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 by random digit dialing of telephone numbers. 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 can’t be Normal. (c) Yes: the SRS condition is OK and large sample sizes make the Normality condition unnecessary.
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