Table 5.15 presents the ages for a number of individuals.

- Calculate the following statistics for the variable
**Age**:- Mode
- Median
- Mean
Name Age P.Lee 35 R.Jones 52 J.Smith 45 A.Patel 70 M.Owen 24 S.Green 43 N.Cook 68 W.Hands 77 P.Rice 45 F.Marsh 28 - Range
- Variance
- Standard deviation
*z-score*- Skewness
- Kurtosis

- An insurance company wanted to understand the time to process an insurance claim. They timed a random sample of 47 claims and determined that it took on average 25 minutes per claim and the standard deviation was calculated to be 3. With a confidence level of 95%, what is the confidence interval?
- An electronics company wishes to understand, for all customers that purchased a computer, how many will buy a printer at the same time. To test this, the company interviews a random sample of 300 customers and it was determined that 138 bought a printer. With a confidence level of 99%, what is the confidence interval for the proportion of customers buying a printer at the same time as a computer?
- A phone company wishes to make a claim that the average connection time in the US is less than two seconds (i.e. the time after you dial a number before the call starts to ring). To test this, the company measures 50 randomly selected calls and the average time was 1.9 seconds with a standard deviation of 0.26. Using this information and a 95% confidence level:
- Specify the null and alternative hypothesis ...

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