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Lorico [155]
3 years ago
14

A research firm supplies manufacturers with estimates of the sales of their products from samples of stores. Marketing managers

often look at the sales estimates and ignore sampling error. An SRS of 50 stores this month shows mean sales of 41 units of a particular appliance with a standard deviation of 11 units. During the same month last year, an SRS of 52 stores gave mean sales of 38 units of the same appliances with a standard deviation of 13 units. An increase from 38 to 41 is a rise of 7.9 % . The marketing manager is happy because sales are up 7.9 % . (a) Give a 95 % confidence interval for the difference in mean number of units of the appliance sold at all retail stores. (Enter your answer rounded to three decimal places.)
Mathematics
1 answer:
Alchen [17]3 years ago
4 0

Answer:

lower interval = -1.715

upper interval = 7.715

Step-by-step explanation:

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The common ratio of the given geometric sequence is the number that is multiplied to the first term in order to get the second term. Consequently, this is also the number multiplied to the second term to get the third term. This cycle goes on and on until a certain term is acquired. In this item, the common ratio r is,

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The answers for the next three terms are as reflected above as n₄, n₅, and n₆, respectively. 
3 0
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