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1. In the x2 test, why is it that only the area in the upper tail of the χ2 distribution is of interest?
2. Suppose it is known in a large urban school district that four out of five teenagers who join a gang subsequently drop out of high school. A "stay in school" intervention is instituted for a sample of 45 gang members. It is later found that 30 of these students have remained in school and 15 dropped out. Is the intervention effective?
(a) Give H0 and H1 in terms of the proportion of gang members who drop out of high school.
(b) Compute χ2 and perform the test at α = 05.
(c) Draw final conclusions.
The probability is 0.03 that a passenger on United Airlines Flight 9841 is a Platinum flyer (50,000 miles per year).
Find the probability that when this car breaks down, it takes at most 30 minutes to fix it.
If you were an auditor and observed more than 30% with improper documentation, what would you conclude about the firms claim that only 20% suffered from improper documentation and why?
Estimate the interquartile range of the cholesterol levels.- Above what value are the highest 15% of women's cholesterol levels?
Provide a 95% interval estimate of the real occupancy rate with an average room rate of $90.
create a game of chance using a coin dice or a standard deck of cards. choose how to play the game and determine at
Obesity and exercise. The Centers for Disease Control and Prevention (CDC) has estimated that 19.8% of Americans over 15 years old are obese.
Determine if sequence Sn converges in distribution. -Determine if sequence Sn converges in probability.- Determine if sequence Sn converges in the MS sense.
Assuming that the data is normally distributed and the sample size is greater than 30, calculate the critical values for a two tailed and a one-tailed test when alpha = 0.05
the data show the bug chirps per minute at different temperatures. find the regression equation letting the first
Just as it is a mistake for marketers to consider the U.S. population a homogeneous group with the same values and culture, it is also a mistake for marketers to assume that all Hispanic consumers fit into the same subculture or have similar buyin..
A pharmaceutical company claims that four out of five doctors prescribe the pain medicine it produces.
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