Write short answers to the following (a) What is meant by the a;.level used in h
ID: 3237877 • Letter: W
Question
Write short answers to the following (a) What is meant by the a;.level used in hypothesis testing? (b) A Pearson correlation has more stringent assumptions about the data than does a Spearman correlation and so can be used validly in fewer situations. List those assumptions. Why should we bother using the Pearson correlation at ali? (c) in a factorial experiment, what is meant by interaction between two factors? (d) How does significance/non-significance of the interaction affect the other hypothesis tests you might do? e. Is it always be advantageous to include a blocking factor in field trials? Q2. A researcher is assessing consumer reaction to new flavour of drink, Chilli Coke. Preference for the original (Coke Classic) and the new (Chilli Coke) flavours were tested on 30 people in a focus group. Each person was given an unlabelled glass of each (in a random order) and asked to state which they preferred. (a) What test should you use to test the null hypothesis that there was no difference in preference for the two flavours? (b) If the members of the focus group in part (c) were asked to score each flavour on a 1 to 10 scale, which test would you use to test the same null hypothesis (c) If a colleague suggested that it was not necessary to randomise the order in· which each person tasted the drinks, outline the argument with which you would answer him?
Explanation / Answer
Q1.a)
Alpha level of significance in the hypothesis is nothing but the probability of falsely rejecting the null hypothesis when it is true.
b) The assumptions for pearson correlations are: i)The data should be paired.
ii) Variable should be normally distributed.
iii)each variable should be continuous.
iv) There should be no outliers.
c) the combined effects of two factors on the dependent measure is called interaction effect. It is to be considered when the main effect can not predicts the response.
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