2 (c) Screen images are made up of units of light called pixels.
Pixels per square inch (PPI) is a measure of image quality.
The higher the pixels per square inch, the better the image quality.
N
PP12 =
A
Where: N is the number of pixels
A is the area of the screen in square inches
Liam's old screen has a PP12 value of 9800
He wants to buy a new screen with a better image quality.
Liam sees a rectangular screen that has:
a width of 101.6 cm
width: height ratio of 16:9
8.28 million pixels
He works out that this will have a better image quality than his old screen.
Is Liam correct? Show your working.
Use the conversion: 1 inch = 2.54 cm
[4 marks]​

Which statement accurately explains whether a reflection over the x-axis and a 180° rotation would map figure acb onto itself?

Through non-collinear points there is exactly one plane.

Two researchers are attempting to create a new psychotherapy protocol that more reduces panic attacks. they believe that they have succeeded and are now in the clinical trial period of their protocol's development. they are working with several cohort groups, some of which have been through the new protocol, while others have done the standard protocol currently recommended. if these researchers are interested in evaluating the difference in the percentage of test subjects who successfully decreased their panic attacks in 2 months on the new protocol versus the percentage of test subjects who successfully decreased their panic attacks in 2 months with the traditional protocol, which of the following statistical tests would be most appropriate? a. analysis of variance (anova) b. correlation c. chi-square test d. paired t-test e. independent t-test