Question

1. 	New	Current
   Sample Size	7	7
   Sample Mean	518.2857	561.7143
   Sample Standard Deviation	38.9774	27.5058
   df
   Pooled Sample Standard Deviation	33.7328
   Confidence Interval (in terms of New - Current)
   Confidence Coefficient	0.95
   Lower Limit
   Upper Limit
   Hypothesis Test (in terms of New - Current)
   Hypothesized Value
   Test Statistic
   p-value (Lower Tail)	0.0165
   p-value (Upper Tail)
   p-value (Two Tail)

   	New	Current
   Sample Size	7	7
   Sample Mean	518.2857	561.7143
   Sample Standard Deviation	38.9774	27.5058
   df	10
   Confidence Interval (in terms of New - Current)
   Confidence Coefficient	0.95
   Lower Limit
   Upper Limit
   Hypothesis Test (in terms of New - Current)
   Hypothesized Value
   Test Statistic
   p-value (Lower Tail)	0.0184
   p-value (Upper Tail)
   p-value (Two Tail)

   IBM is interested in comparing the average systems analyst project completion time using the current technology and using the new computer software package. So, a statistical consultant for IBM randomly selected 7 projects that used the current technology and 7 projects that used the new computer software package. The completion time (in hours) for each project was recorded and then entered into Excel. Assume the samples are independent and from normal populations with equal variances. Can IBM reject the hypothesis μ_New - μ_Current = 0 at α=.01? Based on this paragraph of text, use the correct excel output above to answer the following question.

   What is the 95% confidence interval for μ_Current - μ_New?

   	a.	(3.2556, 83.6016)
   	b.	None of the answers is correct
   	c.	(-10.1156, 96.9728)
   	d.	(4.1392, 82.7180)
   	e.	(-11.6559, 98.5131)

Answer 1

95 % CI is

d. (4.1424, 82.7146). PL??