Question

Write a research hypothesis for which the independent samples t-test will be appropriate. Clearly identify the independent and dependent variables, and two potential confounding factors.

Answer 1

Here in independent sample t- test the appropriate research hypothesis and Null hypothesis is given below,

Null and research (Alternative) Hypotheses
For comparing two means, the basic null hypothesis is that the means are equal,
?0: ?1 = ?2
with three common research hypotheses,
??: ?1 ≠ ?2 ,
??: ?1 < ?2 , or
??: ?1 > ?2 ,
one of which is chosen according to the nature of the experiment or study.
A slightly different set of null and alternative hypotheses are used if the goal of the test is to determine whether ?1
or ?2 is greater than or less than the other by a given amount.
The null hypothesis then takes on the form
?0: ?1 − ?2 = Hypothesized Difference

The Research hypotheses,
??: ?1 − ?2 ≠ Hypothesized Difference
??: ?1 − ?2 < Hypothesized Difference
H?: ?1 − ?2 > Hypothesized Difference
These hypotheses are equivalent to the previous set if the Hypothesized Difference is zero

Now the confounding factors in t test,

A Confounder is a variable whose presence affects the variables being studied so that the results do not reflect the actual relationship. There are various ways to exclude or control confounding variables including Randomization, Restriction and Matching.

Hope you understood then RATE POSITIVE ?. In case of any queries please feel free to ask in comment box.

Thank you.