Unit 3 HW

# Q 2c what is the length of a call if only 1 of all

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(Round to three decimals.) Q-2c: What is the length of a call if only 1% of all calls are shorter? (Round to one decimal.)

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The amount of time it takes to take your order at the local Whaters restaurant has a population mean μ of 3.1 minutes and a standard deviation σ of 0.40 minutes. If you select a random sample of 16 customers: Q-3a: What is the probability that the mean time spent per customer is at least 3 minutes?
Model MPG Honda Civic 31 Hyundai Elantra XE 27 Mazda 3 27 Honda Civic Ex 28 Kia Rio LX 28 Hyundai Accent 28 Kia Spectra EX 25 Mitsubishi Lancer 25 Nissan Sentra 26 Kia Spectra EX 25 Toyota Yaris 33 Chevrolet Cobalt 23 Suzuki Forenza 24 The data at left come from a sample of the overall miles per gallon (MPG) of 2008 sedans priced under \$20,000. Q-4a: Construct a 95% confidence interval estimate for the population mean MPG of 2008 sedans under \$20,000. (Round to one decimal place.)

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The cellular spinoff company Jog wants to estimate the proportion of households that would purchase an additional cellular line if it were made available with a free handset. A random sample of 500 accounts is selected. The results indicate that 135 of the accounts would purchase an additional line if the handset was free. Q-5a: Construct a 99% confidence interval estimate of the population proportion of accounts that would purchase the additional line if the handset were free.

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