7.42 Null hypotheses and research hypotheses: For each of the following examples

Question

7.42 Null hypotheses and research hypotheses: For each of the following examples (the same as those in Exercise 7.41), state the null hypothesis and the research hypothesis, in both words and symbolic notation:

        A researcher is interested in studying the relation between the use of antibacterial products and the dryness of people’s skin. He thinks these products might alter the moisture in skin differently from other products that are not antibacterial.

        A student wonders if grades in a class are in any way related to where a student sits in the classroom. In particular, do students who sit in the front row get better grades, on average, than the general population of students?

        Cell phones are everywhere, and we are now available by phone almost all of the time. Does this translate into a change in the closeness of our longdistance relationships?

Explanation / Answer

A researcher is interested in studying the relation between the use of antibacterialproducts and the dryness of people’s skin.He thinks these products might alterthe moisture in skin differently from other products that are not antibacterial.

Null hypothesis: The moisture in the skin would be the same whether you use an anti-bacterial product or a not antibacterial product Ho: M1= M2

Research hypothesis: The moisture in the skin would be the different whether you use an anti-bacterial product or a not antibacterial product Ha: M1 M2

A student wonders if grades in a class are in any way related to where a student sits in the classroom. In particular, do students who sit in the front row get better grades, on average, than the general population of students

Null hypothesis: The students who sit in the front row can not get a better score then the general population who doesn’t sit in the front. Ho: M1 M2

Research hypothesis: The students who sit in the front row can get a better score then the general population who doesn’t sit in the front. Ha: M1< M2

Cell phones are everywhere, and we are now available by phone almost all of the time. Does this translate into a change in the closeness of our longdistance relationships

Null hypothesis: Long-distances relationships will does not differ from short-distance relationship in terms of closeness even with a use of a cellphone Ho: M1= M2

Research hypothesis: Long-distances relationships will differ from short-distance relationship in terms of closeness even with a use of a cellphone   Ha: M1 M2

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