Sally and Sara sell flower pots at their garage sale. Sally motivates Sara mentioning that they will sell a minimum of 15 pots per day if the outside temperature exceeds 60o F. From a sample, whose population is assumed to follow a Normal Distribution, taken for 30 days at 60 degrees or more an average of 13.6 pots per day were sold with a Standard Deviation of 0.7 pots. The statistical Degrees of Freedom for this example are?
The degrees of freedom in a statistical sample is calculated as the sample size minus one (n - 1). Given that there were 30 observations in the sample, we calculate the degrees of freedom as 30 - 1, which equals 29.
B is correct. The sample was collected for 30 days, in other words, there are 30 observations in this one sample. These 30 observations were taken whenever the temperature was 60 or plus, this probably was not possible in 30 consecutive days because the temperature is likely not to stay constant for 30 days. The sample size is 30 observations and degree of freedom is = Sample Size - 1, which is 30 - 1 = 29.