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toluwaez
05.12.2019 •
Mathematics
Suppose that you used a 9-point rating scale and that you wanted to compare men who had an annual income over $50,000 (group 1) with men who had an annual income less than or equal to $50,000 (group 2) on their liking of a new product. if you studied 40 men in group 1 and they have a mean of 7 and a standard deviation of 2.5, while the 35 men in group 2 have a mean of 5 and a standard deviation of 1.4, what is the approximate value of t using the t-test?
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Ответ:
Step-by-step explanation:
1) Data given and notation
t would represent the statistic (variable of interest)
2) Concepts and formulas to use
We need to conduct a hypothesis in order to check if the means are equal, the system of hypothesis would be:
H0:![\mu_{1}=\mu_{2}](/tpl/images/0404/9317/bbed8.png)
H1:![\mu_{1} \neq \mu_{2}](/tpl/images/0404/9317/1a84b.png)
If we analyze the size for the samples both are higher than 30, but we don't know the population deviation, so for this case is better apply a t test to compare means, and the statistic is given by:
t-test: Is used to compare group means. Is one of the most common tests and is used to determine whether the means of two groups are equal to each other.
In order to calculate the mean and the sample deviation we can use the following formulas:
3) Calculate the statistic
We have all in order to replace in formula (1) like this:
Ответ:
A.)
Step-by-step explanation: