Percent of marriages end in divorce
Forty-three percent of marriages end in divorce. You randomly select 15 married couples. Find the probability exactly 5 of the marriages will end in divorce.
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At the 5% level of significance, test that the percentage of defective printed circuit boards is 10% against the alternative that it is greater than 10%. Find the p-value for the test.
An engineer is going to redesign an ejection seat for an airplane. The seat was designed by pilots weighing between 150 lb and 191 lb. The new population of pilots has normally distributed weights with a mean of 157 lb and a standard deviation of 3
The value of the test statistic for testing if one population mean is larger than the other, based on samples of size 24 and 19, is 2.45. What is the p-value for the test? Give your answer to 4 decimal places.
If we want to use mileage, color, and/or condition of the vehicle on a sample of 2009 Chevy Corvette ZR1 cars to predict the price of these vehicles with multiple regression, what can we use as independent variables?
A recent report indicated an average family of four (2 parents and 2 children under the age of 16), spends $500 per month on gasoline. Assume the distribution of gasoline consumption expenditures for a family of four (2 parents and 2 children unde
Find & interpret the probability that exactly 8 of them started smoking before 21 years of age. Find & interpret the probability that fewer than 8 of them started smoking before 21 years of age.
A polling agency wants to determine the size of a random sample needed to estimate the proportion of homeowners who keep a hand gun in their home for security.
Complete the hypothesis for a proportion test. Show all steps Null and alternate hypothesis, diagram, critical value, test statistic. Reject or do not reject conclusion.
California (based on data from SigAlert). This simple random sample was obtained at 3:30 p.m. on a weekday. Use a .05 significance levelto test the claim that the sample is from a population with a mean that is less than the speed limit of 65 MPH.
A USA Snapshot titled: "Are you getting a summer job?" Interviews with high school students produced the following.
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