Which of the following examples involves paired data? I. A study compared the av

Question

Which of the following examples involves paired data? I. A study compared the average number of flowers on a random sample of 100 plants in the largest U.S. rose garden with the average number of flowers on a random sample of 100 rose bushes in the largest European rose garden Il. A group of 100 car drivers was randomly split into two groups of 50 drivers. One group always drove with the radio on. The other group always drove with the radio off. The groups were tracked for one year and the proportions with accidents were compared. A group o 50 students had their blood pressures measured before and after watching a move containing violence. The mean blood pressure before the movie was compared with the mean pressure after the movie. A I only B II and lll only O C only O D. 11 only

Explanation / Answer

we want to find the paired data

Paired t test has following assumptions

1 ) The data are continuous

2 ) The data i.e. difference between matched pairs follows the normal distribution

3 ) The sample of pairs is a simple random sample from its population

In paired t test each subject receives two treatments in befor and after format

So , in example 3 ) The blood pressure is measured befor and after watching the movie of each student

So , this is the example of paired data

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