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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 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 .05
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 .05.
Afterward, each mouse is given a hyperactivity rating score. The mean score was x_bar = 14.9 and s = 2.8. Give a 95% confidence interval for the population mean score μ.
A clinical trial was conducted comparing a new compound designed to improve wound healing in trauma patients to a placebo. After treatment for 5 days, 58% of the patients taking the new compound had a substantial reduction in the size of their wou..
How many Kleenex should the kimberly Clark Corporation package of tissues contain? Researchers determined that 60 tissues is the average number of tissues used during a cold.
Which of the examples below represent the Ratio level of scaling?
The heights in inches of 18 randomly selected adult males in LA are listed as: 70, 69, 72, 57, 70, 66, 69, 73, 80, 68, 71, 68, 72, 67, 58, 74, 81, 72. Display the data in a stem-and-leaf plot.
What happens to the Maximum Error of Estimate as the sample size gets larger?
Cumulative frequency distribution, histogram, ogive and stem and leaf display. Calculate appropriate summary statistics. Incorporate these graphs and statistics into a well written summary
At 95% confidence using the critical value approach, determine if the proportion of females in the company is significantly less than 50%.
Whether the suitable analysis would be one-tailed test or two-tailed test. A type I and type II error, given context of hypothesis.
What is the upper limit of the 95% interval? Give your answer to three decimal places. Which of the following assumptions should be checked before constructing the above confidence interval?
What can you say with 95% confidence about the percent of all American adults who think that humans developed from earlier species of animals.
How do we use a least squares regression line? What is the range for the coefficient of determination?
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