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Insurance companies are interested in knowing the population percent of drivers who always buckle up before riding in a car.
a. When designing a study to determine this population proportion, what is the minimum number you would need to survey to be 95% confident that the population proportion is estimated to within 0.03?
b. If it was later determined that it was important to be more than 95% confident and a new survey was commissioned, how would that affect the minimum number you would need to survey? Why?
suppose there is a binomial distribution with n 64 and p 0851. what is the mean of the binomial distribution?2. what
Suppose adults have basically distributed IQ scores with a mean of 100 and an SD of 15. Find P65, the 65th percentile. Use the Z table.
High-speed Internet Laying fiber-optic cable is expensive. Cable companies want to make sure that if they extend their lines out to less dense suburban.
What is the name of the statistic used in an ANOVA?- If the independent variable has no effect, the calculated value of F will be around 1.00. Why?
an electrical firm manufactures light bulbs that have a length of life that is approximately normally distributed with
A sample of 4 different calculators is randomly selected from a group containing 42 that are defective and 27 that have no defects. what is the probability that all four of the calculators selected are defective?
The standard deviation in the 12-month earnings per share for 10 companies in the airline industry was 4.27 and the standard deviation in the 12-month earnings per share for 7 companies in the automotive industry was 2.27
a researcher is studying the relationship between earnings for major electronic firms and research and development
let y be a random variable with a density function given byfy 32y2 -1ltylt1fy 0 elsewherefind the density fuction
in a study of pregnant women and their ability to correctly predict the sex of their baby 56 of the pregnant women had
Certain tubes manufactured by a company have a mean life of 800 hours and standard deviation of 60 hours. Find the probability that a random sample of 16 tubes taken from the group will have a mean life of?
Explain how you can tell whether data would best be modeled by an linear model, an exponential model, or neither.
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