Which of the following is the researcher usually interested in supporting when he or she is engaging in hypothesis testing?

Which of the following is the researcher usually interested in supporting when he or she is engaging in hypothesis testing?
1). The alternative hypothesis
2). The null hypothesis
3). Both the alternative and null hypothesis
4). Neither the alternative or null hypothesis

The alternative hypothesis : - option 1

• In an alloy, zinc and copper are in the ratio 1 : 2. In the second alloy, the same elements are in the ratio 2 : 3. If these two alloys be mixed to form a new alloy in which two elements are in the ratio 5:8, the ratio of these two alloys in the new allow
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• X and Y are two alloys which are prepared by mixing zinc and aluminium in the ratio of 1 : 4 and 11 : 8 respectively. If equal quantities of alloys are melted to form a third alloy Z then what is the ratio of zinc and aluminium in alloy Z?