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Do students who learned english as well as another language simultaneously score worse on the SAT critical reading exam than the general population of test takers? The mean score among all test takes on the SAT critical reading exam 501. A random sample of 100 test takers who learned enlish as well as another language simultaneously had a mean SAT critical reading score of 485 with a standard deviation of 116. Do these results suggest that students who learn english as well as anther language simultaneously score worse on the SAT critical reading exam?
a). State the appropiate null and alternative hypothesis.
b). Verify that the requirements to perform the test using the t-distribution are satisfied.
c). Use the classical or P-value approach at the confidence level = 0.1 level of significance to test the hypothesis in part (a).
d). Write a conclusion based on the results in part (c).
Annual family dental expenses for the families of a random sample of ten employees of a company are given below. You can assume the family dental expenses for the employees of the company are normally distributed.
When performing a 2-way ANOVA with replication you must first: A) Perform an interaction hypothesis test B) Take out the error because you ran replicates and error makes no sense with replicates
Determine the relationships among data above? Analyze with charts/graphs/tables and a discussion.
Experience has shown that radon gas level is approximately normally distributed for this population.
Median can be a more suitable measure of central tendency than mean if distribution of data is extremely skewed.
Calculate a 95 percent confidence interval for the population mean audit delay for all public owner-controlled companies in New Zealand.
Finding the Equation of the Regression Line and Making Predictions. Find the regression equation,
If writing scores for population have standard deviation of σ = 20, does sample give adequate evidence to conclude that new composition course has significant effect?
Here is a simple probability model for multiple-choice tests. Assume that each student has probability p of correctly answering the question chosen at random from universe of possible questions.
15% were contaminated with salmonella, and 13% were contaminated with both of these bacteria. What is the probability that a tested chicken chosen at random is: contaminated with salmonella and not campylobacter.
In a 1993 survey of 560 college students, 171 said that they used illegal drugs during the previous year. In a recent survey of 720 college students, 263 said that they used illegal drugs during previous year.
the employees of a firm that does asbestos cleanup are being tested for indications of asbestos in their lungs. the
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