Chapter 9: Q.52 (page 539)
Draw the general graph of the left-tailed test.
A graph of left-tailed test was represented.
To draw a graph of a left-tailed test
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You flip a coin and record whether it shows heads or tails. You know the probability of getting heads is , but you
think it is less for this particular coin. What type of test would you use?
The mean entry level salary of an employee at a company is . You believe it is higher for IT professionals in the company. State the null and alternative hypotheses.
For Americans using library services, the American Library Association claims that at most of patrons borrow books. The library director in Owensboro, Kentucky feels this is not true, so she asked a local college statistic class to conduct a survey. The class randomly selected patrons and found that borrowed books. Did the class demonstrate that the percentage was higher in Owensboro, KY? Use level of significance. What is the possible proportion of patrons that do borrow books from the Owensboro Library?
Your friend claims that his mean golf score is 63. You want to show that it is higher than that. What type of test would
you use?
According to the N.Y. Times Almanac the mean family size in the U.S. is . A sample of a college math class resulted in the following family sizes:
At level, is the classโ mean family size greater than the national average? Does the Almanac result remain valid? Why?
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