Answer questions 8.3.3 and 8.3.4 respectively

8.3.4 .WP An article in Medicine and Science in Sports and

Exercise ["Electrostimulation Training Effects on the Physical Performance of Ice Hockey Players" (2005, Vol. 37, pp.

455-460)] considered the use of electromyostimulation (EMS) as

a method to train healthy skeletal muscle. EMS sessions consisted of 30 contractions (4-second duration, 85 Hz) and were carried

out three times per week for 3 weeks on 17 ice hockey players.

The 10-meter skating performance test showed a standard deviation of 0.09 seconds. Construct a 95% confidence interval of the

standard deviation of the skating performance test.

8.3.3 WP GO Tutorial VS SS An article in Urban Ecosys- tems ["Urbanization and Warming of Phoenix (Arizona, USA): Impacts, Feedbacks and Mitigation" (2002, Vol. 6, pp. 183-203)] mentions that Phoenix is ideal to study the effects of an urban heat island because it has grown from a population of 300,000 to approximately 3 million over the last 50 years, which is a period with a continuous, detailed climate record. The 50-year averages of the mean annual temperatures at eight sites in Phoenix follow. Check the assumption of normality in the population with a prob- ability plot. Construct a 95% confidence interval for the standard deviation over the sites of the mean annual temperatures. Average Mean Site Temperature (C) Sky Harbor Airport 23.3 Phoenix Greenway 21.7 Phoenix Encanto 21.6 Waddell 21.7 Litchfield 21.3 Laveen 20.7 Maricopa 20.9 Harlquahala 20.1