The proper operation of typical home appliances requires voltage levels that do not vary much. Listed below are 6 voltage levels (in volts) at a random house on 6 different days. 120 120 119.8 120 119.9 119.9 The mean of the data set is 119.9; the sample standard deviation is 0.08; if the normality plot is not provided you may assume that the voltages are normally distributed. Construct a 95% confidence interval for the variance (standard deviation) of all voltages in the house. Procedure: Select an answer: a. One mean Z procedure b. One proportion c. Z procedure One variance χ² procedure d. One mean T procedure 2. Assumptions: (select everything that applies) a. Simple random sample b. Normal population c. The sample size is greater than 30 d. The number of positive and negative responses are both greater than 10 e. Population standard deviation is known f. Population standard deviation is unknown 3, Unknown parameter: Select an answer a. σ², population variance p, b. population proportion μ, c. population mean
The proper operation of typical home appliances requires voltage levels that do not vary much. Listed below are 6 voltage levels (in volts) at a random house on 6 different days.
120 | 120 | 119.8 | 120 | 119.9 |
119.9 |
The
Construct a 95% confidence interval for the variance (standard deviation) of all voltages in the house.
- Procedure: Select an answer:
a. One mean Z procedure
b. One proportion
c. Z procedure One variance χ² procedure
d. One mean T procedure
2. Assumptions: (select everything that applies)
- a. Simple random sample
- b. Normal population
- c. The sample size is greater than 30
- d. The number of positive and negative responses are both greater than 10
- e. Population standard deviation is known
- f. Population standard deviation is unknown
3, Unknown parameter: Select an answer
a. σ², population variance p,
b. population proportion μ,
c. population mean
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