Question 49
MediumOriginal questionA coaching centre claims its students score more than 70 on average in a mock test. A random sample of 25 of its students has a mean of 74 with standard deviation 10. For 24 degrees of freedom at the 5% level, the one-tailed critical value of is 1.711 and the two-tailed one is 2.064.
Which hypotheses test the coaching centre's claim?
Show the answer and explanation
CorrectNot quiteAnswer A
Correct answer: A
Explanation
The null hypothesis is the 'no better than 70' position, .
The claim of more than 70 is the alternative, , a right-tailed test.
Worth noting
The null hypothesis always carries the equals sign; the claim to be shown goes in .
- Concept
- Setting up a one-tailed test
- Typical timeTypical
- 120 s
- Your timeYours
- —
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