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Problem regarding the customer satisfaction

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Reference no: EM131042226

1) A manufacturing company wishes to estimate the number of items that its workforce can produce on average each hour now that they have a new machine. The factory examined the records for a random sample of 8 hours over the past month. The hourly production rates for these 8 hours were:

142     175     162     158     190     154     160     185

(a) Calculate by hand and interpret the 99 percent confidence interval for the average number of items produced per hour.

(b)What assumption did you make in order to answer part (a)?

Question 2 Customer Satisfaction

  1. An insurance company wants to estimate the proportion of people unsatisfied with their new telephone help service. A survey of 200 callers revealed 45 were unsatisfied with the service. Construct by hand a 95% confidence interval for the proportion of unsatisfied customers.
  2. If the company wanted to estimate the sample proportion to within 2% of the population proportion, what sample size would be necessary assuming no prior estimate of the proportion is known?

Reference no: EM131042226

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