# Project #29061 - statistics

1. Five hundred draws are made at random with replacement from a box with 10,000 tickets. The average of the box is unknown. However, the average of the draws was 71.3, and their SD was about 2.3. True or false, and explain;

a). the 71.3 estimates the average of the box, but is likely to be off by 0.1 or so

b). A 68% confidence interval for the average of the box is 71.3 +or- 0.1

c). about 68% of the tickets in the box are in the range 71.3 +or- 0.1

2. The NAEP periodically administers tests on different subjects to high school students. in 2000, the grade 12 students in the sample averaged 301 on hte mathematics test; the SD was 30. the likely size if the chance error in the 301 is about                .

a)can you fill in the blank if a cluster sample of 1,000 students was tested? if so what is the answer? if not, why not

b) can you fill in teh blank if a simple random sample of 1.000 students was tested? if so, what is the answer? if not, why not?

 Subject Mathematics Due By (Pacific Time) 04/26/2014 12:00 am
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