A researcher who she’s to estimate within $2 the average repair cost for a refrigerator.  if she wishes to be 95% confident how large of a sample would be necessary if the population standard deviation is $15.25?

Please explain. In a survey, 11 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $41 and standard deviation of $4. Find the margin of error at a 90% confidence level.Give your answer to two decimal places.

Consider the following data: −10, −10, 0, 3, −10, 3, 3  Step 1 of 3: Calculate the value of the sample Variance. Round your answer to one decimal place. Step 2 of 3: Calculate the value of the sample deviation. Round your answer to one decimal place. Step 3 of 3: Calculate the value of the range.

An economist wants to estimate the mean per capita income (in thousands of dollars) for a major city in California. He believes that mean income is $23.7, standard deviation $9.1. How large of a sample would be required in order to estimate the mean per capita income at 98% level of confidence with an error of at most $0.44? Round answer up to next integer

An economist wants to estimate the mean per capita income (in thousands of dollars) for a major city in Texas. He believes that the mean income is $20.8$, and the standard deviation is known to be $⁢9.9. How large of a sample would be required in order to estimate the mean per capita income at the 99% level of confidence with an error of at most $⁢0.62? Round your answer up to the next integer.

You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately o = 47.6. You would like to be 98% confident that your estimate is within 1.5 of the true population mean. How large of a sample size is required? Round up to nearest whole number. n = Question Help: Video Written Example Message instructor Submit Question Jump to Answer LockDown Browser P Type here to search

Directions: Solve the following. Show your complete solution. Fifty randomly selected jeepneys were stopped, and the tread depth of their right front tires were measured. The mean was 0.32 inch and the standard deviation was 0.08 inch. Find the 99% confidence interval of the mean depth. Assume that the variable is approximately normally distributed.

You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately 79.8. You would like to be 95% confident that your estimate is within 5 of the true population mean. How large of a sample size is required?

One year, the distribution of salaries for professional sports players had mean $1.9 million and standard deviation $0.8 million. Suppose a sample of 100 major league players was taken. Find the 85th percentile of the sample mean or average salary of 100 major league players. Round to two decimal places.     $2.73 million     $1.91 million     $1.98 million     $2.31 million

You know the mean and standard deviation of the population. You take a sample from this population and compute the 90% confidence interval for the mean. This interval contains values that are within how many standard deviations of the mean?