Question
In: Statistics and Probability
You are running a political campaign and wish to estimate, with 90% confidence the population proportion...
You are running a political campaign and wish to estimate, with 90% confidence the population proportion of voters who will vote for your candidate. Your estimate must be within 5% of the population proportion. Find the minimum sample size if:
a. no preliminary estimate for p is given.
b. A preliminary estimate for p-hat is 62%.
Please show all work or if you used a TI 84 please explain the necessary steps to get the answer, thank you for the help :)
Solutions
Expert Solution
|
Refer Standard normal table/Z-table or use excel function "=NORM.S.INV((1-0.05))" to find the Z-value.
|
Round the value to the nearest integer.
--------------------------------------------------------------------------------------------
Round the value to the nearest integer.
orchestra answered 1 year agoRelated Solutions
You are running a political campaign and wish to estimate, with 95% confidence, the proportion of...
You are running a political campaign and wish to estimate, with
95% confidence, the proportion of registered voters who will vote
for your candidate. Your estimate must be accurate within 3% of the
true population. Find the minimum sample size needed if
1) No preliminary estimate is available
2) Preliminary estimate gives p (hat) = 0.31
3) Compare your results
you are a travel agent and wish to estimate with 90% confidence in the proportion of...
you are a travel agent and wish to estimate with 90%
confidence in the proportion of vacationers who use an online
service or the internet to make travel reservations.
your estimate must be accurate to within 3% of the population
proportion
a. find the minimum sample size needed to perform this
estimation if you do not use any prior estimates for the sample
proportion.
b.find the minimum sample size needed to perform this
estimation if you assume that a prior...
A researcher wishes to estimate, with 90% confidence, the population proportion of adults who think the...
A researcher wishes to estimate, with 90% confidence, the
population proportion of adults who think the president of their
country can control the price of gasoline. Her estimate must be
accurate within 4% of the true proportion. a) No preliminary
estimate is available. Find the minimum sample size needed. b)
Find the minimum sample size needed, using a prior study that
found that 32% of the respondents said they think their president
can control the price of gasoline. c) Compare...
A)Assume that a sample is used to estimate a population proportion p. Find the 90% confidence...
A)Assume that a sample is used to estimate a population
proportion p. Find the 90% confidence interval for a sample of size
157 with 54 successes. Enter your answer as an open-interval (i.e.,
parentheses) using decimals (not percents) accurate to three
decimal places. C.I. =
B) Assume that a sample is used to estimate a population
proportion p. Find the 99.9% confidence interval for a
sample of size 142 with 65 successes. Enter your answer as a
tri-linear inequality using...
A researcher wishes to estimate, with 90% confidence, the population proportion of adults who are confident...
A researcher wishes to estimate, with 90% confidence, the
population proportion of adults who are confident with their
country's banking system. His estimate must be accurate within 4%
of the population proportion. (a) No preliminary estimate is
available. Find the minimum sample size needed. (b) Find the
minimum sample size needed, using a prior study that found that
32% of the respondents said they are confident with their
country's banking system. (c) Compare the results from parts (a)
and (b).
Assume that a sample is used to estimate a population proportion p. Find the 90% confidence...
Assume that a sample is used to estimate a population proportion
p. Find the 90% confidence interval for a sample of size
379 with 299 successes. Enter your answer as a tri-linear
inequality using decimals (not percents) accurate to three decimal
places.
Assume that a sample is used to estimate a population proportion p. Find the 90% confidence...
Assume that a sample is used to estimate a population proportion
p. Find the 90% confidence interval for a sample of size 395 with
267 successes. Enter your answer as an open-interval (i.e.,
parentheses) using decimals (not percents) accurate to three
decimal places. C.I. =
Assume that a sample is used to estimate a population proportion
p. Find the 99% confidence interval for a sample of size
155 with 36% successes. Enter your answer as an
open-interval (i.e., parentheses) using...
Assume that a sample is used to estimate a population proportion p. Find the 90% confidence...
Assume that a sample is used to estimate a population proportion
p. Find the 90% confidence interval for a sample of size 99 with 38
successes. Enter your answer as an open-interval (i.e.,
parentheses) using decimals (not percents) accurate to three
decimal places.
90% C.I. =
Answer should be obtained without any preliminary rounding.
However, the critical value may be rounded to 3 decimal places.
A researcher wishes to estimate, with 90% confidence, the population proportion of adults who are confident...
A researcher wishes to estimate, with 90% confidence, the
population proportion of adults who are confident with their
country's banking system. His estimate must be accurate within 5%
of the population proportion. (a) No preliminary estimate is
available. Find the minimum sample size needed. (b) Find the
minimum sample size needed, using a prior study that found that
25% of the respondents said they are confident with their
country's banking system. (c) Compare the results from parts (a)
and (b)....
You are a travel agent and wish to estimate, with 98% confidence, the proportion of vacationers...
You are a travel agent and wish to estimate, with 98%
confidence, the proportion of vacationers who use an online service
or the Internet to make reservations for lodging. Your estimate
must be accurate by 4% of the population proportion. (Please show
your work)
a.) If no preliminary estimate is available, find the minimum
sample size needed.
b.) Find the minimum sample size needed, using a prior study
that found that 10% of the respondents said they used an online...
ADVERTISEMENT
ADVERTISEMENT
Latest Questions
- You have been asked to prepare a December cash budget for Ashton Company, a distributor of...
- Holly bought a 7-year bond, with a 3% coupon paid semi annually. It was priced to...
- METAR Abbreviations METAR (Meteorological Aviation Report) is a format for reporting weather information, either for pilots...
- The data below are the heights of fathers and sons (inches). There are 8 rows in...
- Without quantization procedure how much of actual information is lost during analog to digital conversion process??...
- 11. Suppose that a 32M × 16 memory built using 512K × 8 RAM chips and...
- Write a C++ program that asks the user to enter in three numbers and displays the...
ADVERTISEMENT