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Last fall, a sample of n=36 freshmen 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 freshmen class. All freshmen 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. 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. 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 α=.05.
Construct the 95 percent confidence interval for the difference between the two population means.
The estimated age-adjusted percent of persons 18 years of age and over who smoke cigarettes are shown below for females and males for selected years.
Suppose that 255 such companies are selected independently and at random. (a) What is the probability that 186 companies in the sample electronically monitor their employees?
Identify the implied population in the information here. Government agencies carefully monitor water quality and its effect on wetlands
Examine the behaviour of 99% critical values for these degrees of freedom, and comment on the limits in this case.
If we assume that the download times are normally distributed, what percent of users will wait between 5 and 10 seconds for the homepage to download?
How could the engineer increase the accuracy of the interval without changing the level of confidence?
What do the results suggest? How might you use this data from this sample size to develop a smoking cessation program at your workplace?
You wish to be 95% confident and have an error of 0.4 mpg. The standard deviation is estimated at 1.8. How big must the sample be?
Use the Empirical Rule to estimate the proportion of costs within two standard deviations of the mean. What are these limits?
The average number of customer complaints at the Full Moon Motel is five per day. Find the probability that on a typical day, the motel will receive
Over the past 30 years in the United States, there has been a strong negative correlation between the number of infant deaths at birth and the number of people over age 65. What lurking variables might be causing the changes in each of the variabl..
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