please help:

A study was conducted to investigate the risk factors for peripheral arterial disease among persons 55 to 74 years of age.

Table E7.21 provides data on LDL cholesterol levels (mmol/L) from four different subgroups of subjects.

Table E7.21

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Group n x s

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(1) Patients with intermittent claudication 73 6.22 1.62

(2) Major asymptotic disease cases 105 5.81 1.43

(3) Minor asymptotic disease cases 240 5.77 1.24

(4) Those with no disease 1080 5.47 1.31

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1- Test to compare the three groups simultaneously.

2- Name your test and state clearly your null and alternative hypotheses and choice of test size.