## Distribution of sample means Test

Unit Test #75

Select your answers to the following 5 questions from the pop-up menus in the right hand column. Clicking the "Begin Test Again" button will clear all the answers.

 Q1: A population has a mean of 85 kg and a standard deviation of 9 kg. If samples of size 36 are taken, what is the expected value of the sample means? A. 9 kgB. 81 kgC. 85 kgD. 9.2 kg Answer 1: A                    B                    C                    D Q2: From the population in question 1, what is the standard error of the distribution of sample means? A. 1.5 kgB. 0.25 kgC. 9 kgD. 3 kg Answer 2: A                    B                    C                    D Q3: If 1000 samples of size 36 were taken from the above population, what shape would the frequency curve of the distribution of sample means be? A. triangularB. rectangularC. bimodalD. normal Answer 3: A                    B                    C                    D Q4: The mean number of rooms in each house of a city is 8 with a standard deviation of 2.5. A statistician doing a survey wants to take samples so that the standard deviation of the sample means is 0.08. What should the sample size be? A. 977B. 31C. 640D. 20 Answer 4: A                    B                    C                    D Q5: In question 4, what would be the expected value of the distribution of sample means? A. 64B. 8C. 6.25D. 16 Answer 5: A                    B                    C                    D