Use a two-tail t-test with a significance level of 10% to examine whether the mean score is significantly different from zero.

Student Number	Score
1	90
2	60
3	80
4	70
5	50

Computed t-value:

Critical t-value

Conclusion

2. Use a one-tail t-test with a significance level of 10% to examine whether the mean score is significantly higher than eighty.

Computed t-value:

Critical t-value:

Conclusion: