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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).
While in July the mean high temperature is 74oF and the standard deviation is 8oF. In which month is it more unusual to have a day with a high temperature of 55oF?
Carbon monoxide (CO) emissions for a certain kind of car vary mean 2.4 g/mi and standard deviation 0.7g/mi. A company has 60 of these cars in its fleet. Let y represent the mean CO level for the companies fleet. Estimate the probability that y is ..
You read that statistical test at α=0.01 level has probability 0.14 of making a Type II error when specific alternative is true. Calculate the power of test against this alternative?
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The mean score of a college entrance test is 500, the standard deviation is 75 and the scores are normally distributed.
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A test of hypothesis is conducted at the .05 level of significance to test either or not the population correlation is zero.
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