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?\nno, because the sample size was not big enough.\nno, because she did not use a simple random sample.\nyes, because the sample size was big enough.\nyes, because she used a simple random sample.

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?\nno, because the sample size was not big enough.\nno, because she did not use a simple random sample.\nyes, because the sample size was big enough.\nyes, because she used a simple random sample.

Answer

Brief Explanations:

To make an inference about the population mean, the sample should be a simple random sample. Beth surveyed only her fellow intramural tennis players (a non - random, specific group within tenth - grade girls). A sample size of 20 can be considered sufficient in some cases for normal distributions, but the non - random nature of the sample is the key issue.

Answer:

No, because she did not use a simple random sample.