A student believes that the average grade on the final examination in statistics is at least 85. She plans on taking a sample to test her belief. The correct set of hypotheses is ____________________________.

Exhibit 2-4A survey of 400 college seniors resulted in the following crosstabulation regarding their undergraduate major and whether or not they plan to go to graduate school.     Undergraduate Major     Graduate School Business Engineering Others Total   Yes   35   42   63 140   No   91 104   65 260   Total 126 146 128 400 Refer to Exhibit 2-4. What percentage of the students plan to go to graduate school?

If a hypothesis test leads to the rejection of the null hypothesis, a _______________________________________________________.

As the sample size increases, the margin of error _______________________.

The average life expectancy of tires produced by the Whitney Tire Company has been 40,000 miles. Management believes that due to a new production process, the life expectancy of its tires has increased. In order to test the validity of this belief, the correct set of hypotheses is ____________________________________________.

The function that defines the probability distribution of any continuous random variable is a ____________________________.

An example of statistical inference is _________________________________.

Z is a standard normal random variable. The P(1.20 ≤ z ≤ 1.85) equals ______________. z dsistribution table from 0.0 to 2.49.jpg

The z value for a 97.8% confidence interval estimation is __________. z dsistribution table from 0.0 to 2.49.jpg

When constructing a confidence or a prediction interval to quantify the relationship between two quantitative variables, what distribution do confidence and prediction intervals follow?