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An instructor in a large lecture class found at the end of the semester that total points scored by students in his class was approximately normal with mean 530 and standard deviation 80. About wha
Compute the probability of a successful operation (i.e., an operation in which at least one hit is a success) if all 3 missiles are launched and a hit within 40 miles of the target is considered a s
In an inventory study it was determined that on average demands for a particular item at a warehouse were made four times per day. What is the probability that on a given day an item is requested
use an appropriate test to determine if the reason for component failures is independent of their designs. Show your manual calculations here.
The quality control manager at a light bulb factory needs to estimate the average life of a large shipment of light bulbs. A random sample of 64 light bulbs indicated a sample average life of 300 ho
A sample of 4 different calculators is randomly selected from a group containing 17 that are defective and 36 that have no defects. What is the probability that at least one of the calculators is d
An IRS auditor randomly selects 3 tax returns from 58 returns of which 8 contain errors. What is the probability that she selects none of those containing errors?
A researcher used stepwise regression to create regression models to predict BirthRate (births per 1,000) using five predictors: LifeExp (life expectancy in years), InfMort (infant mortality rate),
You are a travel agent and wish to estimate, with 98% confidence, the proportion of vacationers who use an online service or the internet to make travel reservations. Your estimate must be accurate
Assuming the manufacturer's claim is correct, what is the probability the mean of the sample is 12.22 ounces or more?
Determine the minimum sample size he must select if he wants to be 90% confident that the true average time is within 10 minutes of the sample average?
Using the given data set, find (a) the sample mean, (b) the sample standard deviation, (c) construct a 98% confidence interval for the population mean μ. Assume the data set is normally distribut
These data represent the ages of drivers and the number of accidents reported for each age group in Pennsylvania for a selected year. (Age, Number of Accidents) (16, 6605), (17, 8932), (18, 8506),
Assume that the mean systolic blood pressure of normal adults is 120 millimeters of mercury and the standard deviation is 5.6. Assume the variable is normally distributed. If an individual is selec
Under what conditions should you use the ÷2 (chi-square) test to determine whether there is a difference between proportions of two independent populations?
What probability model is most nearly appropriate to describe the number of burned out fluorescent tubes in a classroom with 12 fluorescent tubes, assuming a constant probability of a burned out tu
These data represent the ages of drivers and the number of accidents reported for each age group in Pennsylvania for a selected year. (Age, Number of Accidents) (16, 6605), (17, 8932), (18, 8506), (
what is the minimum number of employees that should be sampled by the Exxon corporation if it wishes to estimate the true mean number of years to retirement of its employees to within one month of t
Your friends Jim and Jennifer are considering signing a lease for an apartment in this residential neighborhood. They are trying to decide between two apartments, one with 1,000 square feet with a
A previous study of nickels showed that the population standard deviation of the weight of nickels is 150 milligrams. A coin counter manufacturer wishes to find the 90% confidence interval for the a
the most famous geyser in the world is, old faithful in yellowstone national park, has a mean time between eruptions of 85 minutes. If the interval between eruptions is normally ditributed with a st
A company normally distributed with a mean of 12.4% and a standard deviation of 20.6%, consider drawing a random sample of n=5 stocks from the population of all stocks and calculating the mean retur