Question

A study of the use of social media asked a sample of 488 American adults under the age of 40 and a sample of 421 American adults aged 40 or over about their use of social media. Based on their answers, each subject was assigned a social media usage score on a scale of 0 to 25. Higher scores indicate greater usage. The subjects were chosen at random. Are the conditions for two-sample t inference satisfied?

a. Maybe: the SRS condition is OK but we need to look at the data to check Normality
b. No: scores in a range between 0 and 25 cant be Normal
c. Yes: the STS condition is OK and large sample sized makes the Normality condition unnecessary.

Answer 1

a

Explanation:

Maybe: the SRS condition is OK but we need to look at the data to check Normality.

The normality inference is important in that the null compares the difference in the sample means to the difference that one would expect by random variation, or by chance, alone meaning that the sample is assumed to have being from a normal distribution with a mean and standards deviation.