Problem 14
In a city, \(70 \%\) of the people prefer Candidate A. Suppose 30 people from this city were sampled. a. What is the mean of the sampling distribution of \(\mathrm{p}\) ? b. What is the standard error of \(\mathrm{p} ?\) c. What is the probability that \(80 \%\) or more of this sample will prefer Candidate \(\mathrm{A}\) ?
Problem 16
In the population, the mean SAT score is 1000 . Would you be more likely (or equally likely) to get a sample mean of 1200 if you randomly sampled 10 students or if you randomly sampled 30 students? Explain.
Problem 17
True/false: The standard error of the mean is smaller when \(\mathrm{N}=20\) than when \(\mathrm{N}\) \(=10\)
Problem 18
True/false: The sampling distribution of \(\mathrm{r}=.8\) becomes normal as \(\mathrm{N}\) increases.
Problem 20
True/false: In your school, \(40 \%\) of students watch TV at night. You randomly ask 5 students every day if they watch TV at night. Every day, you would find that 2 of the 5 do watch TV at night.
Problem 21
True/false: The median has a sampling distribution.
