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Question: A university is concerned that it is taking students too long to complete their requirements and graduate; the average time for all students is 4.7 years. The dean of the campus honors program claims that students who participated in that program in their first year have had a lower mean time to graduation. Unfortunately, there is no automatic way to pull the records of all of the thousands of students who have participated in the program; they must be pulled individually and checked. A random sample of 30 students who had participated is taken, and the mean and standard deviation for the time to completion for those students are 4.5 years and 0.5 year, respectively. Carry out the five steps to test the hypotheses of interest in this situation. Use a = .05.
What is your research question? What is the hypothesized relationship? Using the data for your final project, run a regression with the dependent variable and only the main independent variable of interest. Explain your findings and what it means a..
1. Find the area under the standard normal curve that lies between z = -2.4 and z= 1
A sample histogram indicates that the data are highly skewed to the right. Is this a reliable indication that if all individuals of interest could be measured, the resulting histogram would also be highly skewed?
Suppose X and Y are two random variables with joint PMF that is approximately bivariate normal. Suppose that observing X reduces your prediction standard deviation ofY by a factor of 2.5. What is the correlation between Y and X?
A random sample of 49 employees took a computer literacy test. The sample resulted in a mean score of 75 with a standard deviation of 21. Develop an approximate 95% confidence interval for the population mean of the 600 employees.
The results of the ANOVA carried out were summarized as F(2, 101) = 3.61. Analyze this result and state a conclusion about this study.
testing for population mean.you conduct a survey of a sample of 25 members of this years graduating students and find
Assume that if a women carries the gene for haemophilia, any child has a 50% chance of inheriting that gene, and that is always clear whether or not a son has inherited the gene,
1. a study of commuting times reports the travel times to work of a random sample of 18 employed adults in new york
How large a sample of workers should she take if she wishes to estimate the mean assembly time to within 20 seconds? Assume that the confi- dence level is to be 99%.
Is the transportation model the example of decision making under certainty or decision making under uncertainty? Provide the real-world example illustrtating why it is certainty or uncertainty.
A state lottery involves the random selection of six different numbers between 1 and 28. If you select one six number combination, what is the probability that it will be the winning combination?
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