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Two samples of sizes n1 = 20 and n2 = 15 taken from two independent normal populations with known standard deviations, σ1 = 3.5 and σ2 = 4.2, produced sample averages, x¯1 = 15.5 and x¯2 = 13.8. At the α = 0.05 signi?cance level, test the null hypothesis that the means are equal against the alternative that they are not. Interpret the result. Repeat this test for Ha : μ1 > μ2 ; interpret the result.
There are 3 radar stations and the probability of a single radar station detecting an enemy plane is 0.65. What is the probability of 2 stations detecting an enemy plane? Round your answer to nearest hundredth.
Develop two purpose statements - Develop two corresponding research questions for your purpose statements.
1.Why do we care whether the assumptions required for statistical tests are met? (Tip: You might also want to write your answer on a note card you paste to your computer.)
You know that all sociology majors study 2.5 hours per day with a standard deviation of 1.
Based on the above data, find a 95% confidence interval for the average score on the 1st quiz.
Hardluck Harry has a batting average of .200 (i.e., a 20 percent chance of a hit each time he's at bat). Scouts for a rival baseball club secretly observe Harry's performance in 12 random times at bat. What is the probability that Harry will get at l..
The number of cases of merlot wine sold by a Paso Robles winery in an 8-year period follows:
A CFR system with λ = 0.0004 has been operating for 1000 hr. What is the probability that it will fail in the next 100 hr? The next 1000 hr?
For a one tailed hypothesis test (upper tail), the p-value is computed to be 0.034. If the test is being conducted at a 95% confidence, the null hypothesis.
The probability that a randomly selected elementary or secondary school teacher from a city is female is 0.68, holds a second job is 0.38, and is female and holds a second job is 0.29.
Is seat belt use independent of cigarette smoking? A study of seat-belt users and non-users yielded the randomly selected sample data summarized in the table below.
30% student take only Chinese, 30 % student take only Maths. It is found that both male n female has the equal chance to wear spectacles. Draw a tree diagram.
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