Based on this sample, plausible values of u, the true mean annual cosmic radiation exposure for all flight crew members, are between 3.001 and 3.139 mSv. One mSv is the avera that the mean annual exposure of flight crew members is somewhere between about 3 and 3.14 times greater than for the general population. A 95% confidence level is associated Which of the following is not required for using the method described above if sample size n is large? O that the sample is random that the population standard deviation a is known that the sample mean x is known O that the population has normal distribution Find a 90% confidence interval for . (Round your answers to three decimal places.)

Find the value of tal2 and n = 25 for the %3D 90% confidence interval for the mean if the population standard deviation, ơ, is not known.

Based on a sample of size 49, a 95% confidence interval for the mean scaore of all students, u, on an aptitude is from 59.2 to 64.8. Find the margin of error.

A confidence interval for (μ1−μ2) is (-5, 8). Which of the following inferences is correct? Question 8 options: no significant difference between means μ1=μ2 μ1>μ2 μ1

please give answer to 5 decimal places. image attached.

Suppose that the population of lengths of all fully grown male killer whales is approximately normally distributed. A recent article published in the Zoology Now journal claims that the mean of this population is 6.99 m. You want to test the claim made in the article, so you select a random sample of 10 fully grown male killer whales and record the length of each. Follow the steps below to construct a 90% confidence interval for the population mean of all lengths of fully grown male killer whales. Then state whether the confidence interval you construct contradicts the article's claim. (If necessary, consult a list of formulas.) (a) Click on "Take Sample" to see the results for your random sample. (b) Take Sample Point estimate: 0 Sample standard deviation: 0 Critical value: 0 Compute Enter the values of the sample size, the point estimate of the mean, the sample standard deviation, and the critical value you need for your 90% confidence interval. (Choose the correct critical value…

A sample of marine iguanas (n=30) from the Galapagos Islands has an average length of 2.8ft with a sample variance of 0.43ft. What is the 95% confidence interval of this sample?

The concentration of an additive in a standard sample of gasoline was measured 5 times with the following results: 0.13, 0.11, 0.12, 0.20, and 0.14 % by mass.Calculate the arithmetic average (mean) and standard deviation of the data.Calculate the 95% confidence interval.If the accepted value for the standard sample is 0.11 % by mass, are the results for this set of measurements be significantly different at the 95% confidence level by the t test.Can any of the data be rejected by the Q test?

A study found that a 95% confidence interval for the mean μ of a particular population was computed from a random sample of 1200 people and found it to be 10 ± 4. Therefore, we may conclude:

A random sample of 78 measurements was selected from a population with ?=2.76σ=2.76. The sample mean was 122.5. Calculate a 99% confidence interval for ?