A survey is commissioned to study the weight of NFL players at certain positions. Of the 188 active NFL running backs, a simple random sample of size 16 is selected and the sample mean is determined to be x = 219.3 pounds. It is known that the standard deviation is a = 6.8 pounds. Compute a 99% confidence interval for u. 223.664 219.3 1.091 219.33.332 219.34.379

Given two independent random samples with the following results: n₂ = 8 x₂ = 124 $2 = 28 = 16 n₁ x₁ = 94 $1 = 16 Use this data to find the 90 % confidence interval for the true difference between the population means. Assume that the population variances are equal and that the two populations are normally distributed. Copy Data Step 1 of 3: Find the point estimate that should be used in constructing the confidence interval.

A car company developed a certain car model to appeal to young consumers. The car company claims the average age of drivers of this certain car model is 26.00 years old. Suppose a random sample of 17 drivers was drawn, and the average age of the drivers was found to be 28.90 years. Assume the standard deviation for the age of the car drivers to be 2 years. Complete parts a through c below. a. Construct a 95% confidence interval to estimate the average age of the car driver. The 95% confidence interval for the average age of the car driver has a lower limit of years old and an upper limit of years old. (Round to two decimal places as needed.) b. Does this result lend support to the car company's claim? A. No, because the interval does not include the company's claimed average age. B. Yes, because the interval includes the company's claimed average age. C. Yes, because the interval does not include the company's claimed average age. D. No, because the interval includes the company's…

A single burger contains a mean of 100 g of cooked beef with a standard deviation of 5 g. The restaurant owner claims that new triple burger contains three times as much beef. The table shows a sample of masses from 30 triple burgers. Does the sample support the claim at a 95% confidence level? Triple Burger Beef Mass (g) 292 297 295 290 290 294 291 296 282 291 289 291 290 292 295 289 289 294 298 292 294 295 285 297 296 287 302 289 290 290

Construct a  90%  confidence interval for the population mean,  μ . Assume the population has a normal distribution. A sample of  15  randomly selected students has a grade point average of  2.81  with a standard deviation of  0.63 .

Consider evidence from a random sample of 10 cars of the same model. The average gas mileage from this sample is 27 mpg. Assume that the gas mileage for all cars of this model is Normally distributed with a standard deviation of 5 mpg. Calculate a 95% confidence interval for the mean. Group of answer choices 23.84 to 30.16 17.20 to 36.80 23.90 to 30.10 26.02 to 27.98

An economist found that a random sample of 45 high school teachers had an average annual salary of $58,230.  A previous study showed that the population standard deviation is $4450. Calculate the margin of error, E, for a 90% confidence interval for µ, the average annual salary of all high school teachers. A. $1488.6  B. $1300.2  C. $1652.1  D.$1091.2

A researcher believes that the mean of a population is 45.2. She collects data from a sample (n = 81) and finds that the sample mean is 40.4, with a standard deviation of 19. Construct a 90% confidence interval to determine whether 45.2 is a reasonable hypothesis about the value of mu.

Suppose a randomly selected sample of n = 69 men has a mean foot length of x = 27.9 cm, and the standard deviation of the sample is 3 cm. Calculate an approximate 95% confidence interval for the mean foot length of men. (Round the answers to one decimal place.)