Identify which of the 5 sampling techniques is being used. A researcher randomly selects and interviews fifty male and fifty female teachers.

Use the given degree of confidence and sample data to construct a confidence interval for the population proportion p. Of 226 employees selected randomly from one company, 10.62% of them commute by carpooling. Construct a 90% confidence interval for the true percentage of all employees of the company who carpool.

Use the uniform distribution to answer the following questions.   X ~ U ( 0, 30)   Find P(x = 19).    P(x > 17) = (Enter a fraction or a decimal rounded to 2 places.)   Find the 70th percentile. P70 =    

Probability values range between:

Which of the following is not a measure of variation?

Assume that a randomly selected subject is given a bone density test. Those test scores are normally distributed with a mean of 0 and a standard deviation of 1. Find the probability that a given score is greater than 0. The probability is:

Use the confidence level and sample data to find a confidence interval for estimating the population . 33 packages are randomly selected from packages received by a parcel service. The sample has a mean weight of 27.5 pounds and a standard deviation of 3.1 pounds. What is the 95 percent confidence interval for the true mean weight, μ, of all packages received by the parcel service?

The data are the areas of lawns in square feet. You sample five houses. The areas of the lawns are 144.5 sq. feet, 160 sq. feet, 190.5 sq. feet, 180.25 sq. feet, and 210 sq. feet.  What type of data is this?

Binomial ProbabilityAn airline estimates that 92% of people booked on their flights actually show up. If the airline books 75 people on a flight for which the maximum number is 73, what is the probability that the number of people who show up will exceed the capacity of the plane?

students took the SAT exam in 2012. The distribution of scores in the verbal section of the SAT had a mean µ = and a standard deviation σ = . Let X = a SAT exam verbal section score in 2012. Then X ~ N(, ).   Find the z-score for x= . (Round to 2 decimal places as needed.)