The manager of a department store wants to determine the proportion of customers who use the store’s credit card when making a purchase. Wha

Question

The manager of a department store wants to determine the proportion of customers who use the store’s credit card when making a purchase. What sample size should he select so that at 96% confidence the error will not be more than 10%?

a. 106
b. 76
c. 1
d. There is not enough information given to determine the sample size

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Allison 4 months 2021-10-08T14:42:01+00:00 1 Answer 0 views 0

Answers ( )

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    2021-10-08T14:43:37+00:00

    Answer:

    Option A) 106  

    Step-by-step explanation:

    We are given the following in the question:

    Confidence level = 96%

    Margin of error = 10%

    Formula:

    Sample size, n =

    n  = \dfrac{z^2p(1-p) }{E^2}

    z_{critical} \text{ at 0.04 level of significance } = 2.05  

    Since, we are not given any proportion, we take

    p = 0.5

    Putting all the value, we get,

    n  = \dfrac{(2.05)^2(0.5)(1-0.5) }{(0.10)^2}\\\\n = 105.0625\\n \approx 106

    Thus, the correct answer is

    Option A) 106

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45:7+7-4:2-5:5*4+35:2 =? ( )