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Researchers at Kurume University in Japan surveyed 225 workers aged 41 to 60 years and found that 30% of them were skilled workers and 70% were unskilled. At the time of survey, 15% of skilled workers and 30% of unskilled workers were on an assembly line. A worker is selected at random from the age group 41 to 60.
a. What is the probability that the worker is on an assembly line?
b. Given that the worker is on an assembly line, what is the probability that the worker is unskilled?
In each of the following cases, decide whether or not a binomial distribution is an appropriate model, and give your reasons.
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Use normal approximation to the binomial distribution to determine the answer if this probability cannot be determined explain why.
1. Develop the correlation matrix showing the correlation between all possible pairs of variables. Test statistically to determine which independent variables are significantly correlated with the dependent variable, book sales. Use a significance..
Describe the data appear the strength of the relationship among variables is sufficient to warrant using linear regression forecasting.
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