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Question: Here are winning percentages for 11 baseball players for their best four-year pitching performances:
0.755, 0.721, 0.708, 0.773, 0.782, 0.747, 0.477, 0.817, 0.617, 0.650, 0.651.
a. What is the mean of these scores?
b. What is the median of these scores?
c. Compare the mean and median. Does the difference between them suggest that the data are skewed very much?
Based on the morning voters only, describe the sampling distribution of P^1. Draw a figure similar to given Figure 1.- What is the mean of the sampling distribution of P^1 - P^2?
Show that an asymmetric traveling salesman problem with nodes 1,...,N and arc costs aij can be converted to a symmetric traveling salesman problem involving
What is the relevance of Pearson's r? What does it tell you about the correlation between variables? What is one example of a null hypothesis and the research hypothesis that goes with it?
The final grades for the 5 students from teaching method 2 are 98, 93, 70, 68, 62. Two sample independent t test at alpha of .05 assuming equal variances.
If the campus was equally divided between males and females, what are the probabilities of males and females on this campus would be at risk?
Provide a point estimate of the proportion of selling company's stock which is obsolete. To give a measure of the uncertainty in this estimate, construct a 90% confidence interval for the true proportion of stock which is obsolete.
A survey of 5,250 business travelers worldwide conducted by OAG Business Travel Lifestyle indicated that 91% of business travelers consider legroom.
Assumptions of independence and significance. Wainwright, Leatherdale, and Dublin (2007) evaluated the advantages and disadvantages of using an ANOVA.
an investigation of the effectiveness of a training program to improve customer relationships included a pre-training
1. An observational study is conducted to investigate the association between age and total serum cholesterol. The correlation is estimated at r = 0.35. The study involves n=125 participants and the mean (std dev) age is 44.3 (10.0) years w..
Linear correlation (presented in Session 5) and linear regression are closely related statistical concepts.
For this table, the value of the chi-square statistic is 17.78, and to three decimal places, the corresponding pvalue is .000. Based on these results, state a conclusion about the two variables, and explain why you came to this conclusion.
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