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- From Mathematics, Statistics
- Due on 22 Feb, 2015 11:59:00
- Asked On 17 Feb, 2015 12:47:33
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- Irina
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Use Table (http://www.itl.nist.gov/div898/handbook/eda/section3/eda3671.htm) to find the proportion of the normal curve that is

1) Between a z-score of .60 and the mean

2) Between a z-score of 1.60 and the mean

3) At or above a z-score of 1.30

4) At or below a z-score of 1.30

5) At or below a z-score of -1.00

6) At or above a z-score of -1.00

7) Between the z-scores of -1.00 and .60

8) Between the z-scores of -1.50 and .65

9) Between the z-scores of -1.96 and .25

Part II

1. What percentage of a normal distribution is within 2 standard deviations of the mean? (Select the closest answer)

The lengths of time bank customers must wait for a teller are normally distributed, with a mean of 3 minutes and a standard deviation of 1 minute.

2. What proportion of bank customers waits between 2 and 3.5 minutes

•a. What percentage wait more than 4 minutes?

•b. What proportion waits between 1 and 2.5 minutes?

•c. What percentage wait less than 1 minute?

3. To estimate the medical charges for an appendectomy Blue Star Insurance has data from a random sample of 70 patients. The sample mean cost is $510, with a sample standard deviation of $70

Construct a 95% confidence interval for the population mean cost.

4. We are 95% confident that the populations mean costs of patients’ medical charges for an appendectomy through Blue Star Insurance range is between _____________ and ________________.

A real estate agent records the ages of 50 randomly selected home buyers in her sales area. The mean age is 38 years, with a sample standard deviation of 10 years.

Find a 99% confidence interval for the mean age.

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