During this time, one looks back to see what he or she has achieved for the past year and also focuses ahead for more to come.
People of different ages and peer groups gather to mark the 18th, 20th, …, birthdays. In the American society, birthdays are one of those days that everyone looks forward to. “To Breakfast or Not to Breakfast?” by Richard Ayore There is sufficient evidence to conclude that the proportion of people in the United States in 2011 who contracted neuroinvasive West Nile disease is more than the proportion of people in the United States in 2010 who contracted neuroinvasive West Nile disease.There is insufficient evidence to conclude that the proportion of people in the United States in 2011 who contracted neuroinvasive West Nile disease is less than the proportion of people in the United States in 2010 who contracted neuroinvasive West Nile disease.There is insufficient evidence to conclude that the proportion of people in the United States in 2011 who contracted neuroinvasive West Nile disease is more than the proportion of people in the United States in 2010 who contracted neuroinvasive West Nile disease.There is sufficient evidence to conclude that the proportion of people in the United States in 2011 who contracted neuroinvasive West Nile disease is less than the proportion of people in the United States in 2010 who contracted neuroinvasive West Nile disease.At a 1% level of significance, the appropriate conclusion is Is the 2011 proportion of neuroinvasive West Nile virus cases more than the 2010 proportion of neuroinvasive West Nile virus cases? Using a 1% level of significance, conduct an appropriate hypothesis test. In the United States in 2010 there were 629 reported cases of neuroinvasive West Nile virus out of a total of 1,021 reported cases and there were 486 neuroinvasive reported cases out of a total of 712 cases reported in 2011. It is spread by the Culex species of mosquito. Neuroinvasive West Nile virus is a severe disease that affects a person’s nervous system. Use the following information to answer the next three exercises. Conclusion: There is sufficient evidence to conclude that the proportions of Hispanic students at Cabrillo College and Lake Tahoe College are different.
The random variable is the difference between the proportions of Hispanic students at Cabrillo College and Lake Tahoe College.Subscripts: 1 = Cabrillo College, 2 = Lake Tahoe College To conduct the test, we use a pooled proportion, p c. Generally, the null hypothesis states that the two proportions are the same. The difference of two proportions follows an approximate normal distribution. A hypothesis test can help determine if a difference in the estimated proportions reflects a difference in the population proportions. If two estimated proportions are different, it may be due to a difference in the populations or it may be due to chance. This keeps each population from being over-sampled and causing incorrect results.Ĭomparing two proportions, like comparing two means, is common. Growing literature states that the population must be at least ten or 20 times the size of the sample.The number of successes is at least five, and the number of failures is at least five, for each of the samples.The two independent samples are simple random samples that are independent.When conducting a hypothesis test that compares two independent population proportions, the following characteristics should be present: Comparing Two Independent Population Proportions