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Let y = wear life of a bearing, x1 = oil viscosity, and x2 = load. Suppose that the multiple regression model relating life to viscosity and load is
a. What is the mean value of life when viscosity is 40 and load is 1100?
b. When viscosity is 30, what is the change in mean life associated with an increase of 1 in load? When viscosity is 40, what is the change in mean life associated with an increase of 1 in load?
(i) state the appropriate null and alternative hypotheses; (ii) determine the appropriate test statistic; (iii) determine the rejection region for a hypothesis test at the
Develop a Venn diagram to illustrate the data, hence use it to find the probability that a worker picked at random: (1) Does not speaker English, (2) Speak neither of the la
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A study was carried out to understand the amount of time put in by the students in three management institutes. One hundred students from different institutions were surveye
Test research hypotheses that there is a difference in level of education between liberals and conservatives, set alpha at .01. Would your decision have been different if alph
A survey of 800 women shoppers found that 17% of them shop on impulse. What is the 98% confidence interval for the true proportion of women shoppers who shop on impulse?
Describe the location of the mean and the median.- Drag the largest observation to the right and back again. How did the mean and median change? Summarize your findings.
A savings account was opened for a baby on 1985 with a $100 deposit. No withdrawals or deposits occurred since the account was opened. The current balance of the account is $2
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