Forums Homework Help Assume nappy usage is normally distributed with a standard deviation of 2

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    ahwriter
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    a) In planning both market opportunity and production levels, being able to estimate the size of a market can be important. Suppose a manufacturer of nappies wishes to determine how many nappies a one-month old baby uses during a 24-hour period. The manufacturer randomly selected 50 parents of one-month old babies and found, on average, 11 nappies were used in a 24-hour period. Construct at 99% confidence interval to estimate the average daily nappy usage of a one-month old baby. Assume nappy usage is normally distributed with a standard deviation of 2.

    b) A study by researchers at a Taiwanese university attempted to determine whether there is a significant difference in the purchasing strategies of industrial buyers in the two countries based on the cultural dimension labelled ‘integration’ (being in harmony with one’s self, family and associates). Buyers were asked to respond to 35 items using a 9 point scale with possible answers ranging from no importance (1) to extreme importance (9). Using  = 0.01 and the data given in the table below determine whether there is a significant difference between buyers of the two counties on integration. The populations from which the two samples are drawn are assumed to be normally distributed with equal variances for the phenomenon being measured.

    Integration

    Taiwanese buyers Mainland Chinese buyers

    n1 = 46 n2 = 26

    1 = 5.42

    2 = 5.04

    s1 = 0.58 s2 = 0.49

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