Inferential Statistics

I need help with a Mathematics question. All explanations and answers will be used to help me learn.

1. Given a correlation coefficient of zero, which conclusion is correct?

   		All of the choices are correct.
   		Cannot be interpreted.
   		A correlation coefficient is not proper for the data.
   		There is no relationship between the variables.

2.Two schedules for giving rest were compared—the massed schedule and the spaced schedule. Twenty observations of the spaced schedule produced a mean of 26 errors. On the massed schedule 14 observations resulted in a mean of 36 errors. An α level of .05 was adopted and an F = 4.21 was obtained. What conclusion is appropriate?

		massed practice produces fewer errors than spaced practice
		spaced practice produces fewer errors than massed practice.
		none of the choices are correct
		the null hypothesis should be retained

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