Find confidence interval for the mean percentage investment

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Reference no: EM131384568

Percentage investment in new-product development is monitored for a pharmaceutical company by quarter. The observations are listed row wise:

32.9	31.5	34.3	36.8	35.0
29.4	33.2	37.8	35.0	32.7
28.5	30.4	32.6	31.5	30.6
35.8	36.4	34.2	35.0	33.5
31.8	32.5	28.4	33.8	35.1
30.2	33.0	34.6	32.4	32.0

(a) Can we conclude that the sequence of investment percentages is random? Use α= 0.05.

(b) Is there clustering? Is there a trend? Use α = 0.05.

(d) Find a 98% confidence interval for the mean percentage investment.

(e) Find a 98% confidence interval for the standard deviation of the percentage investment.

(f) Can we conclude that the mean percentage investment in new products exceeds 31%? Use α = 0.01. What is the p-value? Explain.

Reference no: EM131384568

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