12. In order to find the minimum sample size for the estimátion of population proportion, what do we take as the value of p when we do not have preliminary value for it? a. less than 0.5 b. equal to 0.5 areater than 0.5 d. equal to any desired value

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Chapter10: Statistics
Section10.3: Measures Of Spread
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12. In order to find the minimum sample size for the estimation of
population proportion, what do we take as the value of p when
we do not have preliminary value for it?
b. equal to 0.5
a. less than 0.5
d. equal to any desired value
C. greater than 0.5
13. You want to estimate the mean time Grade 11 students spend
chatting with their Facebook friends each day. The estimate must
be within one minute of the population mean. How many samples
should you take in order to construct a 99% confidence interval
for the population mean. Assume that the population standard
deviation is 3.5 minutes.
a. at least 82
b. exactly 81
C. at most 82
d. exactly 82
14. What is the margin of error for the estimation of the population
mean u when a=0.10, s = 24.5, n 25, and x = 50.3?
a, about 8.33 minutes
b. about 8.35 minutes
C. about 8. 37 minutes
d. about 8.39 minutes
15. What is the critical valuet for the confidence level 1-a 0.99
and n = 27?
a. 2.052
b. 2.056
c. 2.771
d. 2.779
16. You wish to estimate, with 95% confidence, the proportion of
senior high students in your school who read the first book of
Harry Potter. Your estimate must be accurate within 2% of tihe
population proportion. With no preliminary estimate available.
what is the minimum sample size that you need?
a. at least 2,301
b.
at least 2,401
c. at least 2,506
d. at least 2,605
208
Transcribed Image Text:12. In order to find the minimum sample size for the estimation of population proportion, what do we take as the value of p when we do not have preliminary value for it? b. equal to 0.5 a. less than 0.5 d. equal to any desired value C. greater than 0.5 13. You want to estimate the mean time Grade 11 students spend chatting with their Facebook friends each day. The estimate must be within one minute of the population mean. How many samples should you take in order to construct a 99% confidence interval for the population mean. Assume that the population standard deviation is 3.5 minutes. a. at least 82 b. exactly 81 C. at most 82 d. exactly 82 14. What is the margin of error for the estimation of the population mean u when a=0.10, s = 24.5, n 25, and x = 50.3? a, about 8.33 minutes b. about 8.35 minutes C. about 8. 37 minutes d. about 8.39 minutes 15. What is the critical valuet for the confidence level 1-a 0.99 and n = 27? a. 2.052 b. 2.056 c. 2.771 d. 2.779 16. You wish to estimate, with 95% confidence, the proportion of senior high students in your school who read the first book of Harry Potter. Your estimate must be accurate within 2% of tihe population proportion. With no preliminary estimate available. what is the minimum sample size that you need? a. at least 2,301 b. at least 2,401 c. at least 2,506 d. at least 2,605 208
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