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    Koi's Yummy Burgers delivery times

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    Koi's Yummy Burgers claims that 90% of its orders are delivered within 10 minutes of the time the order is placed. A sample of 100 orders revealed that 82 were delivered within the promised time. At the .05 significance level, can we conclude that 90% of the orders are delivered in less than 10 minutes?

    43. What test is most appropriate for this problem?
    A. Z-test of means
    B. Z-test of proportions
    C. T-test
    D. Chi-square - goodness of fit
    E. Chi-square - test of independence
    F. ANOVA - single factor

    44. What is the null hypothesis?
    A. H0: π = .9
    B. H0: π ≠ .9
    C. H0: π ≥ .9
    D. H0: π ≤ .9
    E. H0: μ1 = μ2

    45. What is your decision?
    A. Ho is accepted. More than 90% of the customers receive their orders in less than 10 minutes.
    B. Ho is accepted. More than 90% of the customers receive their orders in more than 10 minutes.
    C. Ho is rejected. More than 90% of the customers receive their orders in less than 10 minutes.
    D. Ho is rejected. More than 90% of the customers receive their orders in more than 10 minutes.
    E. Something else.

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    https://brainmass.com/statistics/hypothesis-testing/koi-s-yummy-burgers-delivery-times-280157

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