Question

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Answer 1

Answer:

Quadratic equation has equal roots then b

2

−4ac=0

Given that kx

2

−2kx+6=0

Here a=k,b=−2k and c=6

Now, (−2k)

2

−4×k×6=0

⇒4k

2

−24k=0

⇒4k(k−6)=0

⇒k=0 or k=6

hope it helps you

Step-by-step explanation:

Answer 2

Criterion validity is an estimate of the extent to which a measure agrees with a gold standard (i.e., an external criterion of the phenomenon being measured). The major problem in criterion validity testing, for questionnaire-based measures, is the general lack of gold standards.