worn, poorly set-up machine is observed to produce components whose length X follows a normal distribution with mean 14 centimeters and variance 9. Calculate the probability that a component is at least 12 centimeters long. Round your

Suppose the variance of X is 14. What is the variance of .47X?

Given that age of ECU students is normally distributed. A random sample of 16 students had an average age of 25 years and a variance of 4 square years. The 98% CI for the true average age of all ECU students is?

Assume the probability that a maple tree at age 10 grows less than 110 cm is equal to 0.4. If the height of maple trees at age 10 are estimated to be normally distributed with mean u cm and variance 100 cm. find u.

The mean square error is the variance plus the bias. True O False

The director of research and development is testing a new drug. She wants to know if there is evidence at the 0.02 level that the drug stays in the system for more than 312 minutes. For a sample of 69 patients, the mean time the drug stayed in the system was 319 minutes. Assume the variance is known to be 400. Step 2 of 5 :   Enter the value of the z test statistic. Round your answer to two decimal places.

STATISTICS.docx - Google Docs + A docs.google.com/document/d/1Xgqq34HC4kub_OY7HprnxliVKF2wTIZI/edit 2. One wishes to estimate the average age of a student population. It is known that the standard deviation is 2 years. A sample of 50 students is taken and the mean of these students is 23.2 years. What is the point estimate of the population mean? b. Find a 95% confidence interval for the pop. mean. а. 3:26 AM P Type here to search W 36°F Mostly clear * 4) 12/15/2021