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imilar to the addition of SS"s and degrees of freedom in an ANOVA, 2 and degrees of freedom for independent populations can be added together. Asking if any of the populations deviate from our hypothesis of simple dominance. Other questions we might want to ask about pooling similar populations: Do all the subpopulations have the same ratio of yellow to green seeds? Does the average ratio deviate from our hypothesized ratio?
A sample of charge accounts at a local drug store revealed the following frequency distribution of unpaid balances. Determine the standard deviation. Compute the coefficient of variation.
Secondhand smoke is somewhat harmful or very harmful. Is there statistically significant evidence against the representative's claim? Why or why not?
Construct a 95% confidence interval for the proportion and calculate the P value for the given test.
Accident records given by an insurance company give the following information. The probability that an insured driver has an accident is 0.15. If an accident occurs, the damage to the vehicle amount to 20% of its market value 80% of the time
Suppose observations on 50 vehicles yielded a sample mean of 65 mph. Assume that the standard deviation of vehicle speed is known to be 6 mph. Determine the two-sided 99% confidence intervals of the mean speed.
Finds that their mean travel time is = 22.5 minutes. What are the null and alternative hypotheses for testing whether the true mean is different from 20 minutes?
According to a survey 41 % of major US companies electronically monitor their employees. Suppose that 5 such companies are selected independently and at random.
The symbol beside the x should be a straight line, and the less than sign should have a bar under it. I did not know how to key these symbols.
Create the 99% confidence interval on difference of average ages for viewers of the two TV programs. How can you interpret interval?
In how many ways can a committee of 6 members be selected from out of these 12? Find the probability that a random committee contains all males?
Analyze these data and summarize your findings for managers. Explain how information can be used by decision makers. Assume that sales per customer are normally distributed.
Consider an acceptance-sampling scheme in which factory takes delivery of a batch of components if random sample of 400 components contains fewer than M defectives.
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