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A survey of 31 accountants shows the average salary is $65,000 with a population std deviation...
Suppose the population standard deviation is believed to be $812 and the salaries are normally distributed....
Suppose the population standard deviation is believed to be $812 and the salaries are normally distributed. Find the sample size needed to construct a 98% confidence interval to estimate the average salary of accountants, within +/- $200.
A survey of 170 commuters shows that on average people travel 17.4 km with standard deviation...
A survey of 170 commuters shows that on average people travel 17.4 km with standard deviation 8.4 km. Find 99% confidence interval for the population mean commuting distance. State your conclusion. Show work
a) 25 CEOs in the healthcare industry are polled. The average salary with stock bonuses for...
a) 25 CEOs in the healthcare industry are polled. The average salary with stock bonuses for the poll is $282,000 with a sample std. dev. of $71,000. What is the 95% confidence interval for the population mean of CEOs salary with stock bonuses for the healthcare industry? b) 25 CEOs in the healthcare industry are polled. The average salary with stock bonuses for the poll is $282,000 with a sample std. dev. of $71,000. It is known that in 1990,...
33 46 48 21 30 32 10 31 20 29 A survey of 25 randomly selected...
33 46 48 21 30 32 10 31 20 29 A survey of 25 randomly selected customers found the ages shown (in years). The mean is 31.76 years and the standard deviation is 10.37 years. a) Construct a 98 % confidence interval for the mean age of all customers, assuming that the assumptions and conditions for the confidence 20 38 40 35 40 interval have been met. 22 37 10 41 26 b) How large is the margin of error?...
9. A group of statistics students decided to conduct a survey at their university to find...
9. A group of statistics students decided to conduct a survey at their university to find the average (mean) amount of time students spent studying per week. Assuming a population standard deviation of three hours, what is the required sample size if the error should be less than a half hour with a 99% level of confidence? 10.University officials say that at least 70% of the voting student population supports a fee increase. If the 95% confidence interval estimating the...
In 2009, the average starting salary for an individual right out of college with a bachelor’s...
In 2009, the average starting salary for an individual right out of college with a bachelor’s degree in business was $51,620 per year. Suppose a 2014 study, which randomly sampled 74 individuals right out of college with a bachelor’s degree in business, showed an average starting salary of $49,400. Assume the population standard deviation is $8,710. Does the 2014 study indicate that the average starting salary of an individual right out of college with a bachelor’s degree in business is...
13. A random sample is drawn from a population of known standard deviation 11.3. Construct a...
13. A random sample is drawn from a population of known standard deviation 11.3. Construct a 90% confidence interval for the population mean based on the information given (not all of the information given need be used). a. n-36, x =105.2, s=11.2 b. n-100, x =105.2, s - 11.2 14. A random sample is drawn from a population of unknown standard deviation. Construct a 99%99% confidence interval for the population mean based on the information given. a. n=49, x 17.1,...
Construct a 98% confidence interval for the population standard deviation σ of a random sample of...
Construct a 98% confidence interval for the population standard deviation σ of a random sample of 20 crates which have a mean weight of 154.2 pounds and a standard deviation of 9.4 pounds. Assume the population is normally distributed. The confidence interval is: Group of answer choices between 6.52 and 15.02 between 6.81 and 14.83 between 42.51 and 225.60 between 46.39 and 219.94
A random sample of 51 college students shows that they spend, on average, 4.5 hours on...
A random sample of 51 college students shows that they spend, on average, 4.5 hours on video games every night, with a standard deviation of 1.25 hours. Construct a 98% confidence interval to estimate the mean number of hours that college students spend on video games every nigh
A random sample of 28 customers at a gas station shows an average gas purchase of...
A random sample of 28 customers at a gas station shows an average gas purchase of 8.9 gallons with a standard deviation of 3.2 gallons. Find the 98% confidence interval estimating the population mean number of gallons purchased at this station. Interpret this result.
33 46 48 21 30 32 10 31 20 29 A survey of 25 randomly selected customers found the ages shown (in years). The mean is 31.76 years and the standard deviation is 10.37 years. a) Construct a 98 % confidence interval for the mean age of all customers, assuming that the assumptions and conditions for the confidence 20 38 40 35 40 interval have been met. 22 37 10 41 26 b) How large is the margin of error?...
13. A random sample is drawn from a population of known standard deviation 11.3. Construct a 90% confidence interval for the population mean based on the information given (not all of the information given need be used). a. n-36, x =105.2, s=11.2 b. n-100, x =105.2, s - 11.2 14. A random sample is drawn from a population of unknown standard deviation. Construct a 99%99% confidence interval for the population mean based on the information given. a. n=49, x 17.1,...
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