A Consumer Group Would Like to Estimate the Mean Monthly

question 9

Multiple Choice

A consumer group would like to estimate the mean monthly electricity charge for a single family
House in July (within $5) using a 99 percent level of confidence. Based on similar studies the
Standard deviation is estimated to be $20.00. How large a sample is required?

• A) 105
• B) 106
• C) 107
• D) 108
• E) 109

Calculate and interpret the p-value in hypothesis testing.

Apply statistical methods to evaluate differences in opinions or behaviors between two groups.

Use interval estimates for hypothesis testing and interpretation of results.

Understand the significance of confidence levels in the context of statistical inference.