Question

Refer to the accompanying data display that results from a sample of airport data speeds in Mbps. Complete parts​ (a) through​ (c) below. Click the icon to view a t distribution table. TInterval ​(13.046,22.15) x over bar equals17.598 Sx equals16.01712719 n equals 50 a. What is the number of degrees of freedom that should be used for finding the critical value t Subscript alpha divided by 2​? df equals nothing ​(Type a whole​ number.) b. Find the critical value t Subscript alpha divided by 2 corresponding to a​ 95% confidence level. t Subscript alpha divided by 2 equals nothing ​(Round to two decimal places as​ needed.) c. Give a brief general description of the number of degrees of freedom. A. The number of degrees of freedom for a collection of sample data is the total number of sample values. B. The number of degrees of freedom for a collection of sample data is the number of sample values that can vary after certain restrictions have been imposed on all data values. C. The number of degrees of freedom for a collection of sample data is the number of​ unique, non-repeated sample values. D. The number of degrees of freedom for a collection of sample data is the number of sample values that are determined after certain restrictions have been imposed on all data values. Click to select your answer(s).

Answer 1

a. What is the number of degrees of freedom that should be used for finding the critical value t Subscript alpha divided by 2​?

DF = n-1 = 50-1 = 49

b. Find the critical value

c. Give a brief general description of the number of degrees of freedom.

B. The number of degrees of freedom for a collection of sample data is the number of sample values that can vary after certain restrictions have been imposed on all data values.