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A die has half of the faces red and the other half black. The die is rolled 3 times. Let the random variable X represent the number of black outcomes out of three rolls. What is P(1) that is the pro
Consider the experiment of rolling a pair of dice. Suppose that we are interested in the sum of the face values showing on the dice.
Within what range would approximately 95% of the waiting times lie if we were sampling a normal distribution? Do you think the distribution is likely to be normal? Explain.
A psychologist, Dr. Bill Mikalek, administered a test of manual dexterity to 30 third-graders. The times, in minutes, required to complete the test are given below. Construct a frequency distributio
If the diameters are distributed normally with mean μ=0.251 and standard deviation σ=0.001, what percentage of them are within specifications?
The probability that an individual has 20-20 vision is 0.15. in a class of 50 students, what is the mean and standard deviation of the number with 20-20 vision in the class?
Scores on a standard test are normally, distributed with a mean of 104 and a standard deviation of 15. An individual's test score is found to be 112. Find the z-score corresponding to this value.
From 8 names on a ballot, a committee of will be elected to attend a political national convention. how many different committees are possible?
Suppose a sample of 40 major league platers was taken. find the approximate probability that the average salary of the 400 players exceeded $1.1 million.
Explain whether you would retain or reject the Null Hypothesis that your sample comes from a population whose mean is 100. Use the alpha = .05 criterion.
With any statistical model, we assess the fit. Does the model accurately depict the truth? Explain how standard deviation helps to assess the "Fitness" of the mean.
Eleven chairs are numbered 1 through 11. Four girls and seven boys sit on these chairs at random. What is the probability that chair 5 is occupied by a boy?
A random sample of size 100 is taken from an infinite population having the mean μ=76 and the standard deviation σ=16. What is the probability of getting an x bar between 75 and 78?
What is the probability that exactly two customers arrive in the two hour period of time between 2:00pm and 4:00 pm (one continuous two hour period)?
The number of cracks in a section of interstate highway that are significant enough to require repair. What is the probability that at least one crack requires repair in 1/2 mile of high.
The number of cracks in a section of interstate highway that are significant enough to require repair is assumed to follow a Poisson distribution with a mean of two cracks per mile.
What are the main difference between the frequency distribution of continuous data and discrete data.
When you arrive in your new Chevrolet , there are already 7 cars in the lot. What is the probability that you can find two adjacent unoccupied spaces for your Chevrolet?
Explain the concepts of reliability and validity. Why are they important to research and statistics? How do we measure each of these? What happens if the questionnaire we use is determined to not be
Use the multiplication rule of counting to determine the number of different choices the sales representative has for the order in which to visit the cities.
SCCoast, an Internet provider, developed the following frequency distribution on the age of Internet users. Find the mean, median, and the standard deviation.
In correlation and regression we are examining relationships between two or more variables (i.e., ad spending and sales).
A drawer is picked at random and a ball chosen at random from the two balls in the drawer. Given that a gold ball was drawn, what is the probability that the drawer with the two gold balls was chose
What are the mean earnings of males and females in this sample? Does the regression result support the claim in the news?
How many seats must a train have to assure a probability of .99 or better of having a seat for each passenger?