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What is the probability that a randomly selected family owns both a dog and a cat? What is the conditional probability that a randomly selected family owns a dog given that it doesn't own a cat?
A certain brand of candies have a mean weight of 0.8617 g and a stand deviation of 0.0521, based on a sample of a package containing 442 candies. The package label stated that the net weight is 377.
Which of the following is a valid objective function for a linear programming problem?
A battery manufacturer claims that the lifetime of certain type of battery is normal with population mean of 50 hours and a standard deviation of 4 hours.. Let X( has bar on on top) be the mean life
Use the following problem to determine the binding constraints for the optimal solution. MAX P = 30X + 40Y
When alternate optimal solutions exist in an LP problem, then The problem will also be unbounded
Sums and Linear combinations of normal random variables are also normally distuributed. Suppose W, X and Y are independent normal random variables.
A linear program has been solved and sensitivity analysis has been performed. The ranges for the objective function coefficients have been found. For the profit on X, the upper bound is 80, the lowe
A machine produces 1000 rubber 0=rings per hour. Each ring has a .9 probability of meeting a thickness specification.
If we have no information about the proportion of votes that either candidate received, determine the sample size necessary to be 95% confident that the error will be within 4 percentage points.
A light fixture contains 2 light bulbs. The lifetime Xi of each bulb is exponentially distributed with a mean of 200 hours, i= 1,2,3. Suppose bulb lifetimes are independent from one another. Let T e
A light fixture contains 2 light bulbs. The lifetime Xi of each bulb is exponentially distributed with a mean of 200 hours, i= 1,2,3. Suppose bulb lifetimes are independent from one another. Let T
Suppose X is a normal random variable with expected value 7 and standard deviation 3. Then calculate the following porbabilities.
What is the critical value of z in the previous question? Report the critical value CLOSEST to your calculated z-score. (Answer to 2 decimal places.)
The average age of doctors in a certain hospital is 49.0 years old. suppose the distribution of ages is normal and has a standard deviation of 8.0 years. if 9 doctors are chosen at random for a comm
The corner convenient shop sells two flavored cookies: strawberry and vanilla. Data show that 23% customers buy strawberry flavored cookies and the rest buys vanilla flavored cookies. You may have m
Assume that the given procedure yields a binomial distribution with n trials and the probability of success for one trail is p. Use the given values of n and p to find the mean and the standard devi
The lengths of sardines received by a certain cannery have a mean of 4.54 in and a standard deviation of 0.25 in. What percent of the sardines are less than 4.00 in?
What is the best point of est of the population mean net change ldl cholesterol after the garlic treatmemnt. Construct a 95% confidence internal est of the mean net change
Using a 0.05 level of significance, test the hypothesis that the probability of the NCAA Division I basketball champion being from the Pac 10 is 20%. Repeat the test for the hypothesis that the prob
Suppose we have far more variables than observations, so that K>N. We can include at most N-1 variables, at which point the R2 is 1. That suggests that we must select at most N-2 variables, if no
The data in the Excel spreadsheet linked below indicate the selling prices of houses located on corner lots ("corner-lot houses") and of houses not located on corner lots.
Over the years grades in an introductory statistics course were recorded and showed the following proportions: