To understand the critical nature of sleep to our children's growth and development, we need to understand more about what sleep does, what healthy sleep is, and what happens when children do not get either the right amount of sleep, the best quality sleep, or both.lthough this may seem apparent, many of us actually do not allow our children to get the critical sleep they need to develop and function properly. It's certainly not something we do on purpose. As a matter of fact, we often don't think much of it, and that is the problem.
Sample Mean. The sample mean is the average of all the items in a sample (a group of observations). The following is the formula for the sample mean x of a set {x1, x2, ..., xn} of n observations from a given distribution: The population mean is the average of all the items in a population. Because a population is usually very large or unknown, the population mean is usually an unknown constant. An estimate of the population mean is the sample mean.
For this data set, number of individuals surveyed, n=106. The sample mean is 98.2 o F. The sample standard deviation s=0.62289643. This sample mean is the best point estimate of the population mean. The degrees of freedom is 106-1=105. The sample standard deviation is 0.62289643. The area (0.05) of the distribution in two tails given 105 degrees of freedom gives a critical t value of 1.984.