10. A study is conducted to determine if the blue light from a tablet device will
affect the fall asleep time of people in various age groups differently. Volunteers
for the study are grouped by age: 18-30, 31-50, and 50+. Half of each group is
assigned a standard tablet, the other half is assigned a tablet with reduced blue
light. People in each group are asked to use the tablet for 10 minutes before bed
and their fall asleep time is recorded. Which of the following is correct?
(A) Blocks: the three age groups. Treatments: using the standard tablet or the reduced
blue light tablet before bed. Response variable: How the eyes react to blue light.

(D) Blocks: the three age groups. Treatments: using the standard tablet or the reduced blue light tablet before bed. Response variable: Time it takes to fall asleep.

Step-by-step explanation:

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astha8579 astha8579 · Answer 2 · 2022-04-18T07:29:23+02:00

The block, treatment and response variable are correctly specified by Option D, as shown below.

What are explanatory and response variables?

Explanatory variables are also called independent variables and they explain variations in the response variables. They are not dependent on any directly considered variable in the considered situation.

The response variables are also called dependent variables and their values depend on the values of the explanatory variables.

What are blocks and treatments?

Blocking is the arranging of experimental units in groups (also called blocks) that are similar to one another.

Treatments are applied to experimental units in a treatment group.

Here, we're trying to find out the effects of blue light from screens on the time it takes to fall asleep.

Thus, the response variable is the response it recieves (in terms of time it takes to fall asleep) when there is more blue light and less blue light.

The problem is missing all options which are as follows:

a. Blocks: the three age groups. Treatments: using the standard tablet or the reduced blue light tablet before bed. Response variable: How the eyes react to blue light.
b. Blocks: the three age groups. Treatments: measuring how long it takes to fall asleep. Response variable: The hours of sleep recorded.
c. Strata: the three age groups. Treatments: using the standard tablet or the reduced blue light tablet before bed. Response variable: How the eyes react to blue light.
d. Blocks: the three age groups. Treatments: using the standard tablet or the reduced blue light tablet before bed. Response variable: Time it takes to fall asleep.
e. Blocks: the group receiving the standard tablet and the group receiving the reduced blue light tablet. Treatments: using the standard tablet or the reduced blue light tablet before bed. Response variable: Time it takes to fall asleep.

From these options, only option d and e identify the correct response variable.

The experimental units (the volunteers) were arranged in groups of three (depending on ages). Thus, blocks are the three age groups.

This is correctly identified only by Option D.

Thus, the block, treatment and response variables are given correctly by: Option D: Blocks: the three age groups. Treatments: using the standard tablet or the reduced blue light tablet before bed. Response variable: time it takes to fall asleep

Learn more about blocking here:

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