math class of college there aer 10 males and 20 females. The professor makes 3 student teams to work on a group project.
Airline company officials find that 86% of all people who make reservations show up for their flights.
Explain the difference of your outlook on statistics after having studied it for whatever period of time you have done so as oppose to the time before taking up
In a survey of 125 college students, it was found that of three newspapers, the Wall Street Journal, New York Times, and Chicago Tribune.
In a sample of 1788 of home buyers, you find that 637 home buyers found their real estate agents through a friend.
Poker, in the deck 52 cards, hand of 5 cards, one of the winning hands is flush, all cards belong to a common suit.
An admissions committee must select students for an MBA program. Past data show that 70% of students complete (C) the program.
Company A faces the decision of buying a new flexible manufacturing system or keeping the current system.
Draw a tree diagram that illustrates the following. Three-fifths of kindergarten children are bussed to school, while two-fifths of the first to fifth graders.
In a certain carnival game a player pays $1 and then tosses a fair coin until either a "head" occurs or he has tossed the coin four times.
In a carnival game the players selects two coins from a bag containing two silver dollars and six slugs. Write down the probability distribution.
How is the rejection region defined and how is that related to the z-score and the p value? When do you reject or fail to reject the null hypothesis?
An archer has probability 0.3 of hitting a certain target. What is the probability of hitting the target exactly two times in four attempts?
A personal director in a particular state claims that the mean annual income is greater in one of the state's counties (county A) than it is in another county
An experimental test to detect a particular type of cancer indicates the presence of cancer in 90% of individuals known to have this type of cancer.
Explain the answer, and also prove it algebraically using the definitions of mutually-exclusive and independent events.
The mean tar content of a simple random sample of 25 unfiltered king-size cigarettes is 21.1 mg, with a standard deviation of 3.2 mg
An oil executive has determined that the probability that this oil field contains oil is 0.6. Before starting the drilling she decides.
Let F and M be the number of female and male driver who pass through this toll, respectively. We have N = F + M.
A student of the author surveyed her friends and found that among 20 males, 4 smoke and among 30 female friends, 6 smoke.
Constuct an unique pair of dice (6 sides) so that each of the sums 2 through 12 has an equal (nonzero i.e. cannot have two dice with all zero's).
The proportion of people aged 18-25 who currently use illicit drugs is equal to 0.20 (or 20%). Now, express the null hypothesis H0 and alternative hypothesis
A random sample of size 10 bulbs is selected from the storage room, what is the probability that exactly 4 of the bulbs will have a lifetime less than 16 days?