according to the HOMEWORKLIB RULES l have done first question in multiple questions. Please asked other questions separately.
Question 10 14 pts Suppose X is a random variable with mean 100 and standard deviation...
Help with question 10 please and thank you. Question 10 14 pts Suppose X is a random variable with mean 100 and standard deviation 15. Suppose that we select random samples of size n = 81 to construct a sampling distribution of means. Then which of the following is NOT true? O The standard deviation of the sampling distribution is 15/9 The mean of the sampling distribution is 100 Given enough samples, the shape of the sampling distribution will be...
8 pts Question 11 A climate scientist wishes to estimate the mean temperature in Jakarta, Indonesia. The scientist selects a random sample of 30 days, and records the temperature reported for each day, the mean of the sample is 91.3°F, and the sample standard deviation is s = 6.6°F Use this data to construct a 90% confidence interval for the true mean temperature. (88.253, 94.347) (89.253, 93.347) (90253,95.347) (86.253.95.347)
Question 14 8 pts A laboratory tested a sample of 100 chicken eggs and found that the mean amount of cholesterol was 257 milligrams; the population standard deviation for alleggs is 15.2 milligrams. Use this data to construct a 95 percent confidence interval for the true mean cholesterol content of all such eggs. (251.02.262.981 1255.02.261.981 1249.02, 264.98) (254.02, 259.98) Question 15 8 pts A group of 19 randomly selected students from a state university has a mean age of 224...
A variable of a population has a mean of μ=100 and a standard deviation of σ=35. a. The sampling distribution of the sample mean for samples of size 49 is approximately normally distributed with mean________ and standard deviation_______?
7. The standard deviation of the mean for the sampling distribution of random samples of size n-36 from a large (or infinite) population is 2. How large must the sample size be to decrease the standard deviation to 1.2?
11. If the standard deviation of the mean for the sampling distribution of random samples of size 36 from a large or infinite population is 2, how large must the sample size become if the standard deviation is to be reduced to 1.2? Show work. (8 points)
Scores on the SAT mathematics section have a normal distribution with mean 4-500 and standard deviation o=100. a. What proportion of students score above a 550 on the SAT mathematics section? Round your answer to 4 decimal places. b. Suppose that you choose a simple random sample of 16 students who took the SAT mathematics section and find the sample mean x of their scores. Which of the following best describes what you would expect? The sample mean will be...
Suppose X is a normal random variable with mean = 100 and standard deviation = 20. What is the Z-value for X= 90? a) 0.5 b) -0.5 c) 5 d) -5
For each of the following, find the mean and standard deviation of the sampling distribution of the sample mean. State if the sampling distribution is normal, approximately normal, or unknown. a. The population is skewed right with a mean of 4 and a standard deviation of 6. Many samples of size 100 are taken. b. The population is normal with a mean of 61 and a standard deviation of 9. Many samples of size 900 are taken. c. The population...
If the standard deviation of the mean for the sampling distribution of random samples of size 49 from a large or Infinite population is become if the standard deviation is to be reduced to 5257 how large must the sample size Gradebook Sear The sample se must become see score Enter your answer in the answer box to search