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Write the null and alternative hypotheses. Justify which is the claim. A light bulb manufacturer guarantees that the mean life of a certain type of light bulb is less than 900 hours

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    The claim: mean < 900
    other option: mean > or = 900

    The null hypothesis is the one with an equal sign...

    Your null hypothesis would be mean=900
    Your alt. hypothesis would be mean<900

    The alt. hypothesis is the claim.

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