What is it called when one rejects the null hypothesis and accepts the alternative, when in fact the null hypothesis is true?

 i)A 'longitudinal' survey is one where the same set of respondents complete the same survey on two or more occasions.

ii)A 'cross-sectional' survey is one where the same set of respondents complete different surveys on two or more occasions.

Which of the following statements is/are true?

 i)A 'longitudinal' survey is one where the same set of respondents complete the same survey on two or more occasions.

ii)A 'cross-sectional' survey is one where the same set of respondents complete different surveys on two or more occasions.

i)Existing contracts held by the company

ii)Redundancy costs

iii)Equipment that cannot be sold or reconfigured

Which of the following is/are typical 'barriers to entry'?

i)Existing contracts held by the company

ii)Redundancy costs

iii)Equipment that cannot be sold or reconfigured