Last year a sample of us adults showed that 14% went shopping on Thanksgiving Day this...
Last year a sample of us adults showed that 14% went shopping on Thanksgiving Day this year a group wants to make a 90% confidence interval of all US adults that are going shopping this year the group wants the margin of error to be 3% a what is the minimum sample size required to obtain this type of accuracy use the prior year's the ample proportion in your calculation
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Last year a sample of us adults showed that 14% went
shopping on Thanksgiving Day this...
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...
Pinworm: In a prior sample of U.S. adults, the Center for Disease Control (CDC), found that...
Pinworm: In a prior sample of U.S. adults, the Center for Disease Control (CDC), found that 10% of the people in this sample had pinworm but the margin of error for the population estimate was too large. They want an estimate that is in error by no more than 2.5 percentage points at the 90% confidence level. Enter your answers as whole numbers. (a) What is the minimum sample size required to obtain this type of accuracy? Use the prior...
In a prior sample of corn, farmer Carl finds that 16% of the sample has worms...
In a prior sample of corn, farmer Carl finds that 16% of the sample has worms but the margin of error for his population estimate was too large. He wants an estimate that is in error by no more than 1.5 percentage points at the 90% confidence level. (a) What is the minimum sample size required to obtain this type of accuracy? Use his prior sample proportion in your calculation. The minimum sample size is ____ ears of corn. (b)...
Corn: In a prior sample of corn, farmer Carl finds that 16% of the sample has...
Corn: In a prior sample of corn, farmer Carl finds that 16% of the sample has worms but the margin of error for his population estimate was too large. He wants an estimate that is in error by no more than 2.5 percentage points at the 95% confidence level. Enter your answers as whole numbers. (a) What is the minimum sample size required to obtain this type of accuracy? Use his prior sample proportion in your calculation. The minimum sample...
A random sample of 915 adults showed that 34% of them are smokers. Based on this...
A random sample of 915 adults showed that 34% of them are smokers. Based on this sample, the 90% confidence interval for the proportion of all adults who are smokers, rounded to four decimal places, is: the lower endpoint is i the upper endpoint is
In a recent poll of 1 adults current debt during the next three months. A more...
In a recent poll of 1 adults current debt during the next three months. A more detailed poll surveyed 1288 adult groups, 18-29, 30-49, 50-64, and 65+. Complete parts a and b below ) Do you expect the 95% confidence interval for the true proportion of all 18-to 29-year-olds who are wormed to be wider or narrower than the 95% c for the true proportion of all consumers? Explain Choose the correct answer below O A The interval for the...
A poll taken this year asked 1009 adults whether they were fans of a particular sport...
A poll taken this year asked 1009 adults whether they were fans of a particular sport and 55% said they were. Last year, 56% of a similar-size sample had reported being fans of the sport. a) Find the margin of error for the poll taken this year if one wants 90% confidence in the estimate of the percentage of adults who are fans of the sport. b) If one wanted to be 85% confident instead of 90% confident, would the...
Fair Coin? In a series of 100 tosses of a token, the proportion of heads was...
Fair Coin? In a series of 100 tosses of a token, the proportion of heads was found to be 0.58. However, the margin of error for the estimate on the proportion of heads in all tosses was too big. Suppose you want an estimate that is in error by no more than 0.05 at the 95% confidence level. (a) What is the minimum number of tosses required to obtain this type of accuracy? Use the prior sample proportion in your...
1. A random sample of 82 customers, who visited a department store, spent an average of...
1. A random sample of 82 customers, who visited a department store, spent an average of $71 at this store. Suppose the standard deviation of expenditures at this store is O = $19. What is the e 98% confidence interval for the population mean? 2. A sample of 25 elements produced a mean of 123.4 and a standard deviation of 18.32 Assuming that the population has a normal distribution, what is the 90% confidence interval for the population mean? 3....
Find the minimum sample size required to estimate a population proportion with a margin of error...
Find the minimum sample size required to estimate a population proportion with a margin of error equal to .04 and a confidence level of 90%. A recent study resulted in a sample proportion of .70. ALSO determine the minimum sample size if no prior study was done.
A random sample of 915 adults showed that 34% of them are smokers. Based on this sample, the 90% confidence interval for the proportion of all adults who are smokers, rounded to four decimal places, is: the lower endpoint is i the upper endpoint is
In a recent poll of 1 adults current debt during the next three months. A more detailed poll surveyed 1288 adult groups, 18-29, 30-49, 50-64, and 65+. Complete parts a and b below ) Do you expect the 95% confidence interval for the true proportion of all 18-to 29-year-olds who are wormed to be wider or narrower than the 95% c for the true proportion of all consumers? Explain Choose the correct answer below O A The interval for the...
1. A random sample of 82 customers, who visited a department store, spent an average of $71 at this store. Suppose the standard deviation of expenditures at this store is O = $19. What is the e 98% confidence interval for the population mean? 2. A sample of 25 elements produced a mean of 123.4 and a standard deviation of 18.32 Assuming that the population has a normal distribution, what is the 90% confidence interval for the population mean? 3....
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