6.2 Confidence Intervals

Front

Margin of Error is equal to:

Back

2 * Standard Deviation

Front

True or False: The more confident you want to be, the smaller your confidence interval will be.

Back

False

Front

Which changes to a study result in a smaller confidence interval?

Back

decreasing the confidence level, increasing the sample size.

Front

Which z-value is used for a 95% confidence interval?

Back

1.96

Front

The amount added and subtracted to the statistic.

Back

Margin of Error

Front

What is the margin of error for the interval (6.8, 12.9)?

Back

3.05

Front

The height of women is normally distributed with an average height of 64 inches and a standard deviation of 2.5 inches. What interval contains 99.7% of all data?

Back

56.5 to 71.5

Front

Identify the confidence interval used in the figure below if each shaded area is equal to 0.05.

Back

90%

Front

A research company wants to estimate the proportion of people who like oatmeal with a 95% confidence level. 325 people signed up, but only 250 took the survey. What happens to the confidence interval?

Back

It gets larger

Front

Is it likely that the true population mean µ is greater than 130 if the 95% Confidence Interval for a population mean is (114.56, 125.54)?

Back

No