the number of sit - ups that all tenth - grade girls can do in 5 minutes is normally distributed. beth…
the number of sit - ups that all tenth - grade girls can do in 5 minutes is normally distributed. beth surveyed 20 of her fellow intramural tennis players, all tenth - grade girls, and determined the mean number of sit - ups they could do. can she make an inference about the population mean for all tenth - grade girls based on the sample?\no no, because the sample size was not big enough.\no no, because she did not use a simple random sample.\no yes, because the sample size was big enough.\no yes, because she used a simple random sample.
Answer
Brief Explanations:
To make a valid inference about a population mean, the sample should be a simple - random sample. Beth surveyed her fellow intramural tennis players, which is a convenience sample, not a simple - random sample. So, she cannot make a valid inference about the population mean for all tenth - grade girls.
Answer:
No, because she did not use a simple random sample.