If you decrease the sample size, the width of confidence interval
will
| A.be the same. | |
| B.increase. | |
| C.decrease | |
| D.depends on the population size |
Suppose a population consisted of 300 patients. How big the sample
size should be to have a maximum sampling error of 10%, if
population is normally distributed?
A.30 Patients |
|
B.270 Patients |
|
C.90 patients |
|
D.Can’t be determined. |
John claims that about 85 percent of students of California schools
experience difficulty with socializing and getting a sense of
belonging. Stacy wants to test this claim, so she randomly samples
60 students and finds that 45 have experienced difficulty. Test
John’s claim at the 95% level of confidence.
A.Yes. John’s claim is valid. |
|
B.No. John’s claim is not valid. |
|
C.Both a and b are correct, depending on the total number of students of California schools. |
|
D.None of the above. |
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