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19 November, 13:18

Refer to the Current Allergy & Clinical Immunology (March 2004) study of latex allergy in health care workers. There is a claim that the mean number of latex gloves used per day by all hospital employees is less than 20 gloves. A sample of 46 were selected with a mean number of latex gloves used per day by all hospital employees of 19.3 and standard deviation of 11.9. Assume alpha is 0.01.

What is the rejection region?

a. z<-2.575

b. z<-2.33

c. z >2.575

d. z>2.33

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  1. 19 November, 15:35
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    c. z >2.575

    Step-by-step explanation:

    Sample Mean (M) : = 19.3

    Sample Size (n) : = 46

    Standard Deviation (s) : = 11.9

    Confidence Level:1-a=1-0.01=0.99

    Calculation

    M = 19.3

    Z = 2.58

    sM = √ (11.92/46) = 1.75

    μ = M ± Z (sM)

    μ = 19.3 ± 2.58*1.75

    μ = 19.3 ± 4.519

    Result

    M = 19.3, 99% CI [14.781, 23.819].

    You can be 99% confident that the population mean (μ) falls between 14.781 and 23.819.

    The rejection region is Z>2.575
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