Need immediate help multiple-choice questions!! (intro to statistics)

1) Determine whether the sampling method described below appears to be sound or is flawed.

In a survey of 541 subjects, the following question was posted on anewspaper's website: "In yourview, are nuclear plantssafe?" The survey subjects were Internet users who chose to respond to the question posted on the electronic edition of the newspaper.

Choose the correct answer below.

A. It is flawed because it is not statistically significant.

B. It is flawed because it is a census.

C. It is flawed because it is a voluntary response sample.

D. It appears to be sound because the data are not biased in any way.

2) Determine whether the results below appear to have statistical significance, and also determine whether the results have practical significance.

In a study of a weight loss program,7 subjects lost an average of42 lbs. It is found that there is about a 32% chance of getting such results with a diet that has no effect.

i) Does the weight loss program have statisticalsignificance?

A. No, the program is not statistically significant because the results are likely to occur by chance.

B. No, the program is not statistically significant because the results are unlikely to occur by chance.

C. Yes, the program is statistically significant because the results are likely to occur by chance.

D. Yes, the program is statistically significant because the results are unlikely to occur by chance.

ii) Does the weight loss program have practicalsignificance?

A. Yes, the program is practically significant because the results are too unlikely to occur by chance.

B. Yes, the program is practically significant because the amount of lost weight is large enough to be considered practically significant.

C. No, the program is not practically significant because the results are likely to occur even if the weight loss program has no effect.

D. No, the program is not practically significant because the amount of weight lost is trivial.