John investigated the effect of odour on attitude formation. He hypothesised that viewing artwork while being exposed to an unpleasant odour would decrease one's liking of the artwork relative to viewing the same piece of art in the absence of a noticeable odour. John measured how much people liked the artwork on a 0-100 scale (0 = dislike, 100 = like). The average score for the odour group was 58 (sd = 26). The average score for the control group was 39 (sd = 17). After seeing these results, John concluded that odours improve people's attitudes towards artwork. Which of the following statements is correct?

1. John is making the correct decision about the null hypothesis.

2. John is making a Type I error, and he should reject the null hypothesis.

3. John is making a Type I error, and he should fail to reject the null hypothesis.

4. John is making a Type II error, and he should reject the null hypothesis.

5. John is making a Type II error, and he should fail to reject the null hypothesis.