1. Which of the following serves best as a null hypothesis? a) Plants receiving
ID: 2935392 • Letter: 1
Question
1. Which of the following serves best as a null hypothesis?
a) Plants receiving fertiliser produce more fruit
b) Fertiliser improves fruit quality
c) Plants receiving fertiliser do not produce more fruit
d) Fertiliser is good for plants
2. A p-value...
A. of a test is always higher than the power.
B. can be higher than 1 / higher than 100%.
C. can be negative.
D. none of the above are correct.
3. A t-test tests...
A. whether two variables are correlated.
B. for a significant difference between two groups.
C. for a significant difference between several groups.
D. whether the variance of the residuals is normal.
Can someone help please. Thank you
Explanation / Answer
1.
Option (a) gives the proper statement for null hypothesis.
Here the output i.e. the number of fruits can actually be quanitfied and tested according to null hypothesis.
Hence correct answer is a) Plants receiving fertiliser produce more fruit
2. None of the above are correct.
The power of a hypothesis test is the probability of rejecting the null hypothesis H0 when the alternative hypothesis HA is the hypothesis that is true. We can not actually relate this with p-value.
3. A t-test tests for a significant difference between two groups.
This is well known test of two means with unknown/known variances.
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