If the is 53 based on past research and you want to

4. If the  is 5.3, based on past research, and you want to construct a 97% C.I., what’s your point
estimate of  ?
A. 61.17
B. 30
C. 5.4
D. .968
E. 65
5. If the  is 5.3, based on past research, and you want to construct a 97% C.I., what’s your value for
*
z ?

6. If the  is 5.3, based on past research, and you want to construct a 97% C.I., what’s your
x

value?
7. If the  is 5.3, based on past research, and you want to construct a 97% C.I., what’s the margin of
error?
8. Based on past research, you know  is 5.3. What is the 97% confidence interval for the population
mean?
A. (59.07, 63.27)
B. (60.20, 62.14)
C. (65, 69.4)
D. (40,60)
E. (60,65)
9. A teacher administers a standardized math test to his class of 75 students. The mean score (out of
300 possible points) is 235. From previous studies, you know the population standard deviation is
28. Using the sample data given, calculate a 95% confidence interval for the population mean.
10. A teacher administers a standardized math test to a random sample of students. From previous
studies, you know the population standard deviation is 28. The principal has decided that she
wants to estimate the average score to within 4 points with 99% confidence. How large should the
sample be to achieve the desired margin of error and confidence level?
11. You compute a 99% C.I. with sample of size M and a margin of error of + or – 5 units. You now wish
to compute a 90% C.I. with the same margin of error with a sample of size P. For this situation,
which of the following is true?