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1. Does a low r necessarily mean that there is little "association" between two variables? (Explain.)
2. It is common to find that the correlation between aviation aptitude test scores (X) and pilot proficiency (Y) is higher among aviation cadets than among experienced pilots. How would you explain this?
3. Some studies have found a strong negative correlation between how much parents help their children with homework (X) and student achievement (Y). That is, children who receive more parental help on their homework tend to have lower achievement than kids who receive little or no parental help. Discuss the possible explanations for why these two variables would correlate negatively. Although one cannot infer causality from a correlation, which explanation do you find most persuasive?
4. Consider the situation where there is absolutely 16. no variability in Y.
(a) What would be the standard deviation of Y?
(b) What would be the covariance between X and Y?
(c) What would be the Pearson r? (Don't respond reflexively!)
What is the exam score corresponding to a standard score of -0.73?
What is the probability that a randomly selected automobile manufactured by the company will have a defective microprocessor?
Give a formula for the probability law of the numerical valued random phenomenon described.
Find the probabilities of the like to dance and don't like to sing.- don't like to dance and like to sing.- don't like to dance and don't like to sing.
If all access codes are equally likely, what is the probability that a randomly selected system will have a code with exactly one 0?
True or False? Bivariate correlation coefficient always has same sign as b 1 in Y = b 0 + b 1 X.
Give an example of descriptive statistics in the recorded music industry. Give an example of how inferential statistics could be used in the recorded music.
Test at 1% significance level that there exists a difference in proportion between men and women drivers who always use seat belts.
Of the 250 students in a blind taste test, 150 (60%) preferred Milwaukee's Best over Natural Light. Then the 90% confidence interval for the student population proportion preferring Milwaukee's Best is:
Over the past 50 years, the number of hurricanes that have been reported are as follows: 9 times there were 7 hurricanes, 14 times there were 8 hurricanes, 19 times there were 11 hurricanes, and in the remaining years there were 14 hurricanes. Wha..
Find the probability that a sample of 16 tires will have an average tire life of more than 52000 miles, give that the mean tire life is 50000miles and the standard Deviation is 8489.13.
The following data are numbers of color television sets manufactured per day at a given plant:- Draw a frequency polygon and an ogive for these data.
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