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, because the sample size was not big enough.
no, because she did not use a simple random sample.
yes, because the sample size was big enough.
yes, because she used a simple random sample.

Answer with explanation:

→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.

I think she can't make an inference about the population mean for all tenth-grade girls based on the sample.The reason is that exact total population of class tenth girl is not given.

And, in all the four option given,the word "Sample size" has been used ,but Exact Population is not given.

All the Options are Incorrect.

1. 3. can also be expressed as (22/7)

2. -4.5

3. 3.6

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