Calculations Note: It is best to keep all percentages in whole numbers in your equations (i.e....
Calculations Note: It is best to keep all percentages in whole numbers in your equations (i.e. 50% = 50 and not .50, or 6% = 6, not .06). This will insure you keep them consistent and avoid large errors.
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Calculate the sampling error (accuracy) at a 95% confidence level for a study where the sample size is 800 and the estimated proportion (p) you are estimating is that 35% of the people will buy your product
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Calculate the sampling error (accuracy) at a 95% confidence level for a study where the sample size is 1200 and the estimated proportion (p) you are estimating is that 55% of the people will buy your product
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Calculate the sample size needed to achieve an acceptable error rate of plus or minus 6% at a 95% Confidence Level and an estimated proportion of 40% who are aware of your product.
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Calculate the sample size needed to achieve an acceptable error rate of plus or minus 2% at a 95% Confidence Level and an estimated proportion of 40% who are aware of your product.
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Calculations Note: It is best to keep all percentages in
whole numbers in your equations (i.e....
What advertising medium gives a brand the most credibility in influencing brand decisions? According to a...
What advertising medium gives a brand the most credibility in influencing brand decisions? According to a survey, 37% of Millennials point to TV. Complete parts (a) through e) a. To conduct a follow-up study that would provide 95% confidence that he point estimate is correct to within t 5 of th population propor how easample i es required A sample size of people is required. Round up to the nearest integer.) b To conduct a follow-up study that would provide...
help with stat: A software developer wants to re-do the survey in #1 with the goal...
help with stat: A software developer wants to re-do the survey in #1 with the goal of estimating the proportion of NKU students who carry an iPhone using a 95% confidence interval. The developer wants her estimate to be within ± 3% of the true proportion. Calculate the minimum sample size she must gather to achieve that level of accuracy. Show work for partial credit.
In a prior sample of us adults the center for disease control found that 10% of...
In a prior sample of us adults the center for disease control found that 10% of the people in this sample had pin worms but the margin of error for the population estimate was too large. They want the margin of error to be 2% at the 95% confidence level. a) what is the minimum sample size required to obtain this type of accuracy? Use the prior sample proportion in your calculation b) what is the minimum sample size required...
Hours after a governor was indicted on several counts of fraud and extortion, two reputable research...
Hours after a governor was indicted on several counts of fraud and extortion, two reputable research firms polled citizens from the region asking whether they thought the governor should resign. The first poll revealed that 60% people in the region felt the governor should resign; it had a margin of error of plus or minus 4.8 percentage points. The other poll reported that 55% people in the region felt the governor should resign; it had a margin of error of...
You have been given the task of organizing a poll regarding an upcoming election. The object...
You have been given the task of organizing a poll regarding an upcoming election. The object is to estimate the proportion of the country that will vote to keep the current government in power. You have been told to collect a sample and find a 95% confidence interval for the proportion. This interval is allowed to have a margin of error of 4%. A preliminary investigation suggests that the proportion of people that will vote to keep the current government...
5. A manufacturing company produces electric insulators. To test the strength of the insulators, you apply a force...
5. A manufacturing company produces electric insulators. To test the strength of the insulators, you apply a force to an insulator until it breaks. You measure the force by observing! how many pounds are required to break the insulator. You collect the force data for a random sample of 30 insulators selected for this experiment. The data is in the Excel file for this assignment in the tab Force. a. Construct a 95% confidence interval estimate for the population mean...
On a certain day, Gallup reported that of the 1,008 people surveyed, 71% of U.S. workers...
On a certain day, Gallup reported that of the 1,008 people surveyed, 71% of U.S. workers believe that they will continue working past retirement age. The confidence level for this study was reported at 95% with a +3% margin of error. Part (a) Determine the estimated proportion from the sample. (Enter your answer to two decimal places.) 0.71 Part (b) Determine the sample size. (Enter your answer as a whole number.) 1008 @ Part (c) Identify CL and a. (Enter...
The Census Bureau groups data on households into census tracts, where each census tract has a total population of about 4,000 residents. Census tracts should be divided so that the households in the c...
