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6 April, 17:39

Majesty Video Production Inc. wants the mean length of its advertisements to be 30 seconds. Assume the distribution of ad length follows the normal distribution with a population standard deviation of 2 seconds. Suppose we select a sample of 16 ads produced by Majesty. What can we say about the shape of the distribution of the sample mean time

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  1. 6 April, 19:14
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    Step-by-step explanation:

    Given that Majesty Video Production Inc. wants the mean length of its advertisements to be 30 seconds

    Let X be the mean length of advts.

    X is N (30, 2)

    n = 16

    Std error of sample = 2/sqrt 16 = 0.5

    The sample mean also will be normal with mean - 30 and std dev = 0.5

    So bell shaped symmetrical and uni modal
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