Interpret calculator display: The following TI-84 Plus calculator display presents a 95% confidence interval for the difference between two means. The sample sizes are n1 = 85 and n2 = 71.

a. Find the point estimate of ????1 − ????2.

b. How many degrees of freedom did the calculator use?

c. Fill in the blanks: We are 95% confident that the difference between the means is between and .

Transcribed Image Text:

2-SampTInt (9.8059,12.998) df=113.2701584 *1=49.81472 x2=38.41269 Sx1=3.69057 Sx2 5.89133 n1=85 n2=71