A common belief among doctors, nurses and other medical professionals is that lunar cycle influences human behavior, such as the quality of sleep. In a recent study, a scientist was interested in investigating whether there is a significant difference in the number of sleeping hours in different moon phases: waxing crescent, full moon, and waning crescent. Participants’ number hour of sleep were recorded in the table below.   Quality of sleeps (in number of hours) Waxing Crescent Full Moon Waning Crescent 7 8 9 7 8 4 5 4 3 6 5 7 8 9 6 What are the groups being compared?  That is, what are the levels of the IV? What is the IV? What is the level of measurement of the IV?

Chapter 2, Section 1, Exercise 010 In this exercise, data from the StudentSurvey dataset is given.Of the 361 students who answered the question about the number of piercings they had in their body, 188 had no piercings, 82 had one or two piercings, and the rest had more than two.Construct a relative frequency table of the data using the categories given.Click here for the dataset associated with this question.Give the relative frequencies rounded to three decimal places. Response Relative Frequency No Piercing   One or two piercings   More than two piercings   Total

QUESTION 6 Find the median for the given sample data. A new business had the following monthly net gains: $8292 $1346 $2275 $7914 $6927 $1610 $2333 $7447 $5102 $5784 Find the median net gain. $4903.00 $5102.00 $5447.78 $5443.00

Background: To prevent crashes caused by running red lights, many states are installing cameras at dangerous intersections. These cameras are used to take photographs of the license plates of vehicles that run a red light. The Virginia Department of Transportation (VDOT) obtained data on the number of crashes per year caused by running a red light at 13 intersections in Fairfax County, Virginia. Source: Virginia Transportation Research Council, "Research Report: The Impact of Red Light Cameras (Photo-Red Enforcement) on Crashes in Virginia", June 2007 Directions: Perform an appropriate significance test to determine whether or not the reduction in the number of crashes was statistically significant. 1. Click on the Data button below to display the data. Copy the data into a statistical software package and click the Data button a second time to hide it. Data Before After 3.7 1.26 0.1 0 4.55 1.69 2.4 1.94 2.09 3.24 2.5 2.72 0.83 0.24 3.05 1.67 3.21 0.33 1.08 0.18 1.25 0.99 7.25 5.02 191…