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Assume we want to use a .05 significance level to test the claim that P1<p2. It we want to test that claim by using a confidence interval, what confidence interval should we use? If we test the claim in part a using the sample data in exercise 1, we get this confidence interval: -0.000508<p1-p2<-0.000309. What does this confidence interval suggest about the claim? In general, when dealing with inferences for two population proportions, which two of the following are equivalent: Confidence interval method; P-value method; critical value method?
Historical data suggests a standard deviation in the first sample of 10 and a standard deviation in the second sample of 16. Find a 95% confidence interval for the population difference.
questiona search the internet for the latest figures you can find on the age and sex of the australian population.b
The height of a tree will be measured using a clinometer. For this device, the measurement error has a normal distribution with mean meter and standard deviation . If the tree is exactly 35 meters tall, what is the probability that the clinometer ..
suppose 20 of the people in a city prefer pepsi cola as their soft drink of choice. if a random sample of six people
Assume that correlation coefficient between 2 variables is nearly zero. What does this say about relationship between them?
At the .10 significance level you will test to determine if there has been an increase in selling time. Assuming we are using a t test what will be the critical value"?
Suppose you take a sample of size 100 of test scores and find that the mean is 63. What is the z-score corresponding to this sample mean?
We have administered an anxiety test to all members of the class. The mean anxiety score is 71 and the standard deviation is 9. (higher score=higher anxiety)
Given that Vacationer will travel less than 500 miles, Find out the probability that he/she will drive or take the Bus/Train?
The management of White Industries is considering a new method of assembling its golf cart. The present method requires 42.3 minutes, on the average, to assemble a cart.
Variance of 4.2 and mean of 23.2 were calculated. Find out 95% confidence interval on mean and standard deviation. Describe any potential problems with this analysis.
Confidence Intervals and Chi Square
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