The Census Bureau groups data on households into census tracts,
where each census tract has a total population of about 4,000
residents. Census tracts should be divided so that the households
in the census tracts share certain characteristics, such as
economic status. Even though most tracts are around 4,000
residents, there is some variability, which is the focus of this
lab. In practice, census tracts usually have a population between
1,200 and 8,000 people.
I just need help with the...
11 of 13 ID: MST.CI.RSS.03.0020 [2 points] You have been given the task of organizing a...
11 of 13 ID: MST.CI.RSS.03.0020 [2 points] You have been given the task of organizing a poll regarding an upcoming election. The object is to estimate the proportion of the country that will vote to keep the current government in power. You have been told to collect a sample and find a 95% confidence interval for the proportion. This interval is allowed to have a margin of error of 3%. A preliminary investigation suggests that the proportion of people that...
A company with a large fleet of cars wants to study the gasoline usage. They check...
A company with a large fleet of cars wants to study the gasoline usage. They check the gasoline usage for 50 company trips chosen at random, finding a mean of 25.02 mpg. Based on the past experience, they believe the standard deviation of the general gasoline usage is 4.83 mpg. Which kind of confidence intervals is appropriate to use here, z-interval or t-interval? Please use R to find the critical value they need when constructing a 95% CI. Please. Use...
What advertising medium gives a brand the most credibility in influencing brand decisions? According to a survey, 37% of Millennials point to TV. Complete parts (a) through e) a. To conduct a follow-up study that would provide 95% confidence that he point estimate is correct to within t 5 of th population propor how easample i es required A sample size of people is required. Round up to the nearest integer.) b To conduct a follow-up study that would provide...
Hours after a governor was indicted on several counts of fraud and extortion, two reputable research firms polled citizens from the region asking whether they thought the governor should resign. The first poll revealed that 60% people in the region felt the governor should resign; it had a margin of error of plus or minus 4.8 percentage points. The other poll reported that 55% people in the region felt the governor should resign; it had a margin of error of...
You have been given the task of organizing a poll regarding an upcoming election. The object is to estimate the proportion of the country that will vote to keep the current government in power. You have been told to collect a sample and find a 95% confidence interval for the proportion. This interval is allowed to have a margin of error of 4%. A preliminary investigation suggests that the proportion of people that will vote to keep the current government...
5. A manufacturing company produces electric insulators. To test the strength of the insulators, you apply a force to an insulator until it breaks. You measure the force by observing! how many pounds are required to break the insulator. You collect the force data for a random sample of 30 insulators selected for this experiment. The data is in the Excel file for this assignment in the tab Force. a. Construct a 95% confidence interval estimate for the population mean...
On a certain day, Gallup reported that of the 1,008 people surveyed, 71% of U.S. workers believe that they will continue working past retirement age. The confidence level for this study was reported at 95% with a +3% margin of error. Part (a) Determine the estimated proportion from the sample. (Enter your answer to two decimal places.) 0.71 Part (b) Determine the sample size. (Enter your answer as a whole number.) 1008 @ Part (c) Identify CL and a. (Enter...
The Census Bureau groups data on households into census tracts,
where each census tract has a total population of about 4,000
residents. Census tracts should be divided so that the households
in the census tracts share certain characteristics, such as
economic status. Even though most tracts are around 4,000
residents, there is some variability, which is the focus of this
lab. In practice, census tracts usually have a population between
1,200 and 8,000 people.
I just need help with the...
11 of 13 ID: MST.CI.RSS.03.0020 [2 points] You have been given the task of organizing a poll regarding an upcoming election. The object is to estimate the proportion of the country that will vote to keep the current government in power. You have been told to collect a sample and find a 95% confidence interval for the proportion. This interval is allowed to have a margin of error of 3%. A preliminary investigation suggests that the proportion of people that...
A company with a large fleet of cars wants to study the gasoline usage. They check the gasoline usage for 50 company trips chosen at random, finding a mean of 25.02 mpg. Based on the past experience, they believe the standard deviation of the general gasoline usage is 4.83 mpg. Which kind of confidence intervals is appropriate to use here, z-interval or t-interval? Please use R to find the critical value they need when constructing a 95% CI. Please. Use...
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