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Chapter 8: Q 13. (page 507)

Household income The 2015American Community Survey estimated the median

household income for each state. According to ACS, the 90%confidence interval for the 2015median household income in Arizona is \(51,492±\)431.

a. Interpret the confidence interval.

b. Interpret the confidence level.

Short Answer

Expert verified

a. There is 90%assurance that income in Arizona fall between $51061and$51923

b. It is used for the calculation of value of level of significance

Step by step solution

01

Given Information

The confidence interval is given as51,492±431=(51061,51923)for90%.

02

To interpret Confidence Interval

Confidence Interval is calculated as 51,492±431=(51061,51923)

It implies that there is 90%assurance that Arizona's median household income falls between$51061and$51923.

03

Interpreting Confidence Level

  • It gives the probability for values that expects to calculate population parameter.
  • It is used for the calculation of value of level of significanceα.

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