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Chapter 8: Q. 29 (page 522)
Latoya wants to estimate the proportion of the seniors at her boarding school who like the cafeteria food. She interviews an SRS of of the seniors and finds that think the cafeteria food is good.
The sample size condition does not meet.
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Catching goldfish for schoolCarly and Maysem plan to be preschool teachers after they graduate from college. To prepare for snack time, they want to know the mean number of goldfish crackers in a bag of original-flavored goldfish. To estimate this value, they randomly selected bags of original-flavored goldfish and counted the number of crackers in each bag. Here are their data:
Construct and interpret a confidence interval for the true mean number of crackers in a bag of original- flavored goldfish.
Reporting cheating What proportion of students are willing to report cheating by other students? A student project put this question to an SRS of undergraduates at a large university: “You witness two students cheating on a quiz. Do you go to the professor?”
t time When constructing confidence intervals for a population mean, we almost always use critical values from a t distribution rather than the standard Normal distribution.
a. When is it necessary to use a t critical value rather than a z critical value when constructing a confidence interval for a population means?
b. For a particular level of confidence, explain what happens to the t critical values as Page Number: 548 the degrees of freedom increase.
You have measured the systolic blood pressure of an SRS of company employees. A confidence interval for the mean systolic blood pressure for the employees of this company is . Which of the following statements is true?
a. of the sample of employees have a systolic blood pressure between 122 and .
b. of the population of employees have a systolic blood pressure between and.
c. If the procedure were repeated many times, of the resulting confidence intervals would contain the population mean systolic blood pressure.
d. If the procedure were repeated many times, of the time the population mean systolic blood pressure would be between and .
e. If the procedure were repeated many times, of the time the sample mean systolic blood pressure would be between .
Election polling Gloria Chavez and Ronald Flynn are the candidates for mayor in a large city. We want to estimate the proportion p of all registered voters in the city who plan to vote for Chavez with confidence and a margin of error no greater than . How large a random sample do we need?
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