Chapter 11: Q.69 (page 658)
Decide whether the following statements are true or false:
As the number of degrees of freedom increases, the graph of the chi-square distribution looks more and more symmetrical.
The given statement is true.
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Transit Railroads is interested in the relationship between travel distance and the ticket class purchased. A random sample of passengers is taken. Table 11.31 shows the results. The railroad wants to know if a passengerโs choice in ticket class is independent of the distance they must travel.
State the hypothesis:
:
:
Some travel agents claim that honeymoon hot spots vary according to the age of the bride. Suppose that recent brides were interviewed as to where they spent their honeymoons. The information is given in Table . Conduct a test of independence
| Location | and over | |||
| Niagara Falls | ||||
| Poconos | ||||
| Europe | ||||
| Virgin Islands |
The marital status distribution of the U.S. male population, ages and older, is as shown in Table 11.35.
| Martial Status | Percent | Frequency |
| never married | 31.3 | |
| married | 56.1 | |
| widowed | 2.5 | |
| divorced /separated | 10.1 |
What are the null and alternative hypotheses for a math teacher who sees if two of her classes have the same distribution of test scores.
Suppose an airline claims that its flights are consistently on time with an average delay of at most minutes. It claims that the average delay is so consistent that the variance is no more than minutes. Doubting the consistency part of the claim, a disgruntled traveler calculates the delays for his next flights. The average delay for those flights is minutes with a standard deviation of minutes.
If an additional test were done on the claim of the average delay, but 45 flights were surveyed, which distribution would you use?
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