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Last fall, a sample of n = 36 freshman was selected to participate in a new 4-hour training program designed to improve study skills. To evaluate the effectiveness of the new program, the sample was compared with the rest of the freshman class. All freshman must take the same English Language Skills course, and the mean score on the final exam for the entire freshman class was µ = 74. The students in the new program had a mean score of M = 79.4 with a standard deviation of s = 18.
a. On the basis of these data, can the college conclude that the students in the new program performed significantly better than the rest of the freshman class? Use a one-tailed test with α = .05.
b. Can the college conclude that the students in the new program are significantly different than the rest of the freshman class? Use a two-tailed test with α = .05
Assuming we can verify that the data set is approximately normally distributed, what percentage of times will the server be down less than 24 minutes?
Find the standard error of the difference in sample means,
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The quality-control inspector of a production plant will reject a batch of syringes if two or more defective syringes are found in a random sample of eight syringes taken from the batch. Assume the batch contains 1% defective syringes.
In a study designed to test the effectiveness of acupuncture for treating migraine, 142 subjects were treated with acupuncture and 80 subjects were given a sham treatment. The numbers of migraine attacks for the acupuncture treatment group had a m..
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What types of variables are measured using Pearson coefficient, and what types variables are measured with chi square; I am looking for names of variables (e.g., nominal, interval)?
Set up the null and alternative hypotheses, and perform the hypothesis test with a significance level of 0.05.
Explain your answer to someone who is familiar with the t test for a single sample, but not with the t test for independent means.
A physician wanted to estimate the mean length of time µ that a patient had to wait to see him after arriving at the office.
Results of study are summarized below. Use a 5% level of significance and test claim that opinion is independent of brand.
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