We might expect the mean difference (Diesel Unleaded) − in gas prices to be the same for adjacent states. Choose two adjacent states from the data set. Then carry out an appropriate test to see if the data provide convincing evidence to contradict this expectation

The researcher took a random sample of 50 residents and found that the mean height of men is 175cm. Suppose that the team is made aware of the fact that the distribution of heights is distributed normally.  1, The sample median is an unbiased estimate of the mean height of men. Is the following statement about the estimator true?    2, Determine whether or not the median or mean is an efficient estimator of the population median.

Data are collected in an experiment designed to in- vestigate the impact of different positions of the mother during ultrasound on fetal heart rate. Fetal heart rate is measured by ultrasound in beats per minute. The study includes 20 women who are as- signed to one position and have the fetal heart rate measured in that position. Each woman is between 28 weeks and 32 weeks gestation. The data are shown in Table 7–7. Is there a significant difference in mean fetal heart rates by position? Run the test at a 5% level of significance. back        side      sitting        standing 140          141         144            147 144          143        145            145 146          145         147           148 141           144        148            149 139          136        144            145

When the distance from the smallest observation to the 1st quartile is much greater than the distance from the 3rd quartile to the largest observation, the data set is most likely Two answers correct.  1.  symmetrical.   2.  nonsymmetrical.   3.  skewed to the right.   4.  skewed to the left.   5.  not skewed.