State the requirements to perform a goodness-of-fit test. Choose the correct answer below. Select all that apply. A. at least 90% of expected frequencies greater than or equals10 B. at least 80% of expected frequencies greater than or equals10 C. all expected frequenciesgreater than or equals5 D. at least 80% of expected frequencies greater than or equals5 E. at least 90% of expected frequencies greater than or equals5 F. all expected frequenciesgreater than or equals1

C. all expected frequencies is greater than or equals5

Explanation: The goodness of fit test is mainly used to test if sample data fits a distribution from a certain population.

The expected value for each cell needs to be at least five in order for you to use this test, Not less than 5, but greater than 5. Which is why option C is correct for performing a goodness-of-fit test.

Other requirements includes;

• The sampling method is a simple random sampling.

• The variable under study is categorical.

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.