п»їSECTION A (You should strive all twelve questions)
A2. The sample mean is definitely an neutral estimator for the population indicate. This means: (A) The sample mean constantly equals the population mean.
(B) The average test mean, over-all possible samples, equals the citizenry mean. (C) The test mean is actually very close for the population mean. (D) The sample suggest will only vary a little from your population imply.
A2. The central limit theorem lets us know that the testing distribution of the mean is approximately normal. Which of the next conditions are necessary for the theorem to become valid? (A) The sample size must be large.
(B) We have to be sampling by a normal human population.
(C) The people has to be symmetrical.
(D) The two (A) and (B).
A3. The average monthly mortgage payment for recent home buyers in Mississippi can be Вµ = $732 with standard deviation of sama dengan $421. A random sample of a hundred and twenty-five recent home buyers can be selected. The approximate probability that all their average month-to-month mortgage payment will be more than $782 is ___________. (A) 0. 4082
(B) 0. 4522
(C) 0. 0918
(D) 0. 9082
A4. Which will of the next is not just a point estimation?
A5. An example of 95 items is definitely taken from a population. The normal error can be 839 products. If a sample of five-hundred items had been taken instead, what would have been the standard mistake? (A) 83. 9
(B) 375. a couple of
(C) 167. 8
(D) 20. zero
A6. Within a sample of 400 outlets taken in 2005, it was learned that 136 of those sold rugs at below the list prices which have been recommended by manufacturers. What size sample would have to be taken in order to estimate the percentage to within 0. 02? (Assuming 95% confidence) (A) 2100
A7. Given this hypothesis: H0: Вµ sama dengan 400H1: Вµ в‰ 400 For a arbitrary sample of 12 findings, the test mean was 407 and the standard deviation 6. Making use of the 5% relevance level, compute the value of evaluation statistic. (A) 5. 03
(B) 6th. 23
(C) 4. 04
(D) installment payments on your 98...