Necessary sample size for a given level of confidence

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Reference no: EM1320929

To find the necessary sample size for a given level of confidence and accuracy of measurement.

My mgr needs information. I need to determine if a new product is worth marketing. At least 85 percent of the public must express interest in the product and for those that do the average cost they are willing to pay must be at least $47.50.

I survey 50 potential consumers regarding their interest in the product, 34 express an interest in purchasing it. The maximum price each would be willing to pay is shown below.

Maximum Prices

47

62

46

43

53

34

54

45

35

65

36

32

54

45

31

34

36

25

38

37

56

35

43

65

43

48

54

37

46

65

54

42

47

63

 

 

How large should the sample be if I want to maintain a 95 percent level of confidence and suffer a maximum error of $2.00 in my estimate of the highest price consumers are willing to pay?

Reference no: EM1320929

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