Question

Heart rate measurements taken on the left and right arms of a person are assumed to be comparable. 10 volunteers are obtained and readings are taken simultaneously on both arms. Using a significance level of 0.05 and ? = ? − ?, test if there is a mean difference in heart rate.

Volunteer	1	2	3	4	5	6	7	8	9	10
Left Arm	130	120	135	100	98	110	123	136	140	155
Right Arm	126	124	127	95	102	109	124	132	137	156

Construct a 95% Confidence Interval for the difference in mean BP readings. Interpret your results

Answer 1

We construct the following table:

Patient	L	R	d=L-R
1	130	126	4
2	120	124	-4
3	135	127	8
4	100	95	5
5	98	102	-4
6	110	109	1
7	123	124	-1
8	136	132	4
9	140	137	3
10	155	156	-1

The 95% Confidence Interval for mean is given by


Computation




Putting in the values, we get the 95% Confidence Interval as:

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