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Compute a 95% confidence interval for the population mean, based on the sample 15, 17, 13, 14, 15, 14 and 59. Change the number from 59 to 14 and recalculate the confidence interval. Using the results, describe the effect of an outlier or extreme value on the confidence interval.
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Suppose a researcher conducts a t test for dependent means in which it is predicted that there will be a decrease in unemployment from before to after a particular job-skills training program. The cutoff t needed is -1.833. The standard deviation of the distribution of means of change scores is...
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The most popular car color among 25,000 student at a university.
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Ets divided the colleges into strata but did not perform stratified random sampling. Explain?
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A jar contains 8 orange marbles and 17 black marbles. Two marbles are picked in sequence from the jar. Find the probability that the second marble is black, given that the first marble is orange.
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Write a 700- to 1,050-word paper in APA format explaining your research methods and process for limiting the uncertainty within the decision. Discuss your results in an in-depth narrative
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Suppose a researcher wants to study the effectiveness of a new reading program for students who have not acquired the necessary reading skills by the time they reach the 8th grade. A randomly selected group of 50 students from a local junior high with poor reading skills will undergo a special...
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Instructions for Exercises 12.25 12.27: (a) Use Excel s Tools > Data Analysis > Regression (or MegaStat or MINITAB) to obtain regression estimates. (b) Interpret the 95 percent confidence interval for the slope. Does it contain zero? 12.25 Portfolio Returns (%) on Selected...
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why is the range not the best measure of variation?
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For a random sample of 9 women, the average resting pulse rate is x bar =76 beats per minute, and the sample deviation is s=5. The standard error of the sample mean is:
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- 1. A school administrator wonders if students whose first language is not English score differently on the math portion of the sat exam than students whose first language is English. The mean SAT math score of students whose first language is english is 516 on the basis of data obtained from the college board. A simple random sample of 20 students whose first language is not English result in a sample mean SAT math score of 522. SAT math score are normally distributed with a population standard deviation of 114. Why is it necessary for SAT math scores to be normally distributed to test the hypothesis?
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