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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 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 .o5. b. Can the college conclude that the students in the new program are significantly different from the rest of the freshman class? Use a two-tailed test with a .O5.
A human society claims that less than 31% of U.S. households own a dog. In a random sample of 392 U.S. households, 155 say they own a dog. At a=0.03, is there enough evidence to support the society's claim?
Five homes are selected at random: What is the probability none of the six selected homes have a security system? (Round your answer to 3 decimal places.)
Here are fifty observations on the weight of tea bags. Calculate the Standard Deviation and Variance.
The p-value for a test statistic is .085, what is the minimum level of significance required to reject the null hypothesis?
The heights were measured for nine supermodels. They have a mean of 67.1 and a standard deviation of 2.3 in. Use the traditional method and a 0.01 significance level to test the claim that supermodels have heights with a mean that is greater than ..
Find out sample correlation coefficients of (I) age with dry weight, and (2) age with log 10 dry weight. Interpret your results.
Develop a linear regression model for these data and forecast carpet sales if 30 construction permits for new homes are filed.
A sample of seed packets was selected, and their weights in grams were recorded as follows: 15.1, 15.6, 15.8, 15.1, 15.5, 15.9, 15.5, 15.2. Determine a 90% confidence interval for the mean weight of seeds in all packets.
Assume the probability that a person has the desease is 0.03 for all people, independently of each other. Compute the total expected number of tests necessary.
If you draw one ball from the urn what is the probability that it is blue or white?
At the .05 level of significance, can we conclude the Middletown students stayed in their districts less time than the Brockton students? Use the five-step hypothesis testing procedure.
For following data, find out whether or not right-hemisphere damage results in significantly decreased performance on spatial skills task.
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