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1. Sometimes newspapers sample opinions of the local population by printing a "ballot" and asking readers to mark it and mail it in. Evaluate this sampling technique.
2. Consider as a population the students at State U. whose names are listed alphabetically in the student directory. Are the following samples biased or random?a. Every fifth name on the list
b. Every member of the junior class
c. 150 names drawn from a box that contains all the names in the directory
d. One name chosen at random from the directory
e. A random sample from those taking the required English course.
Construct a 95% CI for the proportion of households with family history of heart disease, separately for each race. Would you say the proportion of households with history of heart disease differ by race?
If active redundancy is the only means of achieving further reliability growth for each of the subsystems, what is the minimum number of redundant units of each necessary to achieve the component reliability goals?
a company manufactures a batteries in batches of 20 and there is a 3 rate of defects find the mean and standard
What is the approximate distribution of the mean NOX emission level x for these cars? (b) What is the level L such that the probability that x is greater than L is only 0.01?
At a party n men take off their hats. The hats are then mixed up and each man randomly selects one. We say that a match occurs if a man selects his own hat. What is the probability of no matches? What is the probability of exactly k matches?
Key Refining decided to send a special financing plan to charge account customers having the highest 10 percent of the money charges. What is the dividing point between customers who receive the special plan and those who do not.
in the design of an electromechanical product 12 components are to be stacked into a cylindrical casing in a manner
When performing a 2-way ANOVA with replication you must first: A) Perform an interaction hypothesis test B) Take out the error because you ran replicates and error makes no sense with replicates
The following data are the lifetimes (in hours) of 20 certain electrical components: Find a point estimate and 90% confidence interval for the population lower quartile.
Suppose we have the following data: From a normally distributed population we take a sample of size 25, the mean of the sample is 2.2 and the sample standard deviation is 0.42.
a simple random sample of 100 postal employees is used to test if the average time postal employees have worked for the
suppose we select an srs of size n 100 from a large population having proportion p of successes. let x be the number
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